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Animal feed resources information system
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Feedipedia

Winged yam (Dioscorea alata)

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 
Greater yam, guyana arrowroot, ten months yam, water yam, white yam, winged yam, yam, grande igname, igname ailée, igname de Chine, geflügelter yam, wasser yamswurzel, inhame, ñame blanco, ñame de agua, tabena
Synonyms 
Dioscorea rubella Roxb.
Related feed(s) 
Description 
The most important of the cultivated varieties of yam. The white, brown or brownish red root tubers are very large, sometimes over 2 m in length, penetrating deep into the soil. The water content of the tubers is high. The stem is a climbing type with leaves 0-20 cm long.
Nutritional aspects
Nutritional attributes 
Growing yam for animal feed is seldom economic, but yam can be used where surpluses are available. The peels are a valuable cattle feed. The tubers of all other types are more palatable cooked than raw, because cooking destroys the poisonous bitter alkaloid dioscorene.
Potential constraints 
The tuber contains dioscorene, a poisonous bitter alkaloid.
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 24.1 1
Crude protein % DM 12.0 1
Crude fibre % DM 25.3 1
Ether extract % DM 2.3 1
Ash % DM 7.9 1
Gross energy MJ/kg DM 18.3 *
 
Minerals Unit Avg SD Min Max Nb
Calcium g/kg DM 9.5 1
Phosphorus g/kg DM 1.6 1

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

References

Lim Han Kuo, 1967

Last updated on 24/10/2012 00:45:23

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 25.9 1
Crude protein % DM 11.7 1
Crude fibre % DM 6.6 1
Ether extract % DM 1.0 1
Ash % DM 9.5 1
Gross energy MJ/kg DM 16.8 *
 
Pig nutritive values Unit Avg SD Min Max Nb
Energy digestibility, growing pig % 79.7 *
DE growing pig MJ/kg DM 13.4 *

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

References

Oyenuga, 1968

Last updated on 24/10/2012 00:45:23

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 29.8 25.4 34.2 2
Crude protein % DM 8.9 8.1 9.7 2
Crude fibre % DM 2.6 1
ADF % DM 10.7 1
Ether extract % DM 0.8 1
Ash % DM 5.1 4.9 5.2 2
Gross energy MJ/kg DM 17.2 *
 
Minerals Unit Avg SD Min Max Nb
Calcium g/kg DM 0.6 0.1 1.2 2
Phosphorus g/kg DM 1.7 0.1 1.6 1.8 3
Potassium g/kg DM 16.0 1
Sodium g/kg DM 0.2 1
 
Pig nutritive values Unit Avg SD Min Max Nb
Energy digestibility, growing pig % 86.0 *
DE growing pig MJ/kg DM 14.8 *

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

References

Cerning-Beroard et al., 1976; Oyenuga, 1968; Ravindran et al., 1994

Last updated on 24/10/2012 00:45:24

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 26.2 1
Crude protein % DM 7.3 1
Crude fibre % DM 2.3 1
Ether extract % DM 0.6 1
Ash % DM 5.2 1
Gross energy MJ/kg DM 17.0 *
 
Pig nutritive values Unit Avg SD Min Max Nb
Energy digestibility, growing pig % 86.5 *
DE growing pig MJ/kg DM 14.7 *

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

References

Oyenuga, 1968

Last updated on 24/10/2012 00:45:24

References
Datasheet citation 

DATASHEET UNDER CONSTRUCTION. DO NOT QUOTE. http://www.feedipedia.org/node/540 Last updated on March 16, 2010, 17:13

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