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Journal of Dairy Science Vol. 52 No. 2 169-171
© 1969 by American Dairy Science Association ®
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Effect of Different Lipids in Ration of Lactating Dairy Cows on Composition of Milk1

H. P. Adams, V. R. Bohman, A. L. Lesperance and J. M. Bryant2

Animal Science Division, Max C. Fleischmann College of Agriculture, Reno, Nevada

ABSTRACT

Twelve Holstein cows were assigned to three blocks of a 4 x 4 Latin-square experimental design. The within-block treatments were: control, 1% Degras wool fat (48.3% cholesterol), 1% mixed soy sterols and a mixture of 0.5% Degras fat, and 0.5% of soy sterols of the concentrate mixture. The concentrates between blocks contained no added fat, 10% animal tallow, or 10% vegetable oil. Milk fat production, fat test, and fat-corrected milk production were highest when no sterol was added to the ration. Percentages solids-not-fat, milk cholesterol, and blood fat were apparently not affected by the different sterols. However, cows had lower blood cholesterol when a mixture of animal and plant sterols was fed compared to other groups.

Milk production, milk fat production, fat-corrected milk, blood fat, and blood cholesterol were significantly higher when either tallow or vegetable oil was fed. However, milk fat test was significantly lower. Milk fat production, solids-not-fat, and milk cholesterol were not significantly affected by fat source.

FOOTNOTES

1 Contribution from Agricultural Experiment Station, University of Nevada Journal Series no. 98.

2 Present address: Animal Science Department, Washington State University, Pullman. This work supported in part by VioBin Corp., Monticello, Illinois.






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Copyright © 1969 by the American Dairy Science Association ®.