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Journal of Dairy Science Vol. 68 No. 3 669-680
© 1985 by American Dairy Science Association ®
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Influence of Triglycerides and Free Fatty Acids in Milk Replacers on Calf Performance, Blood Plasma, and Adipose Lipids1

K. J. Jenkins2, J.K.G. Kramer2, F. D. Sauer2 and D. B. Emmons3

Research Branch, Agriculture Canada, Ottawa, Ontario, K1A OC6, Canada

ABSTRACT

In a 4-wk study of 48 3-day-old calves we compared effects of feeding various fats or their free fatty acids in skim milk-powder based milk replacer, on calf performance, feed utilization, and blood plasma and adipose lipids.

When fat was fed, calf performance and feed utilization were equivalent for tallow and coconut oil diets but markedly poorer for corn oil. Complete replacement (tallow) or one-half replacement (coconut and corn oils) of the fats with their free fatty acids reduced calf gains and feed efficiency. Tallow free fatty acids gave lower digestibilities of palmitic and stearic acid and reduced calcium absorption. Free fatty acids from both coconut and corn oils reduced diet palatability and intake; those from tallow and coconut oil markedly interfered (in vitro) with rennet clotting of milk replacers. The main lipid classes in blood plasma for all treatments were cholesteryl esters and phosphatidylcholine. High concentrations (56 to 87%) of linoleic acid occurred in cholesteryl esters for all diets despite low concentrations of linoleic acid in the tallow and coconut oil diets.

FOOTNOTES

1 Contribution Number 1267 of the Animal Research Centre and Contribution Number 601 of the Food Research Institute.

2 Animal Research Centre.

3 Food Research Institute.






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Copyright © 1985 by the American Dairy Science Association ®.