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Maize silage


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Common names 

Maize silage, corn silage, baby corn silage [English]; ensilage de maïs, maïs ensilage [French]; ensilaje de maiz [Spanish]; silagem do milho [Portuguese]

Related feed(s) 

Maize silage (Zea mays L.) is made out of whole ensiled maize plants. It is one of the most valuable forages for ruminant livestock and it is used wherever maize can grow, from temperate regions to the tropics. The popularity of maize silage is due to several factors. It is a consistent source of palatable and high-energy forage for all classes of ruminants, including dairy cattle, beef cattle, sheep and goats (Roth et al., 2001). It is one of the most high-yielding forage crops, requires less labour (since it is harvested in a single operation) and is generally much costly (per t DM) to produce than other forage crops (NASS, 2015; Arvalis, 2011; Roth et al., 2001). Maize silage is also a good way to secure maize crops as it is possible to turn maize grain crops damaged by frost, rain or drought into maize silage (Arvalis, 2011; Roth et al., 2001). Though relatively easy to produce, maize silage requires good crop and harvest management as well as careful ensiling practices (see Processes and Forage management below) (Arvalis, 2011).

Baby corn silage

Baby corn is a much appreciated vegetable that is increasingly consumed worldwide. Baby corn consists of immature cobs of maize plants harvested young, 2-3 days after silk emergence and before pollination. Baby corn can be obtained from the same hybrids as other maize crops or from adapted hybrids that are shorter and develop many stalks (Indriani et al., 2015; Kaiser et al., 2011). Baby corn is a fast growing cash crop requiring only 55-60 days between planting and harvest (Srichana et al., 2014). Because it is harvested at an early stage of growth, the crop residues including stalks, leaves, husks and silk provide very good quality forage, fresh and palatable to livestock (Indriani et al., 2015; Srichana et al., 2014). In the tropics, it can be grown all year round. In Thailand, baby corn production was over 276 000 t in 2013. As edible baby corn cob accounts for no more than 15% of it, it can be assumed that the remaining 85% of the production could provide more than 1 million t of forage (green matter) (Srichana et al., 2014). Baby corn forage can be fed fresh or ensiled.


The technique consisting in preserving green crops in silos, similar to the sauerkraut process, has been used since the early 19th century in Germany, Scandinavia and the French Alps. In 1877, French agriculturist Auguste Goffart popularised the technique in a book (Goffart, 1877) that was later translated in English (Brown, 1880), and ensiling green maize was soon introduced to the USA. In Northern Europe, however, the process only took off in the 1970-1980s after early maize hybrids were developed, enabling maize cultivation in cooler areas (Renoux, 2016).

Today, maize silage is the main way of providing maize forage to livestock and has largely replaced green maize forage. In France, for example, maize silage accounted for 20% of cattle diets in 2015 (for both dairy and beef cattle) (AGPM, 2015). The worldwide area used for maize forage is about 16.8 million ha (AGPM, 2015). The EU 28 is the first producer with 6.1 million ha maize forage in 2015 among which 1.2 million ha were dedicated to biogas production (CEPM, 2015). European production of maize forage has steadily increased since 2000 from 4 million ha to 6 million ha in 2015 (AGPM, 2015). In the USA, maize silage area was 2.51 million ha in 2015 (NASS, 2016).


Harvesting and chopping operations

Maize forage should be harvested at 30-35% DM. The choice of harvesting time is a trade-off between yield, nutritive value and silage quality (Arvalis, 2011). The ideal harvesting time is when the plant has reached physiological maturity and is in the full dent. This stage is generally occurring 50-55 days after cob silking. It corresponds to 32-38% DM in the whole plant and could be correlated with two visual indicators in the grain, the milk line (limit between the dent part and the liquid part of the grain) and the black layer (that is visible at the base of the kernel once complete maturity has occured). Optimal time begins when the milk line of the grain is situated between 1/3 and 2/3 of the grain from the top (see the seed figure below) (Ashley, 2001). Once the black layer appears, the DM content is higher than 37% and the grain shoud be ground to prevent loss of digestiblity (Ashley, 2001). 

Lower or higher DM content may result in poor silage quality. Low DM content due to early harvest results in low DM silage which may be bulky, thus reducing feed intake and animal performance (Hicks et al., 2004 cited by Johansson, 2011). A low DM content results in nutrient losses (DM, water soluble carbohydrates and protein) during ensiling (leachates) (McDonald et al., 2002). Low DM content (less than 30%) increases the risks of bacterial and fungal spoilage (Johansson, 2011).

Harvesting too late can cause a low nutritive value of silage because of poor starch and fibre digestibility (Giardini et al., 1976). Such silage may have a low palatability, which may reduce DM intake (McDonald et al., 2002). Late harvest may result in heating problems because of insufficient packing conditions (Nadeau et al., 2010). Late harvested maize silage should be finely chopped (UWEX, 2016).

Special harvest conditions

Frosted maize

In some areas, frost may occur before harvesting could be done. If the maize plant remains green after frost, it is possible to wait till it reaches adequate moisture content. If the maize plant was killed before it was ready for harvest, the crop may be left on the field to dry down provided it did not lose too many leaves. If the maize plant was ready for harvest, it should be harvested immediately. Frosted maize crop may be too dry and require finer chop and water addition, or addition of a wet forage during the ensiling process (UWEX, 2016).

