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The effects of a low-protein food supplement on the yield and composition of milk from grazing dairy cows and on the composition of their diet

Published online by Cambridge University Press:  27 March 2009

J. L. Corbett  and
A. W. Boyne
J. L. Corbett
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeenshire
A. W. Boyne
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeenshire
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Extract

1. Dried molassed sugar-beet pulp was fed to dairy cows grazing abundant intensively managed pastures in two trials (spring and autumn), each of 8 weeks' duration. A change-over design (four 14-day periods) with twenty-four cows was employed in each trial. Apart from six changes for the autumn trial, the same cows were used throughout.

2. In the spring trial (May–July) 8 lb. beet pulp were fed daily. The herbage dry matter consumed contained, on average, 16·8% crude protein, and the general mean milk yield was 38 lb./cow/day. The milk yield of the supplemented cows was 1·3 lb. (3·7%) greater than that of the control animals (P < 0·05).

3. In the autumn trial (August–October) 10 lb. beet pulp were fed daily. The herbage dry matter consumed contained 23·8% crude protein and the general mean milk yield was 27 lb./cow/day. The milk yield of the supplemented cows was 2·9 lb. (11·3%) greater than that of the control animals (P < 0·001).

Type
Research Article
Information
The Journal of Agricultural Science , Volume 51 , Issue 1 , August 1958 , pp. 95 - 107
Copyright
Copyright © Cambridge University Press 1958

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