Abstract
1. Assessment of inbreeding depression for body measurements in Spanish Purebred (Andalusian) horses M.D. Gómez, M. Valera, A. Molina, J.P. Gutiérrez, F. Goyache Livestock Science CrossRef
Highlights
Maternal effects, which result from pre and postnatal influences of dam on progeny, were first described in horses (Walton and Hammond, 1938) the proportion of maternal variance in phenotypic variance has not been extensivelyCONFORMATION TRAITS IN HALF-BRED HORSES studied in this species
The two models are an alternative approach to cytoplasmic effects estimation: Model IIIa includes the additional maternal lineages effect, whereas Model IIIb takes into account the random cytoplasmic effect
Direct heritability of height at withers was equal to 0.57 according to model I, which corresponds to the results of Miserani et al (2002), but is higher than the results of Starun and Socha (2002) for the Małopolski horse h2a =0.305
Summary
Maternal effects, which result from pre and postnatal influences of dam on progeny, were first described in horses (Walton and Hammond, 1938) the proportion of maternal variance in phenotypic variance has not been extensively. CONFORMATION TRAITS IN HALF-BRED HORSES studied in this species. Maternal effects are defined as any influence from a dam on its progeny, excluding the effects of directly transmitted genes. One of the maternally specific sources of genetic variation are genes located in mitochondrial DNA. Since an ovum contains about 100000 copies of mtDNA, whereas a spermatozoa only about 75 copies, both male and female progeny inherit mitochondrial DNA from mother. The influence of mitochondrial genes on some traits in livestock has been studied by many authors (Bell et al, 1985; Mannen et al, 1998)
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