Drought-stressed maize

Under heavy drought conditions, the maize plant may not be able to resume growth, and must be ensiled. However, in some cases, the stress is not so important and the plant can resume its growth, producing new dry matter later in the season. Drought-stressed maize plants generally have a lower energy content and sometimes a higher protein content. Such plants may cause nitrate poisoning (see Potential constraints on the "Nutritional aspects" tab), but ensiling is known to reduce nitrate levels by 50% in comparison to green chop (UWEX, 2016).

Maize harvest and chopping in France (GAEC Morfouasse, Brittany), in 2015:

Chopping operations

Efficient maize chopping is a compromise between fine chopping, which aims at improving silo compression (particles over 20 mm are normally undesirable), and coarse chopping, which increases nutritive value and limits the risk of acidosis. The quality of chopping is variable, depending on harvesting, chopping and desiling machines. Average length of particles ranges from 8-10 mm to 11-15 mm (Battegay et al., 2013). A chopping equipment was developped to increase particle length up to 26-30 mm while increasing digestibility through shredding: this process, called shredlage, is now used commercially in the USA and in Europe (Ferraretto et al., 2012).

Silage management

Silage management should result in low oxygen concentration, augmentation of carbon dioxide and creation of acidic environment to prevent further microbial/fungal growth. Under optimal conditions, undesirable spoilage microorganisms will not grow. Good silage management is very important for preventing molds and mycotoxins. There is a wide variety of silos types and ensiling practices. 

Horizontal silo filling in Brazil:

Maize ensiling in Hyderabad, India:

Poor silo management conditions include: inappropriate DM content of crop reducing final silage packing density, inadequate particle length, slow silo filling, imperfect sealing and compression, delay in mass pH drop, air penetration in ensiled mass, inappropriate unloading equipment and techniques. Poor ensiling conditions can expose silages to risk of air penetration, heat damage of nutrients and excessive proteolysis. They can favour development of aerobic spoilage microorganisms and the production of mycotoxins (Gallo et al., 2015). Deleterious conditions are prone to occur in the peripheral parts of the silo which are sealed and packed with difficulty (Gallo et al., 2015). During silo filling it is necessary to use clean, new, good quality sheets to cover the soil and the silage. It is possible to use old sheets for double protection of the silo (above the first new packing sheet) (Sagot et al., 2014).

After silo opening, oxygen becomes available to the front of the mass. The activity of yeasts and molds resulting from the survival of fungal spores or from a re-colonization may reduce stability of ensiled mass and favour potentially toxigenic fungi development (Gallo et al., 2015). Preventive procedures are necessary to reduce air penetration and guarantee good fermentation: particle size must be adapted to the moisture content (at low moisture content, the particle size should be smaller) and silo size must be adapted to the number of animals to feed so that open front do not remain untouched for too long between two cuts. In Europe, it is advised to cut 20-30 cm silage every day, and the size of the silo must be calculated according to this recommendation and to the number of animals (Sagot et al., 2014).

Silo compression must be complete and good quality polythene wall sheet or different polythene sheets must be used to cover the ensiled mass. The packed silo must then be put under adequate distribution of weight (heavy bags or car tires) on its top to limit oxygen contact in the peripheral zones of the silo (Gallo et al., 2015).

Forage management 


Maize crop provides higher yields than most other forages: between 12 and 18 t DM/ha in France; 15 t DM/ha on average in the USA.


The development of maize hybrids has been instrumental in the worldwide success of maize silage, and the choice of a suitable hybrid is most important factor for profitable silage production. The main criteria for selecting a hybrid variety are yield, precocity, and resistance to diseases, pests and lodging (Delmotte, 2010). Stalk characteristics are usually modified with the aim of increasing the digestibility of fibre in maize silage. Grain characteristics can be altered through modifications in nutrient or starch composition (Ferrareto et al., 2015). Some hybrids intended for grain production have high yield and high DM and fibre digestibilities, and are thus suitable for forage production. Some leafy types have yields similar to those of grain types but have softer kernels that dry down more slowly. Such varieties may have lower starch and higher fibre contents. Some leafy types are designed for silage use while others have a faster drying rate. Brown Midrib types have lower yields and much higher fibre digestibility, but may be more costly. Waxy types have been used for silage but with inconsistent results (Roth et al., 2001). Some hybrids called "Stay-green" maintain leafiness and have a slower DM accumulation in the grain (Arriola et al., 2012).

In the tropics, hybrids with late maturity are desirable to maximize yields. However, they require more water and have lower grain-to-stover ratios. Earlier-maturing hybrids use less irrigation water and generally have better grain-to-stover ratios. Under growing conditions in Hawaii, hybrids designed for silage are generally taller, leafier, more resistant to diseases and they should be more densely planted than hybrids grown for grain (Brewbaker, 2003).

Establishment and cultivation

Maize silage can be produced under traditional tillage or under conservation tillage. In the first case, tillage incorporates all crop residues before sowing. Under conservation tillage systems 30% (or more) crop residues are left on the soil surface to limit erosion, water evaporation, reduce fuel costs (lower depth of tillage) and labour costs. Producing maize silage in conservation tillage systems can be more difficult. It is necessary to choose hybrids with high seedling vigour and to sow at 10-15% higher rate because seeds mortality is higher and seedling emergence has to occur through the cover crop residue. The planting date must be adapted to each growing condition. However, it is generally advised that maize intended for silage can be sown later than maize intended for grain, and at higher seed rate for maximizing yields. In warm, dry season, maize crops require irrigation for maximum production whether for grain or silage production (UWEX, 2016). 

