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Gamba grass (Andropogon gayanus)

IMPORTANT INFORMATION: This datasheet is pending revision and updating; its contents are currently derived from FAO's Animal Feed Resources Information System (1991-2002) and from Bo Göhl's Tropical Feeds (1976-1982).

Datasheet

Description
Click on the "Nutritional aspects" tab for recommendations for ruminants, pigs, poultry, rabbits, horses, fish and crustaceans
Common names 

Gamba grass, bluestem, Rhodesian andropogon, Rhodesian blue grass, onga, tambuki grass, sadabahar

Synonyms 

Andropogon bisquamulatus Hochst., Andropogon gayanus var. squamulatus Stapf, Andropogon squamulatus Hochst.

Related feed(s) 
Description 

Tall perennial tussock grass with stems up to 2 m high that grows on a variety of soils in areas 600-1100 mm of rain and 5- to 6-month dry season. Tolerates low fertility, but not waterlogging or over-grazing.

The anti-tick effect of Andropogon gayanus grass against Boophilus microplus has been demonstrated experimentally in Mexico by infesting fields with Boophilus microplus larvae over several years (Fernandez-Ruvalcaba et al., 2004).

Distribution 

One of the high-yielding grasses in West Africa.

Forage management 

Frequent burning tends to suppress this grass, and it is replaced by less useful species. Can stay green long into the dry season. Propagated vegetatively through splitting tillers or through seeding. Can be grown with Centrosema pubescens or Stylosanthes gracilis.

Nutritional aspects
Ruminants 

Palatable and nutritious when young, but produces numerous hard and unpalatable flowering stems which should be removed by burning or mowing.

Rabbits 

Gamba grass is used as forage in traditional rabbit feeding in different tropical countries such as Laos or Nigeria (Phimmasan et al. 2005; Ekwe et al., 2011). In a cafeteria test with 4 other green forages (Centosema pubescens, banana leaves, oil palm leaves and Calopogonium mucunoides) fresh leaves from 8-weeks early dry season regrowth of Andropogon gayanus, were accepted but were the less palatable of the different forages (Osakwe et al., 2007)

In a study on 3 sources of proteins, gamba hay was used with success as only additional source of fibre. Distributed in fixed quantity (75g/day and /head) daily gamba hay intake represented from 41 to 50% of the total daily intake during the growth period preceding reproduction (Aganga et al., 1991).

In a cafeteria test, gamba silage harvested at soft dough stage, fortified or not with different legumes forage so as to increase the protein content of the mixture (from 6.2 up to 8.1% DM), was slightly but significatvement preferred without addition of any other forage; but unfortunately no result of performance is available in this study (Muhammad et al., 2009). From general point of view, silage utilisation in rabbit feeding could source of problems if the total daily utilisation in the farm (for rabbits and ruminants if any) is not large enough to maintain day after day the quality of the silo content after opening.

Nutritional tables

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

IMPORTANT INFORMATION: This datasheet is pending revision and updating; its contents are currently derived from FAO's Animal Feed Resources Information System (1991-2002) and from Bo Göhl's Tropical Feeds (1976-1982).

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 27.8 1
Crude protein % DM 6.5 1
Crude fibre % DM 29.6 1
NDF % DM 65.1 *
ADF % DM 34.9 *
Lignin % DM 4.3 *
Ether extract % DM 3.1 1
Ash % DM 9.9 1
Gross energy MJ/kg DM 17.9 *
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 66.1 *
Energy digestibility, ruminants % 63.2 *
DE ruminants MJ/kg DM 11.3 *
ME ruminants MJ/kg DM 9.2 *
Nitrogen digestibility, ruminants % 52.3 1

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

References

Blair Ralns, 1963

Last updated on 24/10/2012 00:44:13

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 30.0 7.1 19.1 49.0 270
Crude protein % DM 7.8 2.6 3.0 13.7 307
Crude fibre % DM 36.8 3.6 29.2 44.6 288
NDF % DM 71.9 10.4 43.5 83.6 19 *
ADF % DM 42.9 7.3 29.2 52.0 18 *
Lignin % DM 6.0 2.2 2.3 9.3 18 *
Ether extract % DM 1.7 0.4 1.0 2.7 276
Ash % DM 8.3 1.9 5.2 13.1 306
Gross energy MJ/kg DM 18.2 *
 
