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The influence of carbohydrate source and concentration of crude protein in a concentrate given with grass silage ad libitum on the performance of autumn-calving Holstein-Friesian cows

Published online by Cambridge University Press:  24 November 2017

K.Aston ,
C.Thomas ,
R.D.Baker ,
P.M.Hughes  and
S.R.Daley
K.Aston
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
C.Thomas
Affiliation:
Scottish Agricultural Colleges, Auchincrulve, Ayr, Scotland KA6 5HW
R.D.Baker
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
P.M.Hughes
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
S.R.Daley
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
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Extract

Carbohydrates in dairy concentrate originate from cereals containing high starch and a variety of by-products with high levels of fibre. Selection is based on unit cost and chemical analysis. Comparisons between starchy and fibrous sources were made at a single level of crude protein (CP) by Thomas et al (1986) and Sutton et al (1987). Voluntary intake of forage increased and yields of fat and protein were similar when fibre replaced starch. The objective of this trial was to extend the range of comparisons by establishing the effects of three types of carbohydrate at four levels of crude protein given with grass silage ad libitum to lactating dairy cows.

Type
Dairy Cow Metabolism and Nutrition
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 99
Copyright
Copyright © The British Society of Animal Production 1992

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References

Sutton, J.D., Bines, J.A., Morant, S.V., Napper, D.J. and Givens, D.I. (1987). J.agrie. Sci. Comb. 109, 375–386.CrossRefGoogle Scholar
Thomas, C, Aston, K., Daley, S.R. and Bass, J. (1986). Anim. Prod. 42: 315–325.Google Scholar