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The effect of animal species on the ruminal degradation of dry matter and nitrogen fractions in urea-treated whole-crop wheat

Published online by Cambridge University Press:  27 February 2018

A. T. Adesogan ,
A. L. Abdalla ,
M. S. Dhanoa ,
D. I. Givens ,
E. Owen  and
J. D. Sutton
A. T. Adesogan
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT ADAS Feed Evaluation and Nutritional Sciences, Alcester Road, Stratford-upon-Avon CV37 9RQ
A. L. Abdalla
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT
M. S. Dhanoa
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB
D. I. Givens
Affiliation:
ADAS Feed Evaluation and Nutritional Sciences, Alcester Road, Stratford-upon-Avon CV37 9RQ
E. Owen
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT
J. D. Sutton
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT
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Extract

At maintenance at least, the whole tract digestibility of several foods in sheep and cattle is similar, consequently much of the information on the nutritive value of dairy cow foods in food composition tables is derived from studies conducted in sheep. However, Adesogan (1996) reported that in whole-crop wheat (WCW), starch digestibility is higher in sheep than in dairy cows. This study examined the validity of using sheep to model the ruminal degradation of WCW in cows by comparing the degradability of dry matter (DM) and nitrogen (N) of urea-treated WCW in both species.

Winter wheat (cv. Hussar) was harvested at 540 g DM per kg and conserved following urea application at target rates of 20 or 40g/kg DM (WCW2 and WCW4 respectively). The degradability of the forages was examined in dairy cows given 6 kg dairy concentrate and grass silage ad libitum and in wethers given 2.4 kg/day of grass silage supplemented with 0.36kg/day of rolled, mineralized barley.

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Information
BSAP Occasional Publication , Volume 22: In vitro techniques for measuring nutrient supply to ruminants , 1998 , pp. 326 - 328
Copyright
Copyright © British Society of Animal Science 1998

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References

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