J. Anim Sci.
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J. Anim Sci. 1969. 29:678-686.
© 1969 American Society of Animal Science
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Monte Carlo Studies of Selection and Inbreeding in Swine I. Genetic and Phenotypic Trends1

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

United States Department of Agriculture and Iowa State University, Ames

Abstract

The development of Mendelian Genetics shortly after 1900 led to the view that inbreeding decline in plant and animal populations was due to an increasing frequency of deleterious recessive mutants in the homozygous state. It was further speculated that by developing a number of inbred lines, segregation in hereditary differences among the lines would result. However, animal breeding theory remained largely rudimentary and the experiments elementary until a series of classic papers by Sewall Wright on quantitative genetic theory (Wright, 1921, 1922) were published.

Wright's papers did much to stimulate inbreeding studies with swine at various agricultural experiment stations. At the Iowa station, Lush (Lush et al., 1948) interpreted Wright's theories to indicate that a balance might be achieved whereby the simultaneous, conflicting effects of inbreeding and selection might cancel each other, permitting the slow attainment of genetic homozygosity without a deterioration of phenotype. To test this, an experiment was started in 1930 in which responses to maximum possible intraline selection under regimes of intense, mild and very slight inbreeding were compared.

Footnotes

1 The authors express appreciation for useful advice by H. T. Fredeen of the Canada Dept. of Agriculture and by Professors A. E. Freeman and J. L. Lush of Iowa State University, D. D. Kratzer of the University of Kentucky, H. W. Norton of the University of Illinois and L. A. Swiger of Ohio State University.

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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