Estimation of direct and maternal breed effects for prediction of expected progeny differences for birth and weaning weights in three multibreed populations

Journal of Animal Science
F A Rodríguez-AlmeidaK E Gregory

Abstract

Direct and maternal breed effects on birth and 200-d weights were estimated for nine parental breeds (Hereford [H], Angus [A], Braunvieh [B], Limousin [L], Charolais [C], Simmental [S], Gelbvieh [G], Red Poll [R], and Pinzgauer [P]) that contributed to three composite populations (MARC I = 1/4B, 1/4C, 1/4L, 1/8H, 1/8A; MARC II = 1/4G, 1/4S, 1/4H, 1/4A; and MARC III = 1/4R, 1/4P, 1/4H, 1/4A). Records from each population, the composite plus pure breeds and crosses used to create each composite, were analyzed separately. The animal model included fixed effects of contemporary group (birth year-sex-dam age), proportions of individual and maternal heterosis and breed inheritance as covariates, and random effects of additive direct genetic (a) and additive maternal genetic (m) with covariance (a,m), permanent environment, and residual. Sampling correlations among estimates of genetic fixed effects were large, especially between direct and maternal heterosis and between direct and maternal breed genetic effects for the same breed, which were close to -1. This resulted in some large estimates with opposite sign and large standard errors for direct and maternal breed genetic effects. Data from a diallel experiment with H, A, B, and R b...Continue Reading

Citations

Oct 1, 2009·Genetics and Molecular Biology·Ana Maria Bezerra Oliveira LôboOlivardo Facó
Nov 26, 2008·Journal of Animal Science·B L GoldenL L Benyshek
Jan 27, 2018·Journal of Animal Science·Everestus C AkannoGraham S Plastow
Feb 1, 2007·Animal : an International Journal of Animal Bioscience·R A AfolayanW A McKiernan
Sep 18, 2007·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·A LegarraI Misztal

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