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Serum Growth Hormone Levels of Pigs Fed Diethylstilbestrol Plus Methyltestosterone between 23 and 90 Kilograms¹

Michigan State University, East Lansing 48823

Abstract

Serum GH was determined on 80 Yorkshire pigs ranging from 23 to 90 kg live weight. After 56 days of feeding 2.2 mg diethylstilbestrol (DES) plus 2.2 mg methyltestosterone (MT) in experiment 1, serum GH of treated pigs, especially barrows, was significantly (P<.01) higher than controls. After a corresponding period in experiment 2, serum GH of hormone-treated barrows was also significantly higher than controls, but hormone treatment did not influence GH in gilts. The only significant correlations between serum GH and growth or carcass characteristics were negative.

¹ Published with the approval of the Director of the Agricultural Experiment Station as paper No. 5915. This study was supported in part by research grants from Eli Lilly and Company, Greenfield, Indiana and American Meat Institute Foundation. Chicago, Illinois.

² Present address: Department of Animal Science, Louisiana State University, Baton Rouge 70803.

³ Department of Animal Husbandry.

⁴ Department of Food Science and Human Nutrition.

⁵ Department of Dairy Science.

⁶ Present address: Department of Animal Science, Oregon State University, Corvallis 97331.