J. Anim Sci.
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J. Anim Sci. 1962. 21:716-719.
© 1962 American Society of Animal Science
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Effect of Oxytetracycline, Stilbestrol, and Pelleted Feed on Fattening Whiteface and Blackface Crossbred Wether Lambs1,2,

J. E. Butcher and R. J. Raleigh3

Utah Agricultural Experiment Station, Logan

Abstract

An experimental design with factorially arranged treatments was used to test two levels of oxytetracycline, two levels of stilbestrol, pelleted versus chopped feed, and whiteface versus blackface crossbred lambs. One hun|dred and twenty-eight (pair fed) lambs were used to measure weight gain, feed consump|tion, carcass grade, and yield. The greatest response was due to the increased feed con|sumption and body weight gain of the pellet-fed lambs. Covariance analysis indicated that the increased gain was almost entirely due to the increased feed consumption. Heavier lambs gave the best results from pellet feeding. Oxytetracycline and stilbestrol both increased body weight gain, which was independent of feed consumption. The use of stilbestrol resulted in a higher rate gain with the blackface crossbred lambs than with the whiteface lambs. The blackface crossbred carcasses graded and yielded better than the whitefaces. Stilbestrol fed lambs had a lower dressing percent.

Footnotes

1 Published with the approval of the director of the Utah Agricultural Experiment Station as Journal Paper No. 233.

2 The lambs and feed for this study were furnished by the Paradise Land and Livestock Company; L. C. Kearl and Sons mixed and pelleted the feed; Chas. Pfizer and Co., Inc. furnished the oxytetracycline and a grant-in-aid; Eli Lilly and Co. furnished the stilbestrol; L. E. Harris assisted in the planning; and Howard Lloyd and Rex Sandberg assisted in the care of the sheep.

3 Present address: Squaw Butte Experiment Station, Burns, Oregon.






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