J. Anim Sci.
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J. Anim Sci. 1962. 21:681-687.
© 1962 American Society of Animal Science
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Ruminal Development of Lambs Related to Rates of Gain, Anabolic Estrogens, Antibiotics, Hydroxyzine and Terephthalic Acid1

H. O. Kunkel, Fehrlin E. Tutt, John C. Reagor, Hudson A. Glimp and Joe D. Robbins

A. & M. College of Texas,2 College Station

Abstract

The ventral sacs of rumina from 201 wether lambs, approximately 9–10 months old and fed a fattening ration for 72 days during a winter study, were examined for mucosal erosion, average length of papillae, and mucosal pigmentation. The effects of diethylstilbestrol (DES) implants and dietary hydroxyzine, chlortetracycline, oxytetracycline, and terephthalic acid were noted. Twenty-eight rumina were obtained from wethers placed in the feedlot as weanlings and fed 87 days in a summer feeding test of the effects of dietary hexestrol and hydroxyzine. These rumina were examined for total tissue weight, mucosal pigmentation, and papillary length and width.

Twenty-six of the lambs on the winter study showed partial ruminal erosion or desquamation and had significantly lower rates of gain. No specific dietary treatment was implicated in the incidence of ruminal desquamation.

The 3-mg. DES implant and the dietary hexestrol produced a slight but general enlargement of the papillae which was positively correlated with body weight.

Footnotes

1 The work is part of S-10 Regional Beef Cattle Breeding Project cooperative between the Southern State Experiment Stations and the United States Department of Agriculture. Supported in part by grants-in-aid from the Agricultural Division, American Cyanamid Company, New York, New York; Charles Pfizer and Company, Terre Haute, Indiana; and Armour and Company, Chicago, Illinois.

2 Departments of Biochemistry and Nutrition and of Animal Husbandry, Texas Agricultural Experiment Station.






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