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Effect of nature of forage on spontaneous lipolysis in milk from cows in late lactation

Published online by Cambridge University Press:  01 June 2009

Marie-Paule Chazal ,
Yves Chilliard  and
Jean-Baptiste Coulon
Marie-Paule Chazal
Affiliation:
Laboratoire de la Lactation, INRA, Theix 63122 Ceyrat, France
Yves Chilliard
Affiliation:
Laboratoire de la Lactation, INRA, Theix 63122 Ceyrat, France
Jean-Baptiste Coulon
Affiliation:
Laboratoire de la Lactation, INRA, Theix 63122 Ceyrat, France
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Summary

Levels of free fatty acids (FFA) were determined in milk from cows after 7 months of lactation and 4 months of pregnancy immediately after milking (initial FFA) and after 22 h storage at 4 °C (FFA-22). During the pre-experimental period, cows were at pasture. When housed indoors (experimental period) they were fed hay or grass silage for 3 weeks. Then all cows received grass silage for 3 weeks (post-experimental period). Feeding hay did not increase FFA-22 content in milk compared with pasture, but grass silage feeding enhanced FFA-22 content in milk compared with pasture (+130 %) or hay (+93 %). Increased lipolysis with grass silage was not due to underfeeding of the cows because grass silage and hay were both of high nutritive value. As pasture, hay and grass silage were of the same type (native mountain grassland), the high level of lipolysis occurring with grass silage probably resulted from the method of forage conservation.

Type
Original Articles
Information
Journal of Dairy Research , Volume 54 , Issue 1 , February 1987 , pp. 13 - 18
Copyright
Copyright © Proprietors of Journal of Dairy Research 1987

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References

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