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Response by dairy cows to a change in concentrate energy supply with equal supply of concentrate crude protein

Published online by Cambridge University Press:  24 November 2017

E.J. Smith ,
G.C. Emmans ,
N. Friggens ,
J.D. Oldham ,
D.A. Whitaker ,
K. Aitchison  and
J.M. Kelly
E.J. Smith
Affiliation:
Dept. of Veterinary Clinical Studies, Royal (Dick)School of Veterinary Studies, Easter Bush, Nr. Roslin, Midlothian. EH25 9RG
G.C. Emmans
Affiliation:
Edinburgh School of Agriculture, West Mains Road, Edinburgh, EH9 3JL
N. Friggens
Affiliation:
Edinburgh School of Agriculture, West Mains Road, Edinburgh, EH9 3JL
J.D. Oldham
Affiliation:
Edinburgh School of Agriculture, West Mains Road, Edinburgh, EH9 3JL
D.A. Whitaker
Affiliation:
Dept. of Veterinary Clinical Studies, Royal (Dick)School of Veterinary Studies, Easter Bush, Nr. Roslin, Midlothian. EH25 9RG
K. Aitchison
Affiliation:
Dept. of Veterinary Clinical Studies, Royal (Dick)School of Veterinary Studies, Easter Bush, Nr. Roslin, Midlothian. EH25 9RG
J.M. Kelly
Affiliation:
Dept. of Veterinary Clinical Studies, Royal (Dick)School of Veterinary Studies, Easter Bush, Nr. Roslin, Midlothian. EH25 9RG
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Extract

When concentrate allowance is changed the allowances of both energy and crude protein change. In this experiment, which was part of a larger series, concentrate energy supply was increased at a constant supply of crude protein.

Sixteen Ayrshire and Friesian cows were given either 4kg/d of a high protein concentrate (321g/kg DM), T4, or 8kg/d of a low protein concentrate (173g/kg DM), T8, as well as ad. libitum access to silage through Calan-Broadbent gates (pH 3.8, DM 220g/kg, ME 10.1 MJ/kg DM, CP 147g/kg DM, NH3-N 43g/kg total N). There were two periods of 8 weeks starting three weeks after calving. Performance in week two was used as a covariate. The treatments in the two periods were: T4/T4, T4/T8, T8/T4 and T8/T8. Milk yields and silage intakes were recorded daily; milk composition was measured weekly and cows were weighed twice weekly by weighband.

Type
Dairy Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1990 , March 1990 , pp. 127
Copyright
Copyright © The British Society of Animal Production 1990

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