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Influence of different energy supplements on nitrogen utilisation by dairy cows fed grass silage diets

Published online by Cambridge University Press:  20 November 2017

A.R. Castillo
Affiliation:
Centre for Dairy Research, Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT, UK
J.H. Barbi
Affiliation:
Centre for Dairy Research, Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT, UK
D.E. Beever
Affiliation:
Centre for Dairy Research, Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT, UK
J.D. Sutton
Affiliation:
Centre for Dairy Research, Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT, UK
D.J. Humphries
Affiliation:
Centre for Dairy Research, Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT, UK
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Extract

The efficiency of nitrogen (N) utilisation in dairy cows fed grass silage diets is normally low and is related to an impaired utilisation of N in the rumen. Choice of carbohydrate type may affect this efficiency, influencing milk production and composition, and changing the output of N in faeces or urine. This experiment was undertaken to examine the effect of different iso-energetic supplements containing contrasting energy sources on N utilisation and milk production in early/mid lactation dairy cows fed early cut partially wilted grass silage.

Six iso-energetic supplements were formulated as treatments; four to contain 160 g CP/kg DM and contrasting carbohydrate sources, viz.: neutral detergent fibre (NDF; wheatfeed, 350 g/kg, molassed and unmolassed sugar beet pulp 412 g/kg); low degradability starch (LDS; maize grain 500 g/kg, wheat 237 g/kg); high degradability starch (HDS; wheat and barley grain 812 g/kg); and soluble sugars (SS; molasses, 525 g/kg, citrus pulp, 125 g/kg).

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Copyright
Copyright © The British Society of Animal Science 1999

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