Avaliação de procedimentos na estimação de parâmetros genéticos em bovinos de corte

Freitas, A. R. de

doi:10.1590/s1516-35982000000100013

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…Again, the presence of maternal effects tended to remove part of the additive direct variance, as indicated by Notter et al (1992) and Meyer (1992). The higher sire breeding values (mean ± SD) obtained with multiple trait analyses when compared to those obtained by single trait analyses agreed with data reported by Freitas (2000), who observed that the estimation method and the use of single or multiple trait analyses were the main causes of changes in the heritability estimates.…”

Section: Discussionsupporting

confidence: 84%

Maternal effects on the genetic evaluation of Tabapuã beef cattle

et al. 2004

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The aim of this investigation was to study the influence of maternal effects on the genetic evaluation of sire production in Tabapuã beef cattle. Single and multiple trait analyses were done with adjusted animal weights at 120, 240 and 420 days of age. Antagonism was observed between additive direct and maternal genetic effects, with the maternal effect being higher until weaning. The inclusion of maternal effects in the models removed part of the additive variance only in single trait analyses and resulted in smaller means and standard deviations for the sire breeding values. The use of maternal effect associated with single or multiple traits may affect sire ranking. The contradictory results of the single and multiple trait analyses for additive direct and maternal effects indicate that caution is needed when considering recommendations about the importance of maternal effects in Tabapuã beef cattle.

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Section: Discussionsupporting

confidence: 84%

Maternal effects on the genetic evaluation of Tabapuã beef cattle

et al. 2004

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“…Freitas (2000) gave more emphasis on the estimation method used, but also stated that the variance heterogeneity is a problem which, if not treated properly, may result in biased prediction of genetic value. According to this author, the quality of data collected in the field also contributes to decrease the accuracy of genetic evaluations.…”

Section: Variances Heterogeneitymentioning

confidence: 99%

Sire X Herd and Sire X Herd-Year Interactions on Genetic Evaluation of Buffaloes

Moita¹,

Lopes²,

Torres³

et al. 2012

Milk Production - Advanced Genetic Traits, Cellular Mechanism, Animal Management and Health

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Association of an insulin‐like growth factor 1 gene microsatellite with phenotypic variation and estimated breeding values of growth traits in Canchim cattle

et al. 2008

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A population of 1398 Canchim (CA) cattle was genotyped to assess the association of an insulin-like growth factor 1 (IGF1) gene microsatellite with phenotypic variation and estimated breeding values of pre-weaning, weaning and post-weaning growth traits. After an initial analysis, the IGF1 genotype only had a significant effect (P < 0.05) on birth weight (BW) and weaning weight adjusted to 240 days (WW240). For these two traits, direct and maternal breeding values were estimated using the restricted maximum likelihood (reml). Two analyses were carried out. In the first (Model I), all fixed effects were fitted. In the second (Model II), the fixed effect of the IGF1 genotype was omitted. The estimated genetic and phenotypic components of variance were similar for every trait in both models. For Model I, estimated direct and maternal heritabilities were 0.26 and 0.16 for BW and 0.23 and 0.14 for WW240 respectively. The genetic and phenotypic correlations between BW and WW240 were 0.38 and 0.38 (Model I) and 0.19 and 0.38 (Model II) respectively. Fifty animals were classified according to their direct and maternal breeding values for both traits. Spearman rank-order correlation between animal rankings in the two models was used to assess the effect of including the IGF1 genotype in the model. Non-significant values from this correlation were indicative of a difference in breeding value rankings between the two approaches. The IGF1 gene was found to be associated with phenotypic variation and breeding values in the early phase of growth.

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Avaliação de procedimentos na estimação de parâmetros genéticos em bovinos de corte

Cited by 4 publications

References 30 publications

Maternal effects on the genetic evaluation of Tabapuã beef cattle

Maternal effects on the genetic evaluation of Tabapuã beef cattle

Sire X Herd and Sire X Herd-Year Interactions on Genetic Evaluation of Buffaloes

Association of an insulin‐like growth factor 1 gene microsatellite with phenotypic variation and estimated breeding values of growth traits in Canchim cattle

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