Environmental impact 

Soil depletion

Maize crops drain nutrients from the soil, do not compete well with weeds after the seedling stage and are subject to many diseases and pests. In consequence, the cultivation of high-producing maize requires high fertilizer levels as well as herbicides, pesticides and fungicides, which are deleterious to biodiversity and soil conservation. Heavy fertilizer applications can cause nitrate leaching and soil erosion. Herbicides may contaminate the groundwater while pesticides alter biodiversity (European Commission, 2000). In developing countries where fertilizers are too expensive for general use, the nutrient uptake is higher than when fertilizers are regularly used, thus reducing soil fertility and causing further soil degradation (CIMMYT, 2009).

Genetically modified maize (GM maize)

The debate about the environmental impact of GM crops is complex and a full discussion of the issue is beyond the scope of this datasheet.  GM maize hybrids with insect or herbicide tolerance have been commercialised since 1996 and are highly popular in certain countries (93% of planted maize in the USA in 2014; Ferrareto et al., 2015) because of their economic benefits, but their environmental impact has been the subject of considerable debate. Positive impacts have been reported for GM maize, notably a reduction in herbicide and pesticide use, and certain benefits for wildlife (Edwards et al., 2009). However, potential negative effects have been alleged, including the alteration of the DNA of soil microflora, and deleterious impacts on useful insects such as butterflies and bees, or on non-GM plants (including maize) through genome transfer (Dale et al., 2002).

Life Cycle Assessment

Production of maize silage includes two major stages: chopping and ensiling. The Life Cycle Assessment (LCA) of maize silage production showed that the chopping stage was responsible for the main part of the environmental burden of maize silage (more than 88% for all the evaluated impact categories of the LCA) while ensiling is responsible for a small share of the overall impact (Bacenetti et al., 2015). Compared to maize silage stored in bunker silo, silage stored in silo bags showed lower environmental impact for all the evaluated impact categories (from -5% to -9%). Such a difference is mainly explained by lower DM losses occurring through the use of silo bags (Bacenetti et al., 2015). 

NO2 gas in the maize silo

Maize plants containing high amount of nitrates produce nitrogen dioxide (NO2) during the early stages of fermentation. NOseverely injures lung tissues and may cause suddent death. NO2 is heavier than air and thus tends to remain above the silo. It has a bleach-like odour and forms a reddish-brown haze. Maize with potential high nitrate content should not be harvested soon after rain ending a dry period (Bagg, 2012). Ensiling in horizontal silos or in silo bags reduces the risk of NO2 intoxication (Bagg, 2012).

Nutritional aspects
Nutritional attributes 

Maize silage is a heterogeneous fodder that includes both starchy material (from the grain) and fibre (cell walls from stalks and leaves) in variable proportion, depending on genetics, stage of maturity and growing conditions (Peyrat, 2014; Roth et al., 2001). Maize silage contains about 25-35% dry matter. It is relatively poor in protein (5-10% DM) and rich in fibre (15-27% DM), with highly variable starch content (18-37% DM). It is low in lignin and lipids (about 2-3% DM each).

Potential constraints 

Nitrate poisoning

Maize cultivation requires large amounts of N fertilizer (inorganic or manure). Under some conditions, like extended dry periods ended by rains, nitrogen may accumulate in the plants in the form of nitrates which are toxic to livestock. This is particularly true during 5-7 days after the rain (Bagg, 2012; Brewbaker, 2003). However, ensiling and good practices can reduce the nitrate level in maize silage. Maize plants should be in good state at the time of harvest (neither too wet nor too dry) to promote good fermenting condition and reduce nitrate content. A well-managed 3-5 week ensiling period can reduce nitrate content by 40%. Cutting shoud be done above the bottom third of the stalk, where most nitrates are present (Bagg, 2012).

Silage spoilage and mycotoxins

Aerobic spoilage may occur at various stages of ensiling (see Processes under the "Description" tab for prevention methods). Aerobic spoilage cause the development of FusariumPenicillium or Aspergillus fungi. The most important issue with maize silage is the development of Fusarium, which produces vomitoxin (DON), fumonisin, zearalenone, and T-2 mycotoxins. Aspergillus is a source of aflatoxins (Tapia et al., 2005). Penicillium roqueforti produces penicillic acid, known for its antimicrobial activity, and which impairs rumen health and reduces feed intake. Penicillium roqueforti is also responsible for the production of the neurotoxin roquefortine C and of mycophenolic acid, a potent immunosuppressant (Berge, 2011). Other Penicillium species produce patulin, which affects ruminal fermentation and is both a neurotoxin and a cell toxin (Berge, 2011).


Maize silage has become the predominant forage fed to ruminant livestock in many parts of Europe, Australia, New Zealand, North America and also in India, offered alone or as a complement to grass silage. Its main advantages are a high starch content, a high protein efficiency ratio and a relatively high content in digestible energy and nutrients (Fitzgerald et al., 1998; INRA, 2007; Keady et al., 2013; Malisetty et al., 2013). However, maize silage has a low protein content, which declines as maturity increases (INRA, 2007; Keady et al., 2013). Diets including maize silage must usually be supplemented with sources of energy and protein, particularly for high-producing livestock.

