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The relative importance of the amounts of energy and crude protein in the concentrate ration on intake and yields of milk constituents by autumn-calving Holstein-Friesian cows given grass silage ad libitum

Published online by Cambridge University Press:  24 November 2017

K. Aston ,
J.D. Sutton ,
R.D. Baker  and
W.J. Fisher
K. Aston
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
J.D. Sutton
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
R.D. Baker
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
W.J. Fisher
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
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Extract

The response in yields of milk constituents to increases in the amounts of standard dairy concentrate (SC, 200 g crude protein (CP) per kg DM) given to cows consuming grass silage ad libitum were reported recently (Aston et al 1991; Baker et al 1991). A change of level however adjusts the supply of both energy and CP. Previous work also showed .linear responses in silage intake and milk and milk protein yields when CP was increased in a fixed ration of concentrate of constant energy value. In this trial energy and CP levels were varied Independently. The objective was to separate the effects of energy on the performance of lactating cows from those of CP.

Type
Dairy Cow Metabolism and Nutrition
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 98
Copyright
Copyright © The British Society of Animal Production 1992

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References

Aston, K., Fisher, W.J., and Baker, R.D. (1991) Anim. Prod. 52: 588 (Abstr.).Google Scholar
Baker, R.D., Aston, K., Thomas, C, and Fisher, W.J. (1991) Anim. Prod. 52: 586 (Abstr.).Google Scholar