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The Journal of Heredity 1985:76(1):36-38
© 1985 The American Genetic Association 76:36-38

research-article

Sex ratio and distribution of sexes in swine

Elmer Gray, and Manouchehr N. Katanbaf

The authors are, respectively, professor of agriculture and dean of the Graduate College; and graduate student. Department of Agriculture, Western Kentucky University, Bowling Green, KY 42101. Sincere appreciation is expressed to Mr. Glen Conatser, Executive Secretary, American Yorkshire Club, West Lafayette, IN 47906; and Mr. Jack Wall, Executive Secretary, American Berkshire Association, Lebanon, IN 46502 for providing acccess to the data. Special thanks are extended to Ms. Christine C. Jenkins, Graduate College, Western Kentucky University, for transcribing the data and for critical reading of the manuscript.

Abstract

Studies of sex ratio and distribution of sexes in swine were based on the offspring of 1020 sows from each of two breeds: Berkshire and Yorkshire. The offspring included 32 726 pigs (3942 litters) In the Berkshire breed and 26 995 (2876 litters) In the Yorkshire breed. Secondary sex ratios (percentage males) were 49.84 and 50.74 for the Berkshires and Yorkshires, respectively. Although there were variations among sex ratios for individual parities within each breed, there were no consistent differences. Independence of sex ratios was further evidenced by the lack of associations between sex ratios of successive and nonsuccessive parities and by general agreements between observed and expected frequencies of combinations of sexes within various litter sizes. There was limited evidence of interactions among the sex ratios and distribution of sexes; however, those departures from Independence provided little evidence that the sex ratio and distribution of sexes could be successfully altered through selection.


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