Digestibility and energy values

The OM digestibility of maize silage ranges from 62% to 76% and depends on growing conditions, stage of growth and at harvest (Barrière et al., 2003; INRA, 2007). OM digestibility was also shown to vary between different maize hybrids depending on their earliness. OM digestibility was comprised between 72% for very early hybrids and 67% for very late ones (Michalet-Doreau et al., 1999). The amount and composition of whole plant cell walls, especially their lignification, influences both digestibility and voluntary intake when maize is given as silage (Barrière et al., 2003). Starch is degraded slowly in the rumen, and differences among genotypes exist. Starch degradability also depends on plant maturity: it decreased from more than 80% to less than 50% when whole plant DM increased from 25% to 40% (Michalet-Doreau et al., 1999). In the case of baby corn husks, in vitro OM digestibility (83 vs. 79%) and ME content (10.2 vs. 9.2 MJ/kg DM) were higher for fresh baby corn husks compared to baby corn husks silage (Bakshi et al., 2012).

Intake and palatability

Voluntary intake of maize silage varies greatly. Well-preserved silages can be ingested at levels similar to the fresh or dry maize forages, but intake levels decrease with preservation quality and poorly preserved silages may have a low palatability. Acidity has a negative effect on maize silage intake in cattle, as acidity is generally negatively linked to DM, and cattle, unlike sheep, are very sensitive to these factors. The low protein level of maize silage, when unsupplemented, can negatively affect intake (Dulphy et al., 1996). In India, baby corn husks silage offered as a total mixed ration with wheat straw and concentrate mixture to male buffalo calves resulted in higher nutrient digestibility, voluntary intake and N retention than for fresh baby corn husks (Bakshi et al., 2012).

Dairy cows

Effect of hybrid types

The nutritional quality of maize silage can be improved through hybrid selection and can benefit dairy farmers through better lactation performance and feed efficiency. A meta-analysis of the 48 papers published between 1995 and 2014 showed that intake, digestibility, rumen fermentation and lactation performance by dairy cows were affected by the type of hybrid (see Table 1). Hybrids selected for greater fibre digestibility increased milk yield and protein yield through a higher DM intake, but failed to improve feed efficiency and reduced starch digestibility. Lactation performance was little improved by non-GM hybrids and not improved at all by GM hybrids (Ferrareto et al., 2015).

Table 1: Effect of maize silage hybrids on lactation performances by dairy cows (range of the least square means; SEM in brackets), adapted from Ferrareto et al., 2015.

Treatment DMI, kd/d Milk, kg/d Milk fat, kg/d Milk protein, kg/d
Maize silage hybrids with different stalk characteristics 23.7-24.9 (0.4) 37.2-38.7 (0.8) 1.34-1.37 (0.03) 1.13-1.18
Maize silage hybrids with different grain characteristics 23.6-24.1 (1.1) 36.1-37.7 (1.9) 1.20-1.33 (0.08) 1.11-1.16
Genetically modified maize silage hybrids 24.3-24.4 (0.7) 34.8-35.0 (1.3) 1.25-1.26 (0.04) 1.11
Use of maize silage in grass silage based diets

A review of 34 comparisons in which grass silage was partially or totally replaced with maize silage shows that maize silage significantly increased forage DM intake (+1.5 kg/d) and performances of lactating cows (+1.4 kg/d milk yield, +0.6 g/kg fat content, +0.86/kg protein content). Including maize silage in grass silage based diets could potentially spare concentrate use up to 5 kg/cow/d (Keady et al., 2013). 

From a series of experiments conducted in Ireland, it was shown that the inclusion of maize silage in diets with grass silage increased forage intake but the benefit in milk production depended on the maturity (starch content) and digestibility (greenness) of the crop when harvested (Table 2). In particular, partially replacing a high quality grass silage with good quality maize silage (starch 20-25% DM) increased forage intake, milk yield and milk protein concentration without affecting the efficiency of milk production. Moreover, the inclusion of 33% maize silage in the diet forage achieved most of the increase in milk yield but a higher inclusion level (67%) was required to maximize the yield of fat, protein and milk protein concentration. In practice a 50:50 mixture of maize silage and grass silage seemed to be near the optimum for milk production (Fitzgerald et al., 1998).

Table 2: Effect of inclusion of maize silage on lactation performance by dairy cows (means; SEM in brackets), adapted from Fitzgerald et al., 1998.

Treatment   Silage intake, kd/d Milk, kg/d Milk fat, kg/d Milk protein, kg/d
% of inclusion of maize silage with grass silage 0% 8.8 (0.35) 21.4 (0.48) 0.81 (0.02) 0.65 (0.01)
  33% 9.7 (0.35) 23.0 (0.48) 0.84 (0.02) 0.71 (0.01)
  67% 10.4 (0.35) 23.1 (0.48) 0.86 (0.02) 0.73 (0.01)
  100% 10.7 (0.35) 22.7 (0.48) 0.84 (0.02) 0.70 (0.01)
High quality grass silagea 8.9 (0.32) 18.6 (0.70) 0.85 (0.03) 0.66 (0.02)
Moderate starch maize silage (242 g/kgDM)
+ grass silage (60:40)a
11.1 (0.32) 20.5 (0.70) 0.91 (0.03) 0.73 (0.02)
High starch maize silage
(293 g/kgDM) + grass silage (60:40)a
11.7 (0.32) 19.5 (0.70) 0.88 (0.03) 0.71 (0.02)

