J. Anim Sci.
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J. Anim Sci. 1970. 31:389-393.
© 1970 American Society of Animal Science
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Plasma Levels of Growth Hormone, Insulin and Plasma Protein-Bound Iodine in Finishing Cattle1

Allen Trenkle

Iowa State University of Science and Technology, Ames2

Abstract

Growth hormone, insulin and PBI were measured in plasma samples from 30 yearling steers fed finishing rations. Insulin and PBI were measured in samples from 24 yearling heifers. Feeding of finishing rations had no effect on concentration of plasma GH. Levels of plasma insulin gradually increased while the animals were fed finishing rations. Feeding stilbestrol increased plasma GH (P<.01) in steers, increased plasma insulin in steers and heifers and had no effect on PBI. The cattle fed stilbestrol gained more weight (P<.05) and had larger pituitary glands (P<.01) than did control animals. Correlations between levels of plasma hormones and weight gain tended to be positive with insulin and negative with GH.

Footnotes

1 Journal Paper No. J-6390 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1208. This work was supported in part by the Iowa State University Research Foundation.

2 Department of Animal Science.






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