Minerals Unit Avg SD Min Max Nb
Calcium g/kg DM 3.8 0.8 2.3 5.5 292
Phosphorus g/kg DM 1.6 0.5 0.7 2.9 296
Potassium g/kg DM 16.4 4.5 8.4 24.9 182
Sodium g/kg DM 0.1 0.1 0.0 0.2 17
Magnesium g/kg DM 2.1 0.5 1.1 3.3 174
Manganese mg/kg DM 196 66 82 339 87
Zinc mg/kg DM 25 5 15 34 87
Copper mg/kg DM 5 2 3 9 87
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 60.0 *
Energy digestibility, ruminants % 57.4 *
DE ruminants MJ/kg DM 10.5 *
ME ruminants MJ/kg DM 8.4 *
ME ruminants (gas production) MJ/kg DM 6.3 0.2 6.0 6.4 3

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

References

Abaunza et al., 1991; Bartha, 1970; CIRAD, 1991; Evitayani et al., 2004; Evitayani et al., 2004; González-García et al., 2008; Odedire et al., 2008; Pozy et al., 1996; Rodrigues et al., 2004; Sen et al., 1965; Vanthong Phengvichith et al., 2007

Last updated on 24/10/2012 00:44:13

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 27.5 1
Crude protein % DM 4.1 1
Crude fibre % DM 30.3 1
NDF % DM 65.8 *
ADF % DM 35.7 *
Lignin % DM 4.4 *
Ether extract % DM 0.6 1
Ash % DM 8.3 1
Gross energy MJ/kg DM 17.5 *
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 64.7 *
Energy digestibility, ruminants % 61.8 *
DE ruminants MJ/kg DM 10.8 *
ME ruminants MJ/kg DM 8.9 *
Nitrogen digestibility, ruminants % 41.5 1

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

References

Blair Ralns, 1963

Last updated on 24/10/2012 00:44:13

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 90.0 5.4 82.4 96.4 7
Crude protein % DM 3.8 2.8 1.1 9.1 7
Crude fibre % DM 41.5 4.0 35.1 47.1 7
NDF % DM 76.3 76.3 85.0 2 *
ADF % DM 48.0 48.0 55.6 2 *
Lignin % DM 7.1 7.1 11.0 2 *
Ether extract % DM 1.1 0.5 0.5 1.7 6
Ash % DM 6.3 2.2 3.9 8.9 7
Gross energy MJ/kg DM 18.4 *
 
Minerals Unit Avg SD Min Max Nb
Calcium g/kg DM 3.8 1.6 1.6 6.3 6
Phosphorus g/kg DM 1.4 1.1 0.4 3.5 6
Potassium g/kg DM 12.4 5.8 9.0 21.0 4
Sodium g/kg DM 0.1 1
Magnesium g/kg DM 1.6 0.3 1.4 1.9 4
Manganese mg/kg DM 180 1
Zinc mg/kg DM 18 1
Copper mg/kg DM 3 1
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 51.0 *
Energy digestibility, ruminants % 47.7 *
DE ruminants MJ/kg DM 8.8 *
ME ruminants MJ/kg DM 7.1 *
Nitrogen digestibility, ruminants % 11.5 1

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

References

Blair Ralns, 1963; CIRAD, 1991

Last updated on 24/10/2012 00:44:14

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 25.0 1
Crude protein % DM 5.8 1
Crude fibre % DM 37.4 1
NDF % DM 72.4 *
ADF % DM 43.5 *
Lignin % DM 6.1 *
Ether extract % DM 1.9 1
Ash % DM 7.4 1
Gross energy MJ/kg DM 18.4 *
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 57.3 *
Energy digestibility, ruminants % 53.1 *
DE ruminants MJ/kg DM 9.7 *
ME ruminants MJ/kg DM 7.9 *
Nitrogen digestibility, ruminants % 20.7 1

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

References

Blair Ralns, 1963

Last updated on 24/10/2012 00:44:14

References
References 
Datasheet citation 

DATASHEET UNDER CONSTRUCTION. DO NOT QUOTE. http://www.feedipedia.org/node/510 Last updated on November 6, 2013, 17:07

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