a with 4-8 kg/d concentrate

Growing cattle

A review of 9 studies in which grass silage was partially or totally replaced by maize silage showed that maize silage significantly increased forage DM intake (+1.5 kg/d) and performance of beef cattle (+0.23 kg/d live weight gain; +0.11 kg/d carcass gain; +12 kg carcass weight). The response to the inclusion of maize silage in the diet was shown to be dependent on the stage of maturity of maize at harvest and on the level of inclusion in the diet. When offered ad libitum as the sole forage, daily carcass gain was increased by 31% due to a combination of increased metabolisable energy intake and improved efficiency of metabolisable energy utilization. Finally, a potential concentrate sparing effect of up to 2.4 kg/beef cow/d was reported when maize silage was included in the diet. The effect depended on the level of maize inclusion and crop maturity at harvest (Keady et al., 2013).


In many sheep-producing regions in Europe, animals are housed during the winter feeding period and offered ensiled forage. Few studies have been undertaken to evaluate the effects of maize silage on the performance of pregnant ewes or finishing lambs. However, its low protein content may impact its ability to meet the protein requirements of animals with high requirements. A review of studies conducted in the UK concluded that maize silage can replace high-feed value grass silage in the diet of ewes in mid and late-pregnancy (Table 3). Maize silage, whilst low in protein content, can be offered as the sole forage without protein supplementation until late pregnancy (final 6 to 7 weeks). Increasing the maturity of maize at harvest tended to increase lamb weaning weight by 1 kg (Keady et al., 2013).

Table 3: Effect of maize silage maturity and grass silage feed value on ewe and lamb performance (range of the least square means; SEM in brackets), adapted from Keady et al., 2013.

Treatmenta Ewe weight post lambing, kg Lamb weight at birth, kg Lamb weight at weaning, kg Carcass weight, kg
Maize silage with low DM content 63.0-68.6 (2.2) 4.6-4.9 (0.2) 32.8-33.4 (1.1) 18.2-18.9 (0.4)
Maize silage with high DM content 68.2-76.6 (2.2) 4.7-5.3 (0.2) 34.1-34.3 (1.1) 18.7-19.1 (0.4)
Grass silage with low feed value 61.2-61.6 (2.2) 4.6 (0.2) 32.1-33.6 (1.1) 18.8-19.1 (0.4)
Grass silage with high feed value 70.4-73.6 (2.2) 4.8-5.1 (0.2) 34.0-35.0 (1.1) 19.2-19.6 (0.4)

a animals were supplemented with 0 to 200 g soybean meal and/or 5 to 25 g concentrate.

Concerning finishing lambs, increasing the maturity of maize at time of ensiling (and subsequently decreasing starch content) improved carcass gain. Maize silage could replace high and medium feed-value grass silage in the diet, resulting in equivalent or improved daily carcass gain respectively (Table 4). Replacing medium feed-value grass silage with maize silage resulted in a potential concentrate sparing effect of up to 0.48 kg/lamb/d (Keady et al., 2013).

Table 4: Effect of forage type on lamb performance (range of means), adapted from Keady et al., 2013.

Treatmenta Total DM intake, kg/d Carcass weight, kg Carcass gain, g/d
Maize silage 1.1-1.3 20.2-23.3 59-107
Medium feed value grass silage 0.9-1.2 17.3-22.8 14-98
High feed value grass silage 1.1-1.3 20.6-24.2 62-119

a animals were complemented with 0.3 to 1 kg/d concentrate.

Farmers in India are showing increasing interest in preparing and feeding maize silage based rations to their ruminant livestock, particularly small ruminants such as growing sheep, to obtain optimum body weight. Maize silage was successfully supplemented either with alfalfa hay, groundnut haulms (to meet 25% of DM requirement) or concentrate mixture at 1.5% of body weight for obtaining optimum growth rate in Nellore ram lambs (Malisetty et al., 2013).


Use of maize silage in grass silage based diets

In Malaysia, the inclusion of increasing proportion of maize silage to elephant grass (Pennisetum purpureum) silage increased DM intake and growth performance of goats. Animals fed with 100% whole maize silage would most likely show the highest growth and better nutrient digestibility (Table 5; Khaing et al., 2015).

Table 5: Effect of inclusion of maize silage in the diet (60% forage, 40% concentrate) on growth performance by goat (means; SEM in brackets), adapted from Khaing et al., 2015.

Treatment: % of inclusion of maize silage
with elephant grass silage
OM digestibility, % DM intake, kd/d Total body weight gain, kg Body weight gain, g/d
0% 59.2 (1.43) 277 (20) 3.0 (0.8) 35.7 (2.1)
25% 62.9 (1.43) 339 (20) 4.8 (0.8) 57.1 (2.1)
50% 69.0 (1.43) 381 (20) 6.4 (0.8) 75.6 (2.1)
75% 67.1 (1.43) 407 (20) 8.1 (0.8) 96.0 (2.1)
100% 72.8 (1.43) 464 (20) 10.5 (0.8) 125.4 (2.1)
Influence of aerobic exposure of maize silage

In a preference trial, fermentation products of maize silage were affected by aerobic exposure, which had strong impacts on feed intake and feed preference by goats, evidenced by a decrease of DM intake after four days of exposure. During 3h preference trials (2-way combination of maize silage and alfalfa hay), intake decreased from 651 g DM of maize silage (for 0 days of exposure) to 464 g DM of maize silage (for 8 days of exposure). However, it was difficult to attribute the decline to a single cause. It was recommended to limit silage exposure to oxygen during storage and feeding as much as possible because of its detrimental effects on intake (Gerlach et al., 2013).


