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The effects on milk yield and composition of incorporating lactose into the diet of dairy cows given protected fat

Published online by Cambridge University Press:  02 September 2010

P. C. Garnsworthy
P. C. Garnsworthy
Affiliation:
University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD
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Abstract

Twenty-eight Holstein/Friesian dairy cows were divided into four groups of seven. From weeks 4 to 15 of lactation they were given a basal diet consisting of 8 kg hay, 2 kg sugar-beet feed and 2 kg grass nuts, together with a concentrate allowance of 8 kg/day. Concentrates for group A were based on cereals and soya (control). Concentrate B contained 60 g protected fat supplement per kg; concentrate C contained 100 g lactose per kg; concentrate D contained 60 g fat supplement and 100 g lactose per kg. Milk yields were 24·6, 27·7, 25·6 and 26·5 kg/day and milk protein concentrations were 32·3, 30·7, 32·7 and 31·9 g/kg for groups A, B, C and D respectively. The effect of fat supplementation on milk yield and protein concentration was significant (P < 0·05) but the effect of lactose was not significant. Milk fat concentration was not significantly affected by treatment. It is concluded that lactose can partially alleviate the depression in milk protein concentration often observed when cows are given protected fat.

Keywords

dairy cowslactosemilk proteinmilk yieldprotected fat
Type
Research Article
Information
Animal Science , Volume 62 , Issue 1 , February 1996 , pp. 1 - 3
Copyright
Copyright © British Society of Animal Science 1996

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