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Journal of Dairy Science Vol. 75 No. 9 2463-2472
© 1992 by American Dairy Science Association ®
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Fatty Acids, Calcium Soaps of Fatty Acids, and Cottonseeds Fed to High Yielding Cows

D. Sklan 1, Ruth Ashkenazi 1, A. Braun 1, A. Devorin 1, and K. Tabori 1

1 Faculty of Agriculture, Hebrew University, Rehovot, Israel 76100

We examined the effects of dietary fat as cottonseed, fatty acids, or calcium soaps of fatty acids in the rations of high yielding lactating cows receiving low forage. Experiments were with isoenergetic, isonitrogenous diets containing equal amounts of forage. Inclusion of up to 510 g/d of fatty acids in the ration enhanced FCM yield. With cottonseed, increased FCM was mainly due to increased fat yield. Dietary fatty acids tended to increase milk in mid and late lactation and to decrease fat percentage. Calcium soaps of fatty acids enhanced FCM, particularly in early lactation. Feeding cottonseed and fatty acids together did not enhance yield. Effects described may be attributed in part to changes in ruminal fermentation in which cottonseed increased acetate concentrations and fatty acids decreased the ratio of acetate and butyrate to propionate and in part to enhanced efficiency of milk yield when fat was included in the ration.

Key Words: fatty acids • calcium soaps • cottonseed • milk yield

Submitted on January 28, 1992
Accepted on April 10, 1992




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