Because of its high fibre content, maize silage is not recommended for growing pigs. However, it can be used to feed gestating sows and gilts over 110 kg. Maize silage fed to gestating sows was reported to reduce feed costs by 20% and to enhance the number of weaned piglets (Pickett et al., 1965). Maize should be harvested when the ears are formed and should not be too mature as it becomes less palatable. Silage should be finely chopped so that sows do not sort between stalks and cobs/grains. Silage should be free of molds. Intake can be high as 4.5-5 kg/head/d and would requires about 1.25 kg dietary supplement (Blair, 2007).

Maize silage is well accepted by rabbits (Brazhnikov, 1983; Piatek et al., 1986). However, it is not frequently used in practical rabbit feeding, most probably because of the labour necessary to distribute small quantities of silage to small animals such as rabbits. In an Egyptian study, maize silage proposed ad libitum to growing rabbits as a supplement to a concentrate represented about 12-13% of the total DM intake and allowed growth performance (daily gain of 17.9-19.5 g) similar to that obtained with other forages such as fresh or ensiled berseem, or sugar beet top + berseem silage (El-Ayouty et al., 2000). An early study, found that DM digestibility of maize silage is low (55%) and crude protein digestibility is high: 79% (Brüggemann, 1939 cited by Voris et al., 1940). This high protein digestibility was confirmed more recently in the Egyptian study cited above (El-Ayouty et al., 2000). However, this apparent improvement after ensiling is most probably the consequence of true protein degradation during fermentation and partial transformation of amino acids in completely digestible but poorly recoverable ammonia, as it was observed with alfalfa silage (Perez et al., 1990).
Nutritional tables

Avg: average or predicted value; SD: standard deviation; Min: minimum value; Max: maximum value; Nb: number of values (samples) used

Main analysis Unit Avg SD Min Max Nb  
Dry matter % as fed 23.5 1.1 20.2 24.9 187  
Crude protein % DM 8.0 1.3 5.1 11.7 180  
Crude fibre % DM 23.6 2.2 18.3 29.6 174  
NDF % DM 49.3 5.1 47.7 65.0 11 *
ADF % DM 27.0 4.7 26.4 43.0 10 *
Lignin % DM 3.2 1.4 3.0 7.5 10 *
Ether extract % DM 2.6 1.3 1.2 6.6 17  
Ash % DM 4.8 1.0 2.3 7.7 177  
Starch (polarimetry) % DM 14.6 6.5 4.5 25.6 26  
Gross energy MJ/kg DM 18.9 0.7 16.9 18.9 8 *
Minerals Unit Avg SD Min Max Nb  
Calcium g/kg DM 2.1 0.5 1.2 3.4 133  
Phosphorus g/kg DM 1.9 0.3 0.9 2.7 136  
Potassium g/kg DM 13.9 3.8 7.7 18.1 7  
Sodium g/kg DM 0.2 0.2 0.0 0.5 6  
Magnesium g/kg DM 1.2 0.3 0.5 1.9 53  
Manganese mg/kg DM 24 10 13 45 12  
Zinc mg/kg DM 27 17 14 79 14  
Copper mg/kg DM 5 1 2 7 15  
Iron mg/kg DM 77 38 46 150 7  
Amino acids Unit Avg SD Min Max Nb  
Alanine % protein 8.5   7.7 9.3 2  
Arginine % protein 2.3   2.1 2.5 2  
Aspartic acid % protein 9.0   6.9 11.1 2  
Cystine % protein 1.2   1.1 1.3 2  
Glutamic acid % protein 11.3   11.1 11.5 2  
Glycine % protein 4.3   4.2 4.4 2  
Histidine % protein 1.2   1.1 1.4 2  
Isoleucine % protein 3.7   3.4 3.9 2  
Leucine % protein 7.5   6.7 8.2 2  
Lysine % protein 3.8   3.8 3.8 2  
Phenylalanine % protein 4.0   3.6 4.4 2  
Proline % protein 5.1   4.6 5.5 2  
Serine % protein 4.4   4.4 4.4 2  
Threonine % protein 3.7   3.6 3.8 2  
Tyrosine % protein 2.3   1.9 2.8 2  
Valine % protein 4.6   4.3 4.9 2  
Ruminant nutritive values Unit Avg SD Min Max Nb  
OM digestibility, ruminants % 70.3 4.4 60.6 74.2 10 *
Energy digestibility, ruminants % 67.7 4.8 55.3 70.4 8 *
DE ruminants MJ/kg DM 12.8 1.2 9.3 13.0 6 *
ME ruminants MJ/kg DM 10.5 1.3 7.2 10.9 7 *
Nitrogen digestibility, ruminants % 54.9 15.1 24.0 68.4 8  

The asterisk * indicates that the average value was obtained by an equation.


