J. Anim Sci.
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J. Anim Sci. 1978. 47:358-365.
© 1978 American Society of Animal Science
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Estimates of Direct and Maternal Genetic Correlations for Pupa Weight and Family Size of Tribolium1

K. Bondari2, R. L. Willham3 and A. E. Freeman3

Iowa State University, Ames 50011

Abstract

Three designs were planned and carried out simultaneously on Tribolium castaneum to investigate genetic maternal influences on pupa weight and family size. Design 1 included 331 sires each mated to two random dams from which one male and one female of each family were measured. Designs 2 and 3 yielded first generation and second generation offspring from 208 and 123 grandsires, respectively. These grandsires were the sires used in Design 1. Each grandsire was randomly mated to two granddams. The first generation offspring were two paternal half-sibs of different sexes in Design 2 and of the same sex (females) in Design 3. Of the progeny from mating each first generation individual to a random mate, one male and one female were measured. Components of variance for sires in Design 1 and for grandsires in Designs 2 and 3 had expectations of 1/4 {sigma}2Ao, 1/16 {sigma}2Ao + 1/8 {sigma}AoAm and 1/16 {sigma}2Ao + 1/4 {sigma}>AoAm + 1/4 {sigma}2Am, respectively. Ao and Am represent additive genetic effects for direct and maternal components of a character, respectively. Estimates of the components of {sigma}2Ao, {sigma}AoAm and {sigma}Am expressed as a percentage of their corresponding total variance were 36.8, –8.7 and 28.7 for pupa weight and 39.5, – 20.3 and 59.0 for family size, respectively. Genetic correlations between direct and maternal effects were estimated to be –.27 and –.44 for pupa weight and family size, respectively.

Footnotes

1 Journal Paper No. J 8984 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 2000.

2 Department of Animal Science, College of Agriculture, University of Tehran, Karaj, Iran.

3 Department of Animal Science, Iowa State University, Ames.






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Copyright © 1978 by the American Society of Animal Science.