Effects of nutrient restriction on mammary cell turnover in lactating dairy cows

Abstract : 15 crossbred dairy cows divided into control (basal diet; n=7) and restricted diet (60% grass silage and 40% hay; n=8) groups. Milk yield and composition were determined, and mammary glands were removed and weighed after 11 weeks of lactation. Results revealed that milk yield was lower in restricted diet group from calving to slaughter. Restricted feeding decreased milk protein content and milk lactose content with similar milk fat composition. Mammary glands of restricted diet group cows were lighter than control. Apoptosis in the mammary gland was higher in the restricted diet animals. It is concluded that lower milk yield induced by nutrient restriction in lactating dairy cows is partly due to the lower number of mammary cells.
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Submitted on : Friday, September 7, 2012 - 3:41:46 PM
Last modification on : Wednesday, February 27, 2019 - 2:24:02 PM

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F. Dessauge, Vanessa Lollivier, L. Finot, S. Wiart, E. Cutullic, et al.. Effects of nutrient restriction on mammary cell turnover in lactating dairy cows. 3rd EAAP International Symposium on Energy and protein metabolismand Nutrition, Sep 2010, Parme (IT), Italy. pp.265-266. ⟨hal-00729493⟩

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