J. Anim Sci.
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J. Anim Sci. 1974. 39:601-605.
© 1974 American Society of Animal Science
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Pituitary Gonadotropins in Boars as Affected by Dietary Protein and Age

T. G. Althen1, R. J. Gerrits2 and E. P. Young3

U. S. Department of Agriculture, Beltsville 20705 and University of Maryland, College Park 20740

Abstract

Twenty-four Hampshire x Yorkshire boars were fed diets containing 10, 15, or 20% protein. Three boars from each protein level were slaughtered at 230 days and the remaining boars at 365 days of age. The significant increase in follicle stimulating hormone and the trend towards an increase in interstitial cell stimulating hormone with greater protein intake suggest that dietary protein can affect pituitary gonadotropin content during development up to 230 days of age. Protein level had no effect on reproductive organ weights, seminiferous tubule diameter or epididymal sperm numbers. There was a trend toward lower gonadotropin levels at 365 days of age. Reproductive organ weights at the two ages were not different except that testicles were smaller at 365 days than at 230 days of age. Reproductive development was concluded by 230 days of age and after this age, the 10% protein diet was utilized without detrimental affects on pituitary gonadotropin content and reproductive organ weights.

Footnotes

1 Livestock and Meat Marketing Laboratory, Agricultural Marketing Research Institute, Agricultural Research Service, Beltsville, Maryland 20705.

2 National Program Staff, Livestock and Veterinary Sciences, Agricultural Research Service, Beltsville, Maryland 20705.

3 Department of Animal Science, University of Maryland, College Park, Maryland 20740.






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Copyright © 1974 by the American Society of Animal Science.