Estimativas de herdabilidade e tendências genéticas para características de crescimento e reprodutivas em bovinos da raça Nelore: Estimates of heritability and genetic trends for growth and reproduction traits in Nelore cattle

Laureano, Monyka Marianna Massolini; Boligon, Arione Augusti; Costa, Raphael Bermal; Forni, S.; Severo, J. L. P.; Albuquerque, Lúcia Galvão de

doi:10.1590/s0102-09352011000100022

Cited by 57 publications

(54 citation statements)

References 21 publications

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“…There was also a large difference in the365-day weight direct heritability estimate in this study (0.14) and those reported in five other studies (0.24-0.37, reported by GARNERO et al, 2010;AMARAL et al, 2014;ARAÚJO et al, 2014;FERREIRA et al, 2015). Finally, for 550-day weight, a heritability estimate similar to this study (0.21) was reported by Laureano et al (2011) and Amaral et al (2014) (0.18), whereas Garnero et al (2010) and Ferreira et al (2015) reported higher estimates (0.42 and 0.43, respectively). Maternal heritability estimates (Table 2) indicate that maternal effects on calves were largest for birth weight, 120 day weight and 205-dayweight.…”

Section: Resultssupporting

confidence: 90%

“…Marcondes et al (2000), Holanda et al (2004), andAraújo et al (2014) reported maternal heritability estimates for birth weight (0.09-0.11) similar to this study (0.11). Similarly, the maternal heritability estimate for 205-day weight (0.09) was comparable to those reported by Holanda et al (2004), Silveira et al (2004), and Laureano et al (2011) for weaning weight, which was 0.08. According to Passafaro et al (2016), even though maternal effects explain only a small proportion of the phenotypic variation, they should be included in models for analysis of weight data in cattle, because their removal may result in overestimation of heritability estimates and changes in breeding values.…”

Section: Resultssupporting

confidence: 87%

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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: Resultssupporting

confidence: 87%

Genetic parameters of growth traits in Nellore cattle

Kamei

Ribeiro

Fonseca

et al. 2017

SCA

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“…Other studies have also reported high variability in heritability estimates for this trait in Nellore cattle, i.e. 0.14, 0.09, 0.11, 0.26, 0.15 (Boligon et al, 2007;Faria et al, 2007;Boligon et al, 2008;Pereira et al, 2001;Laureano et al, 2011;respectively). Our results indicate that age at first calving presents moderate heritability and is recommended as a selection criterion for sexual precocity.…”

Section: Discussionmentioning

confidence: 93%

Bayesian estimates of genetic parameters for reproductive traits in Nellore cows raised on pasture in tropical regions

Magnabosco

Lopes

Rosa

et al. 2016

Rev Colomb Cienc Pecu

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Estimación bayesiana de parámetros genéticos para características reproductivas en vacasNelore bajo pastoreo en condiciones tropicales Summary Background: Nellore cows are well adapted to tropical conditions, and they have good maternal ability as well as long and prolific reproductive life. Objective: to estimate (co)variances and genetic parameters for calving interval (CI), age at first calving (AFC), gestation length (GL), and days open (DO) in Nellore cows. Methods: covariance components and genetic parameters were estimated using multi-trait Bayesian procedures. Results: three traits had low but statistically significant heritabilities, averaging 0.05, 0.10, and 0.04 for CI, GL, and DO, respectively, whereas age at first calving had a higher heritability (0.36). The permanent environmental effects for CI, GL, and DO were also low, averaging 0.08, 0.07, and 0.15, respectively. The genetic correlations between AFC and CI, AFC and GL, AFC and DO, GL and CI, CI and DO, GL and DO were 0.20, 0.12, 0.11, 0.02, 0.92, respectively. Selection for shorter CI would contribute towards decreasing DO. However, selection for decreased GL could result in a greater number of DO. Despite the

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“…Characteristics related to animal growth are adopted in breeding programs in beef cattle as selection criteria, because of the compensation of producers be made based on carcass weight (LAUREANO et al, 2011). Features such as weights and weight gains as well as economical and easy to be measured in a large number of individuals have genetic variability Mid magnitude in zebu cattle as Nellore and Tabapuã, promoting acceptable genetic gains (ALBUQUERQUE; MERCADANTE; ELER, 2007;SOUSA JÚNIOR et al, 2010a).…”

Section: Genetic Parameters and Growth Modelmentioning

confidence: 99%

Covariance Genetic Estimates For Features Tabapuã Growth In Brazil

et al. 2016

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SUMMARY:This review aimed todiscuss covariance components for Tabapuã the growth characteristics in Brazil, using random regression models. The random regression models (MRA) make it possible to estimate coefficients of the covariance functions by the method of restricted maximum likelihood. These are suitable for longitudinal data analysis models, because of the deficiencies of conventional methods of quantitative genetic analysis, which are considered phenotypic values inherently continuous processes, as discrete processes. The covariance functions show the statistical correlation between two features of a trajectory at different points of same, ie that present in the arrangement have the same direction and magnitude. With the current concern of cutting bovinocultores regarding the growth of animals, the use of methods or techniques that provide increasingly accurate assessments of genetic parameters to be used in studying the development of animals for meat production is relevant.Keywords: Genetic covariance, random regression, Zebu. ESTIMATIVAS DE COVARIÂNCIA GENÉTICA PARA CARACTERÍSTICAS DECRESCIMENTO DA RAÇA TABAPUÃ NO BRASIL RESUMO: Esta revisão teve como objetivo, discorrer os componentes de covariância genética para características de crescimento da raça Tabapuã no Brasil, utilizando modelos de regressão aleatória. Os modelos de regressão aleatória (MRA) possibilitam estimar coeficientes das funções de covariância pelo método da máxima verossimilhança restrita. Estes são adequados para análises de modelos de dados longitudinais, em virtude de suprir as deficiências dos métodos convencionais de análises genéticas quantitativas, os quais se consideram os valores fenotípicos intrinsecamente processos contínuos, como processos discretos. As funções de covariância evidenciam a correlação estatística entre duas características de uma trajetória em pontos diferentes da mesma, ou seja, a disposição que apresentam em possuir a mesma direção e magnitude. Com a atual preocupação dos bovinocultores de corte em relação ao crescimento dos animais, é relevante o uso de métodos ou técnicas que propiciem avaliações cada vez mais acuradas dos parâmetros genéticos que serão utilizados no estudo do desenvolvimento dos animais destinados à produção de carne.Palavras-chave: Covariância genética. Regressão aleatória. Zebu.

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Estimativas de herdabilidade e tendências genéticas para características de crescimento e reprodutivas em bovinos da raça Nelore: Estimates of heritability and genetic trends for growth and reproduction traits in Nelore cattle

Abstract: Estimativas de herdabilidade e tendências genéticas para característicasde crescimento e reprodutivas em bovinos da raça Nelore 0.171 (0.01); 0.219 (0.02); 0.186 (0.03); and 0.224 (0.02) kg per year, for WW, PW, GBW, and GWP, respectively, corresponding to increases of 0.10, 0.08,

Cited by 57 publications

References 21 publications

Genetic parameters of growth traits in Nellore cattle

Genetic parameters of growth traits in Nellore cattle

Bayesian estimates of genetic parameters for reproductive traits in Nellore cows raised on pasture in tropical regions

Covariance Genetic Estimates For Features Tabapuã Growth In Brazil

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