J. Anim Sci.
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J. Anim Sci. 1970. 30:681-689.
© 1970 American Society of Animal Science
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Monte Carlo Studies of Selection and Inbreeding in Swine. II. Inbreeding Coefficients1

B. Bereskin2, C. E. Shelby2 and L. N. Hazel3

U. S. Department of Agriculture and Iowa State University, Ames

Abstract

Originally, Wright (1921, 1922) proposed the quantity, F, as an inbreeding coefficient indicating "the departure from the amount of homozygosis under random mating to complete homozygosis." F has since been used as a measure of such departure relative to a specified foundation stock, not necessarily random-bred (Wright, 1951). The most important inbreeding coefficient (Wright, 1951, 1955) and the one of concern here is the F-value pertaining to neutral autosomal disomic loei. In the strictest sense, F measures the changes in homozygosis (or, homozygosity) due only to parental relationship. Malecot (1948) showed that these changes in homozygosity also can be expressed in terms of probability.

In biological populations, "true" F usually is indeterminable. The inbreeding coefficient, Fp, here, computed from parental relationships, commonly is used as an estimate of F (Wright, 1922; Lush, 1948). More information is needed on its correspondence with the actual state of homozygosity of an individual or population, particularly as it is affected by type of gene action and selection practices.

Footnotes

1 Appreciation is expressed to Professors J. L. Lush of Iowa State University, Ames, and H. W. Norton of the University of Illinois, Urbana, for detailed suggestions on the manuscript. Comments by Professor L. A. Swiger of Ohio State University, Columbus, and statistical advice by Professor David Jowett of Iowa State University, Ames, also are acknowledged.

2 Regional Swine Breeding Laboratory, A.H.R.D., A.R.S., with headquarters at Ames, Iowa.

3 Animal Science Department, Iowa State University, Ames.






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