J. Anim Sci.
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J. Anim Sci. 1968. 27:848-855.
© 1968 American Society of Animal Science
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Quantitative Studies on Blood Group and Serum Protein Systems in Pigs. I. Segregation Ratios and Gene Frequencies1

C. Smith, E. L. Jensen, L. N. Baker and D. F. Cox

Iowa State University, Ames

Abstract

Segregation data of progeny from known matings were studied for 12 blood group systems and five serum polymorphisms in two breeds of pigs. A total of some 16,000 pigs from 429 sires was available. The viability of different phenotypes in each system was compared for all pigs alive at 154 days of age. Most of the segregation numbers did not differ significantly from expectation showing that: (1) inheritance was Mendelian, (2) typing was accurate, and (3) any differences in viability from conception through birth to 154 days, are less than the 5 to 10% level detectable (P<=0.05) by these experimental data. In cases showing significant deviations (14 out of 275 mating types), the results were inconsistent among mating types and between breeds. Homozygotes and heterozygotes had similar viabilities.

Most of the systems are truly polymorphic in that the alleles have non-trivial frequencies and occur in several breeds. Trends in gene frequency which could reflect changes in the breeds were studied. The frequencies fluctuated over the 51/2 yr. involved, but due to sampling effect in purchase of breeding stock it was not possible to establish if any real trends had occurred.

Footnotes

1 Journal Paper No. J-5779 of the Iowa Agricultural and Home Economics Experiment Station, Ames. Project No. 1424. This work has received assistance from Contract AT (11-1)-707 with the U. S. Atomic Energy Commission.






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Copyright © 1968 by the American Society of Animal Science.