Herdabilidades e correlações entre pesos do nascimento à idade adulta em rebanhos da raça Nelore

Boligon, Arione Augusti; Albuquerque, Lúcia Galvão de; Mercadante, Maria Eugênia Zerlotti; Lôbo, Raysildo Barbosa

doi:10.1590/s1516-35982009001200005

Cited by 62 publications

(76 citation statements)

References 19 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%

“…Moreover, selection for weight at any age should produce changes in the same direction at older ages. Boligon et al (2009) andPassafaro et al (2016) also found medium to high genetic correlations for weights at different ages and, in general, correlation coefficients were higher between adjacent weights. Estimating genetic correlations for weight at both young and adult ages is important because response to selection in adult weight, which has long been practiced in beef cattle, would be higher for higher weights at younger ages.…”

Section: Resultsmentioning

confidence: 97%

“…Several studies have reported low to moderate genetic additive heritability for pre-weaning weights LIRA et al, 2013;ARAÚJO et al, 2014;FERREIRA et al, 2015), high heritability for post-weaning weights LIRA et al, 2013;FERREIRA et al, 2015), and high positive genetic correlations between weights at different ages, with higher genetic correlations between adjacent weights, decreasing as the age difference increases (BOLIGON et al, 2009;GARNERO et al, 2010;PASSAFARO et al, 2016).These results indicate that direct selection can result in genetic gains. The characteristics of weight development in beef cattle are very important, as they reflect the growth curve of the animals, which is key to productivity increase in meat-producing systems.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Genetic parameters of growth traits in Nellore cattle

Kamei

Ribeiro

Fonseca

et al. 2017

SCA

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“…In general, our results suggest that genetic selection based on weight, mainly from the weaning to after yearling period, should result in reduction of the age at first calving. However, at long-term, this selection may be increasing mature weight of the cow as shown by Silva et al (2000) and Boligon et al (2009). Thus, the inclusion of age at first calving in the selection index becomes an interesting alternative, since this trait has few genetic associations with mature weight.…”

Section: Resultsmentioning

confidence: 99%

“…However, the selection only for higher weight at young ages can increase the mature weight due to genetic correlations from medium to high magnitudes between weights in different ages (Silva et al 2000;Boligon et al 2009). Similarly, the average weight gain obtained in different growth stages are also, either to a low or high level, genetically correlated to mature body weight.…”

Section: Introductionmentioning

confidence: 99%

Study of relations among age at first calving, average weight gains and weights from weaning to maturity in Nellore cattle

Boligon

Albuquerque²,

Mercadante

et al. 2010

R. Bras. Zootec.

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-Data from 23,120 Nellore animals were used to estimate genetic parameters for age at first calving, average gains from weaning to yearling and from yearling to after yearling, weaning weight, yearling weight, after yearling weight and weight at 2 and 5 years of age. Animal models were fitted by Restricted Maximum likelihood Method. Estimate heritability for age at first calving, weaning to yearling weight gain, yearling to after yearling weight gain, weight at weaning, yearling weight, after yearling weight and weight from 2 to 5 years of age were 0.17 ± 0.01; 0.23 ± 0.03; 0.25 ± 0.03; 0.28 ± 0.02; 0.26 ± 0.03; 0.30 ± 0.03; 0.32 ± 0.02 and 0.36 ± 0.04, respectively. The genetic correlation estimates between age at first calving and weight traits ranged from -0.26 to -0.14. The genetic correlation estimates between age at first calving and average gains were also negative, but higher (-0.29 and -0.32). In general, these results indicate that selection for average gains will promote changes in age at first calving and female mature weight. Improvement in reproductive performance could be obtained with the inclusion of the age at first calving in the selection index.Key Words: beef cattle, genetic parameters, heritability, productive and reproductive traits Estudo das relações entre a idade ao primeiro parto, ganhos em peso e pesos da desmama à maturidade em bovinos da raça Nelore RESUMO -Dados de 23.120 animais da raça Nelore foram utilizados para estimar herdabilidade e correlações genéticas para a idade ao primeiro parto, o ganho em peso da desmama ao ano e do ano ao sobreano, o peso à desmama, o peso ao ano, o peso ao sobreano e os pesos aos 2 e aos 5 anos de idade. Utilizou-se o método da máxima verossimilhança restrita, em análise multicaracterística. As herdabilidades estimadas para idade ao primeiro parto, ganho da desmama ao ano, ganho do ano ao sobreano, peso à desmama, peso ao ano, peso ao sobreano e peso aos 2 aos 5 anos foram de 0,17 ± 0,01; 0,23 ± 0,03; 0,25 ± 0,03; 0,28 ± 0,02; 0,26 ± 0,03; 0,30 ± 0,03; 0,32 ± 0,02 e 0,36 ± 0,04, respectivamente. Correlações genéticas baixas e negativas foram estimadas entre a idade ao primeiro parto e os pesos medidos em diferentes idades, que variaram de -0,26 a -0,14. As correlações genéticas estimadas entre a idade ao primeiro parto e os ganhos de peso também foram negativas, porém levemente superiores (-0,29 e -0,32). Os resultados indicam que a seleção para maior ganho de peso pode reduzir a idade ao primeiro parto e aumentar o peso adulto de fêmeas da raça Nelore. Mudança genética mais rápida para diminuição da idade ao primeiro parto das fêmeas pode ser obtida com a inclusão dessa característica nos índices de seleção.Palavras-chave: bovinos de corte, características produtivas e reprodutivas, herdabilidade, parâmetros genéticos Revista Brasileira de Zootecnia

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