ADAS, 1988; AFZ, 2011; Andrieu, 1976; Azevêdo et al., 2011; Christensen et al., 1977; CIRAD, 1991; Hassoun, 2009; Holm, 1971; Kamalak et al., 2003; Mafakher et al., 2010; Meschy, 2010; Phipps et al., 1979; Prado et al., 2004; Sarwatt et al., 1989; Valdez et al., 1988; Valentin et al., 1999; Wainman et al., 1979

Last updated on 25/08/2016 18:25:34

Main analysis Unit Avg SD Min Max Nb  
Dry matter % as fed 28.2 1.3 24.1 30.0 2465  
Crude protein % DM 7.2 0.8 4.9 9.8 2318  
Crude fibre % DM 21.4 1.7 16.6 26.5 2152  
NDF % DM 46.1 7.3 38.2 62.7 20 *
ADF % DM 24.6 4.2 21.4 35.0 21 *
Lignin % DM 2.9 1.7 2.0 7.0 16 *
Ether extract % DM 2.5 0.8 1.0 3.9 18  
Ash % DM 3.9 0.5 2.3 5.7 2219  
Starch (polarimetry) % DM 24.4 5.9 11.2 36.6 231  
Total sugars % DM 0.2       1  
Gross energy MJ/kg DM 19.0 0.3 17.9 19.0 8 *
Minerals Unit Avg SD Min Max Nb  
Calcium g/kg DM 2.0 0.5 1.0 3.5 2141  
Phosphorus g/kg DM 1.8 0.3 1.0 2.6 2142  
Potassium g/kg DM 10.9 1.9 7.4 15.0 39  
Sodium g/kg DM 0.1 0.1 0.0 0.5 40  
Magnesium g/kg DM 1.1 0.2 0.4 1.8 773  
Manganese mg/kg DM 26 11 7 55 109  
Zinc mg/kg DM 22 7 10 44 130  
Copper mg/kg DM 5 1 3 7 133  
Iron mg/kg DM 63 18 38 112 86  
Amino acids Unit Avg SD Min Max Nb  
Alanine % protein 6.2       1  
Arginine % protein 1.8       1  
Aspartic acid % protein 9.5       1  
Cystine % protein 0.9       1  
Glutamic acid % protein 11.2       1  
Glycine % protein 3.3       1  
Histidine % protein 1.6       1  
Isoleucine % protein 3.0       1  
Leucine % protein 6.1       1  
Lysine % protein 3.3       1  
Phenylalanine % protein 3.0       1  
Proline % protein 4.0       1  
Serine % protein 3.1       1  
Threonine % protein 3.0       1  
Tyrosine % protein 1.7       1  
Valine % protein 3.8       1  
Ruminant nutritive values Unit Avg SD Min Max Nb  
OM digestibility, ruminants % 71.1 1.9 71.1 76.2 7 *
Energy digestibility, ruminants % 68.6 2.2 68.5 74.5 7 *
DE ruminants MJ/kg DM 13.1         *
ME ruminants MJ/kg DM 10.8 0.5 10.4 11.7 6 *
Nitrogen digestibility, ruminants % 66.2   59.4 73.0 2  

The asterisk * indicates that the average value was obtained by an equation.


Abdelqader et al., 2009; AFZ, 2011; Andrieu, 1976; Azevêdo et al., 2011; Carvalho et al., 2006; Christensen et al., 1977; CIRAD, 1991; Geron et al., 2008; Geron et al., 2010; Hassoun, 2009; Koc et al., 2010; Meschy, 2010; Mulrooney et al., 2009; Noftsger et al., 2000; Nostre et al., 1994; Phipps et al., 1979; Salgado et al., 2013; Stockdale, 1994; Swanson, 1972; Taghizadeh et al., 2005; Valentin et al., 1999; Vérité, 1975; Wainman et al., 1979

