Utilização de modelos unicaracterística e multicaracterística na estimação de parâmetros genéticos na raça Nelore

Pedrosa, Victor Breno; Eler, Joanir Pereira; Ferraz, José Bento Sterman; Pinto, Luís Fernando Batista

doi:10.1590/1678-6170

Cited by 13 publications

(11 citation statements)

References 14 publications

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“…All calf weight traits measured had considerable direct additive genetic variability (Table 2), and thus can be used in breeding programs for selection for birth weight. The direct birth weight heritability estimate recorded here (0.17) was similar to that reported by Holanda et al (2004) (0.22) and Silveira et al (2004) (0.17), but lower than those reported by Boligon et al (2009), Araújo et al (2014, and Pedrosa et al (2014),which ranged 0.25-0.37. For 120-day weight, the direct heritability estimate (0.14) was below that reported in other Nellore cattle studies (SIQUEIRA et al, 2003;YOKOO et al, 2007;LIRA et al, 2013;FERREIRA et al, 2015).…”

Section: Resultssupporting

confidence: 90%

Genetic parameters of growth traits in Nellore cattle

Kamei

Ribeiro

Fonseca

et al. 2017

SCA

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This study evaluated non-genetic factors and calculated heritability estimates of direct and maternal effects for growth traits in Nellore cattle raised in southern Brazil. Performance records of 4170, 1538, 3139, 1830, and 1151 calves born from 2005 to 2011 were analyzed for birth weight (BW), adjusted120-day weight (W120), adjusted 205-day weight (W205), adjusted365-day weight (W365), and adjusted 550-day weight (W550), respectively. The components of (co)variance used to calculate heritability estimates were determined by Derivative-Free Restricted Maximum Likelihood using the MTDFREML software. Contemporary groups were included in the model as fixed effects, and direct and maternal effects, permanent environmental effects, and residual errors were included as random effects. Phenotypic correlations were estimated using the PROC CORR procedure from SAS. Overall means for BW, W120, W205, W365, and W550 were 38, 138, 201, 270, and 376 kg, respectively. Heritability estimates for direct and maternal effects were 0.17 ± 0.04 and 0.11 ± 0.03 (BW), 0.14 ± 0.03 and 0.03 ± 0.04 (W120), and 0.17 ± 0.04 and 0.09 ± 0.03 (W205). Genetic, phenotypic, and environmental correlations were 0.79, 0.44, and 0.32 for BW and W120, 0.79, 0.39, and 0.26 for BW and W205, and 0.96, 0.74, and 0.75 for W120 and W205. The results indicate that selection for pre-weaning weight would be more efficient using W205, and genetic correlation coefficients indicate that selection at any age should produce a positively correlated response at older ages. Genetic, phenotypic, and environmental correlation coefficients between W365 and W550 were 0.99, 0.75, and 0.76, respectively. Selection for adjusted 550-day weight should produce the greatest genetic gains. Genetic correlation coefficients between weight traits indicate that selection for weight at older ages, which could help reduce the number of weighings and increase accuracy of selection at younger ages, produces gains at older ages. Key words: Beef cattle. Body weight. Correlation. Direct heritability. Maternal heritability. ResumoCom o objetivo de estudar os fatores ambientais e estimar os parâmetros genéticos, para os efeitos diretos e maternos, para as características de crescimento, foram utilizadas 4170, 1538, 3139, 1830 e 1151 observações de peso ao nascer (PN), peso ajustado aos 120 dias de idade (P120), peso ajustado aos 205 dias de idade (P205), peso ajustado aos 365 dias de idade (P365) e peso ajustado aos 550 dias (P550), de bovinos da raça Nelore nascidos no município de Amaporã-PR. As médias estimadas para PN, P120, P205, P365 e P550, foram 38 kg, 138 kg, 201 kg, 270 kg e 376 kg, respectivamente. Os componentes de (co) variância utilizados para estimar as herdabilidades foram obtidos por meio do programa MTDFREML, o modelo utilizado considerou o efeito fixo do grupo de contemporâneos, o efeito da idade da vaca ao parto como covariável, além dos efeitos aleatórios genéticos aditivo direto e materno e o efeito de ambiente permanente. As correlações fenotípicas foram estim...

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Section: Resultssupporting

confidence: 90%

Genetic parameters of growth traits in Nellore cattle

Kamei

Ribeiro

Fonseca

et al. 2017

SCA

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“…The estimates of the genetic correlation between BW and MW was moderately high and positive and higher than the value (0.35) reported by Berry and Crowley (2013). For maternal effects, the estimates of genetic correlations between BW and W90m, and BW and W150m were negative although minuscule, which was in agreement with the results of Pedrosa et al (2014) for birth weight and maternal weaning weight effect (-0.13).…”

Section: Genetic and Phenotypic Correlationssupporting

confidence: 86%

The milk yield of dams and its relation to direct and maternal genetic components of weaning weight in beef cattle

et al. 2017

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“…The means obtained for these traits were similar to those previously reported for Nellore cattle (Boligon et al, 2008(Boligon et al, , 2013Pedrosa et al, 2014a).…”

Section: Resultssupporting

confidence: 88%

Inclusion of cytoplasmic lineage effect and direct-maternal genetic covariance for genetic evaluation of growth traits in Nellore cattle

et al. 2016

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ABSTRACT.We evaluated the impact of cytoplasmic lineage effects (Lc) for growth traits on genetic evaluation, including the genetic covariance between direct and maternal effects (s am ). Pedigree data from 496,190 Nellore animals and observations on birth weight (BW, N = 243,391), weaning weight (WW, N = 431,681), and post-weaning weight gain adjusted to 345 days (PWG, N = 172,131) were analyzed. Four univariate models were used to obtain estimates of (co)variance components using the restricted maximum likelihood method in the BLUPF90 program. Model 1 included Lc and s am . Model 2 included Lc and s am was set to zero. Model 3 did not include Lc. Model 4 did not include Lc and s am was set to zero. These models considered the effects of the Lc as random. Phenotypic variance obtained through cytoplasmic lineage effects was determined for all traits, ranging from 0.07 to 0.15, 0.15 to 0.03, and 0.05 to 0.03% for BW, WW, and PWG, respectively, for models 1 and 2. Correlations between direct and maternal genetic components were positive for WW and negative for BW and PWG. No differences were observed for genetic parameter estimates or animal ranking with the inclusion of s am . For BW, the likelihood ratio suggested that model 1 best fits the data, while model 4 was the most appropriate for WW and PWG. Thus, these models are recommended for genetic evaluations. Despite the low magnitude of cytoplasmic lineages, this effect could predict breeding value and improve the selection of animals for BW in this Nellore population.

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Utilização de modelos unicaracterística e multicaracterística na estimação de parâmetros genéticos na raça Nelore

Cited by 13 publications

References 14 publications

Genetic parameters of growth traits in Nellore cattle

Genetic parameters of growth traits in Nellore cattle

The milk yield of dams and its relation to direct and maternal genetic components of weaning weight in beef cattle

Inclusion of cytoplasmic lineage effect and direct-maternal genetic covariance for genetic evaluation of growth traits in Nellore cattle

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