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The Effects of Dietary Fat on the Yield and Relative Proportions of Different Milk Protein Fractions From Dairy Cows

Published online by Cambridge University Press:  21 November 2017

J.M. Moorby ,
R.J. Dewhurst  and
S. Marsden
J.M. Moorby
Affiliation:
Grassland and Ruminant Science Department, SAC Auchincruive, Ayr KA6 5HW
R.J. Dewhurst
Affiliation:
Grassland and Ruminant Science Department, SAC Auchincruive, Ayr KA6 5HW
S. Marsden
Affiliation:
Dalgety Agriculture Limited, 180 Aztec West, Almondsbury, Bristol BS12 4TH
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Extract

The inclusion of supplementary fat in the dairy cow diet is an effective and cheap method of increasing its metabolisable energy (ME) density. However, an increase in the fat content of the diet frequently causes a decrease in the protein concentration of milk, which, when the market requires an increase in the protein:fat ratio of milk, is not a desireable effect. This experiment was designed to compare die effect of dietary fat on die yield and concentrations of milk proteins in comparison to a carbohydrate ME source.

Twelve multiparous mid-lactation Holstein-Friesian cows were used in a 3x3 Latin square changeover experiment with 3 four-week periods. Cows were allocated to squares on the basis of their mean milk yield over the 7 days prior to the experiment. Within squares, treatments were randomly allocated to each cow. The first 21 days of each experimental period were used for adjustment, and the last 7 for sample collection.

Type
Milk Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1994 , March 1994 , pp. 37
Copyright
Copyright © The British Society of Animal Production 1994

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References

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