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Protein Protected Fat for Ruminants II. Serum Lipids and Lipoproteins^{1, 2, 3,}

University of Arizona, Tucson 85721

Abstract

Qualitative and quantitative serum lipid and lipoprotein data were obtained from 11 steers fed an 80% concentrate fattening ration according to the following treatments: (1) control ration containing 6% formaldehyde treated casein (three steers), (2) basal ration supplemented with 6% formaldehyde treated casein plus 6% safflower oil (three steers), and (3) basal ration supplemented with 12% of a formaldehyde treated spray dried caseimsafflower oil homogenate (five steers).

The serum lipid level for the steers consuming the protected safflower oil diet from 112 to 168 days of the experiment was significantly greater (P < .05) than that of either the control steers or those supplemented with unprotected safflower oil which did not differ (P > .05). On the final period, steers consuming the protected safflower oil product had an average serum lipid level of approximately 930 mg/100 ml serum which was 2.1 times greater than the control animals and 1.7 times greater than the animals supplemented with unprotected safflower oil.

¹ Arizona Agricultural Experiment Station Technical Paper 2243

² This study was supported in part by a grant from Fats and Protein Research Foundation, Inc., Des Plaines, Illinois

³ The spray dried casein:safflower oil homogenate was prepared by SmithKline Corp., Philadelphia, Pennsylvania through the courtesy of Dr. John E. Trei.