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Effect of Metabolisable Protein on intake of grass silage and milk protein yield in dairy cows.

Published online by Cambridge University Press:  21 November 2017

J.R. Newbold ,
B.R. Cottrill ,
R.M. Mansbridge  and
J.S. Blake
J.R. Newbold
Affiliation:
BOCM Pauls Ltd, 47 Key Street, Ipswich, Suffolk, IP4 1BX
B.R. Cottrill
Affiliation:
ADAS Wolverhampton, Wolverhampton, WV6 8TQ
R.M. Mansbridge
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, S021 1AP
J.S. Blake
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, S021 1AP
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Extract

Few data are available to evaluate the Metabolisable Protein (MP) System (AFRC, 1992) as an aid to ration formulation for dairy cows. Responses of lactating dairy cows to MP were evaluated in two experiments.

In Experiment One, groups of 10 Holstein cows were offered grass silage ad libitum and 7kg DM/d of one of six (treatments 1-6) compound foods from 39d after calving, for eight weeks. All rations were isoenergetic, assuming silage intake of 11kg DM/d (typical for the herd). Ratios between MP supply (calculated from in situ protein degradability measurements) and requirement (calculated for a standard cow: 565kg live weight, 281 milk/d, 40g/kg butterfat, 33g/kg milk protein, liveweight change =0kg/d) were 1.00, 1.02, 1.06, 1.06, 1.1 and 1.17 for treatments 1-6, respectively.

Type
Ruminant Nutrition and Digestion
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1994 , March 1994 , pp. 113
Copyright
Copyright © The British Society of Animal Production 1994

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References

AFRC (1992) Technical Committee on Responses to Nutrients, Report No. 9. Nutritive Requirements of Ruminant Animals: Protein. Nutrition Abstracts and Reviews (Series B) 62: 787–835 Google Scholar