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Protein Protected Fat for Ruminants 1. Digestion and Performance in Fattening Steers^{1, 2, 3,}

University of Arizona, Tucson 85721

Abstract

A digestion and performance trial was conducted with 11 individually fed steers receiving an 80% concentrate fattening ration to determine utilization of a formaldehyde treated, spray dried casein:safflower oil homogenate (50% casein:50% safflower oil). The control ration (treatment 1) containing 6% formaldehyde treated casein was fed to three steers. Three steers were fed a ration containing 6% formaldehyde treated casein plus 6% safflower oil (treatment 2) and five steers were fed a ration containing 12% of the formaldehyde treated spray dried casein:safflower oil homogenate (treatment 3).

Dry matter digestibility was lowest for treatment 2 (P < .05) and highest for treatment 3. Gross energy digestibility was lower (P < .05) for treatment 2 than the other two treatments, lipid digestibility was lowest on treatment 2 and highest on treatment 3; however, the differences were not significant (P > .05). Safflower oil digestibility as calculated by difference was 69% for treatment 3 compared to 41% for treatment 2.

¹ Arizona Agricultural Experiment Station Technical Paper 2244.

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 Corporation, Philadelphia, Pennsylvania through the courtesy of Dr. John E. Trei.