Molecular marker heterozygosities and genetic distances as correlates of production traits in F1 bovine crosses

Genetics and Molecular Biology

Daniella Tambasco-talhari²  Maurício Mello De Alencar¹  Cláudia Cristina Paro De Paz¹  Geraldo Maria Da Cruz¹  Armando De Andrade Rodrigues¹  Irineu Umberto Packer¹  Luiz Lehmann Coutinho¹  Luciana Correia De Almeida Regitano¹ 

[1] ,Universidade Federal de São CarlosSão Carlos SP ,Brazil

关键词: bovine crosses;    molecular markers;    heterozygosity;    genetic distance;    production traits;   

DOI  :  10.1590/S1415-47572005000200007

来源: SciELO

【 摘 要 】

Several studies have investigated the relationship between heterozygosity, genetic distance and production traits. The objective of the present study was to evaluate the influence of the degree of heterozygosity and genetic distance on growth, carcass and reproductive related features in F1 bovine crosses. We tested 10 polymorphic markers in 330 purebred cattle (Nelore, Canchim, Aberdeen Angus and Simental) and 256 crossbred cattle belonging to four crossbred groups. Individual heterozygosities (Hi) and multilocus genetic similarity (Dm) were estimated and used in correlation analysis against individual phenotypic measurements. Significant (p < 0.05) Hi effects occurred for birth weight, 15 to 18 month weight, hot carcass weight and longissimus rib eye area. The extent to which increased heterozygosity (deltaH) in F1 crosses can be predicted from the genetic distance of parental breeds was also investigated using Nei's standard genetic distance (Ds) and standard heterozygosity (Hs). High correlations were found between deltaHi, deltaHs and the Ds of the parental breeds. Our results suggest that heterozygosity of the ten molecular markers used in this study may affect live weight during at least one growth phase. Parental genetic distance was a suitable predictor of the degree of progeny heterozygosity.

【 授权许可】

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