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Expected Phenotypic Response in Weaning Weight of Beef Calves from Selection for Direct and Maternal Genetic Effects

1977; Oxford University Press; Volume: 44; Issue: 3 Linguagem: Inglês

10.2527/jas1977.443360x

1544-7847

L.D. Van Vleck, David St. Louis, J. I. Miller,

Genetic Mapping and Diversity in Plants and Animals

An equation is derived to predict expected phenotypic response to selection when the trait under selection is influenced by both direct and maternal genetic effects. The expected phenotypic response after the i+lth generation of selection is Pi+1 = (i+l)ΔD + iΔM + ΔMC where ΔD and ΔM are the averages of the genetic selection differentials of the parents for the direct and maternal effects and ΔMC is the maternal genetic selection differential for selected females. An example, corresponding to published reports of genetic variances and covariance for direct and maternal effects on weaning weight, illustrates the importance of the covariance term in long term response. With a large negative covariance, selection of males for direct and females for maternal genetic value would give greater expected response in progeny after the first generation than selection of females for direct genetic value.