Estimates of Direct and Maternal Genetic Correlations for Pupa Weight and Family Size of Tribolium

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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 σ2Ao, 1/16 σ2Ao + 1/8 σAoAm and 1/16 σ2Ao + 1/4 σ>AoAm + 1/4 σ2Am, respectively. Ao and Am represent additive genetic effects for direct and maternal components of a character, respectively. Estimates of the components of σ2Ao, σAoAm and σAm 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. Copyright © 1978. American Society of Animal Science . Copyright 1978 by American Society of Animal Science.

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