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Plasma Thyroid Hormones, Growth and Carcass Measurements of Genetically Obese and Lean Pigs as Influenced by Thyroprotein Supplementation

U.S. Department of Agriculture^{,2, 3,}, Clay Center, NE 68933

Abstract

A 2 x 2 factorial arrangement with two genotypes of pigs (genetically obese and lean) and two dietary treatments (basal, a 16% protein corn-soybean meal standard grower diet, and basal + 220 ppm thyroprotein as iodinated casein) was used. The 28 gilts were housed individually and fed ad libitum from 121 d of age until slaughtered-at 99 kg body weight. Compared with lean pigs, genetically obese pigs had significantly lower average daily gain and gain/feed, greater backfat thickness, smaller loin eye area, shorter carcass length and lower circulating plasma triiodothyronine (T₃) concentration. However, both total plasma and free thyroxine (T₄) concentrations were similar comparing obese and lean pigs. Supplementation with thyroprotein increased circulating plasma concentration of both total and free T₄ and produced interactions with genotype in affecting daily gain and gain/feed of pigs. Thyroprotein reduced both daily gain and gain/feed in obese pigs, but increased daily gain and gain/feed in lean pigs. It is suggested, similar to the case with obese mice, that heat production of our genetically obese pigs may be more sensitive to thyroprotein administration compared with similar treatment of lean animals.

¹ The authors are grateful to Dr. E. R. Peo, Jr., Univ. of Nebraska, Lincoln, Nebraska, for providing iodinated casein; Dr. Ron Lindvall, Jenell Dague and associates for animal feeding and care; Bob Lee, L. H. Yen, Sue Pittman and Mickie Deterding for technical assistance and Sherry Hansen for stenographic work.

² Mention of a trade name, proprietary product or vendor does not constitute a guarantee or warranty by the USDA and does not imply its approval of the exclusion of other products or vendors that may be suitable.

³ Agricultural Research Service, Roman L. Hruska U.S. Meat Animal Research Center.

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