Last updated on 25/08/2016 18:24:30

Main analysis Unit Avg SD Min Max Nb  
Dry matter % as fed 32.5 1.4 30.0 35.0 5642  
Crude protein % DM 6.9 0.7 4.7 9.3 5438  
Crude fibre % DM 20.2 1.8 15.1 25.5 4857  
NDF % DM 44.3 4.5 37.5 54.7 26 *
ADF % DM 23.3 4.2 18.6 33.2 31 *
Lignin % DM 2.7 1.0 1.9 5.1 28 *
Ether extract % DM 2.8 0.8 1.3 4.0 27  
Ash % DM 3.7 0.5 2.1 5.4 5043  
Starch (polarimetry) % DM 29.1 4.7 16.8 40.6 519  
Total sugars % DM 0.2       1  
Gross energy MJ/kg DM 18.8 0.5 16.9 18.8 10 *
Minerals Unit Avg SD Min Max Nb  
Calcium g/kg DM 1.9 0.4 1.0 3.2 4939  
Phosphorus g/kg DM 1.7 0.3 1.0 2.6 4972  
Potassium g/kg DM 10.3 1.6 7.0 14.1 157  
Sodium g/kg DM 0.1 0.1 0.0 0.3 147  
Magnesium g/kg DM 1.1 0.2 0.5 1.8 1884  
Manganese mg/kg DM 25 12 6 60 186  
Zinc mg/kg DM 24 8 10 45 221  
Copper mg/kg DM 4 1 2 8 224  
Iron mg/kg DM 59 19 19 125 78  
Amino acids Unit Avg SD Min Max Nb  
Alanine % protein 8.1 1.0 6.9 8.7 3  
Arginine % protein 2.4 0.4 2.2 2.8 3  
Aspartic acid % protein 7.7 0.9 6.8 8.6 3  
Cystine % protein 1.5 0.5 1.0 2.0 3  
Glutamic acid % protein 13.2 1.0 12.3 14.3 3  
Glycine % protein 3.9 0.5 3.4 4.4 3  
Histidine % protein 1.9 0.2 1.7 2.1 3  
Isoleucine % protein 3.5 0.2 3.3 3.7 3  
Leucine % protein 9.2 1.4 7.7 10.5 3  
Lysine % protein 3.0 0.1 2.9 3.2 3  
Methionine % protein 1.6       1  
Phenylalanine % protein 4.1 0.6 3.6 4.7 3  
Proline % protein 6.4 1.1 5.2 7.2 3  
Serine % protein 3.9 0.5 3.5 4.4 3  
Threonine % protein 3.5 0.4 3.2 4.0 3  
Tyrosine % protein 2.9 0.6 2.4 3.6 3  
Valine % protein 4.8 0.7 4.2 5.6 3  
Ruminant nutritive values Unit Avg SD Min Max Nb  
OM digestibility, ruminants % 71.7 3.4 68.5 77.8 8 *
Energy digestibility, ruminants % 69.1 3.2 65.4 73.8 7 *
DE ruminants MJ/kg DM 13.0         *
ME ruminants MJ/kg DM 10.8 0.6 10.2 11.7 7 *
Nitrogen digestibility, ruminants % 54.6       1  
Nitrogen degradability (effective, k=6%) % 67       1  

The asterisk * indicates that the average value was obtained by an equation.


AFZ, 2011; Andrieu, 1976; Benchaar et al., 1991; Carvalho et al., 2006; CIRAD, 1991; Cunningham et al., 1993; Denek et al., 2004; Gehman et al., 2010; Geron et al., 2008; Hassoun, 2009; Holzer et al., 1985; Illg et al., 1987; Karalazos et al., 1988; Kelzer et al., 2009; Kleinschmit et al., 2006; Leonardi et al., 2005; Meschy, 2010; Murdock et al., 1977; Oliveira et al., 2007; Phipps et al., 1979; San Emeterio et al., 2000; Smolders et al., 1990; Souza et al., 2004; Stockdale, 1994; Susmel et al., 1991; Swanson et al., 1990; Teixeira et al., 2007; Valentin et al., 1999; Wainman et al., 1979; Woodward et al., 2006

Last updated on 25/08/2016 18:23:59

Main analysis Unit Avg SD Min Max Nb  
Dry matter % as fed 37.0 1.4 35.0 40.6 2917  
Crude protein % DM 6.8 0.8 4.7 9.1 2807  
Crude fibre % DM 19.8 2.1 14.2 25.8 2426  
NDF % DM 43.6 7.7 38.5 65.4 14 *
ADF % DM 22.7 4.8 17.2 36.4 15 *
Lignin % DM 2.6 1.1 1.6 4.6 11 *
Ether extract % DM 3.0 0.8 2.1 4.7 18  
Ash % DM 3.6 0.5 2.2 5.2 2668  
Starch (polarimetry) % DM 31.6 4.3 21.1 42.0 368  
Gross energy MJ/kg DM 19.1 0.9 16.8 19.1 4 *
Minerals Unit Avg SD Min Max Nb  
Calcium g/kg DM 1.9 0.4 1.0 3.2 2455  
Phosphorus g/kg DM 1.7 0.2 1.1 2.5 2468  
Potassium g/kg DM 10.3 2.0 6.0 16.1 111  
Sodium g/kg DM 0.1 0.1 0.0 0.2 95  
Magnesium g/kg DM 1.2 0.2 0.6 1.8 1029  
Manganese mg/kg DM 25 12 5 55 128  
Zinc mg/kg DM 22 6 11 38 141  
Copper mg/kg DM 4 1 2 7 140  
Iron mg/kg DM 60 31 25 150 51  
Ruminant nutritive values Unit Avg SD Min Max Nb  
OM digestibility, ruminants % 71.9         *
Energy digestibility, ruminants % 69.4         *
DE ruminants MJ/kg DM 13.2         *
ME ruminants MJ/kg DM 11.0         *
Nitrogen degradability (effective, k=6%) % 70   68 72 2  

The asterisk * indicates that the average value was obtained by an equation.


Adewakun et al., 1989; AFZ, 2011; Andrieu, 1976; Beckman et al., 2005; Chaves et al., 2006; CIRAD, 1991; Clark et al., 1997; Faverdin et al., 1991; Geron et al., 2008; Hassoun, 2009; Holtshausen et al., 2011; Hurtaud et al., 2007; McGuffey et al., 1980; Meschy, 2010; Stockdale, 1994; Susmel et al., 1989; Susmel et al., 1991; Velez et al., 1991; Wainman et al., 1979

Last updated on 25/08/2016 18:23:10

Datasheet citation 

Heuzé V., Tran G., Edouard N., Lebas F., 2016. Maize silage. Feedipedia, a programme by INRA, CIRAD, AFZ and FAO. http://www.feedipedia.org/node/13883 Last updated on October 5, 2016, 13:01