Estimativas de parâmetros genéticos e de ganhos direto e indireto à seleção para características reprodutivas e de crescimento em um rebanho da raça Canchim

Castro-Pereira, Viviane Martha de; Alencar, M. M. de; Barbosa, R. T.

doi:10.1590/s1516-35982007000500007

Cited by 16 publications

(9 citation statements)

References 15 publications

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“…The genetic variance for M1 was calculated as the sum of the genetic variance due to the polygenes and the genetic variance due to the marker. The heritability estimates obtained in this study were consistent with those described for the Canchim breed [33][34][35]. Most of the traits presented similar heritabilities for M1 and M2 models, indicating that the M1 was able to separate the genetic variance component of M2 into polygenic and genotypic variance.…”

Section: Genetic Parameterssupporting

confidence: 86%

Effect of IGF1, GH, and PIT1 markers on the genetic parameters of growth and reproduction traits in Canchim cattle

et al. 2014

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The availability of dense genomic information has increased genome-wide association studies for the bovine species; however research to assess the effect of single genes on production traits is still important to elucidate the genes functions. On this study the association of IGF1, GH, and PIT1 markers with growth and reproductive traits (birth weight, weaning weight, weight at 12 and 18 months of age, preweaning average daily weight gain, age and weight at first calving, and scrotal circumference at 12 and 18 months of age) were assessed by means of the variance component approach. The phenotypes were adjusted and then analyzed under two animal models, one which considered the polygenic and genotype (IGF1, GH or PIT1 markers) effects (Model 1), and the other which considers only the polygenic effect (Model 2). When the likelihood ratio test and the Bonferroni correction was applied at 5 % significance level, the genetic markers for the IGF1, GH, and PIT1 genes did not influence significantly the traits (p > 0.002). However, evidence of association of IGF1 with birth weight (p = 0.06) and GH with weight at first calving (p = 0.03) and with weight at 12 months of age (p = 0.08) was observed. In conclusion we could not confirm the associations between IGF1, GH, and PIT1 and growth traits that were previously reported in Canchim cattle, and no association was observed between these genes and reproductive traits. Future studies involving functional markers of IGF1, GH and PIT1 genes may help to clarify the role of these genes in growth and reproductive processes.

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Section: Genetic Parameterssupporting

confidence: 86%

Effect of IGF1, GH, and PIT1 markers on the genetic parameters of growth and reproduction traits in Canchim cattle

et al. 2014

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“…A estimativa média de herdabilidade quanto à idade ao primeiro parto (0,05±0,02, Tabela 2) foi semelhante à obtida por Buzanskas et al (2010), que obtiveram herdabilidade de 0,04, por meio de inferência bayesiana, para a idade ao primeiro parto em fêmeas da raça Canchim. Entretanto, pelo método Máxima Verossimilhança Restrita (REML), outros autores obtiveram estimativas de herdabilidade levemente superiores, que variaram de 0,09 a 0,13, quanto à idade ao primeiro parto em fêmeas da raça Canchim (Silva et al, 2000;Talhari et al, 2003;Castro-Pereira et al, 2007;Baldi et al, 2008). Para a idade ao segundo parto, em animais da raça Canchim, Silva et al (2000) e Baldi et al (2008) obtiveram, pelo método REML, valores de herdabilidade inferiores à do presente trabalho, ou seja, 0,04 e 0,08, respectivamente.…”

Section: Resultsunclassified

Parâmetros genéticos para características de crescimento e reprodução de bovinos da raça Canchim

Borba

Rey

Silva

et al. 2011

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi estimar parâmetros genéticos para idades ao primeiro (IPP) e segundo partos (ISP), idades ao primeiro (IPP PEN ) e segundo partos penalizadas (ISP PEN ), e a ocorrência de parto até os 38 meses de idade (PP 38 ), em bovinos da raça Canchim, bem como estimar as relações genéticas entre essas características e o peso (PE 420 ) de machos e femêas e a circunferência escrotal (CE 420 ) de novilhos, medidos aos 420 dias de idade. Foram estimados parâmetros genéticos em análises bicaracterísticas, por meio de inferência bayesiana. As análises foram realizadas entre CE 420 e PE 420 e as características reprodutivas medidas em fêmeas. As características reprodutivas das fêmeas devem apresentar baixa resposta à seleção, e mudanças no manejo e nas condições ambientais melhoram tais características. A seleção quanto ao maior peso aos 420 dias de idade não deve provocar mudanças nas características reprodutivas em fêmeas, enquanto a seleção para o aumento da circunferência escrotal, na mesma idade, contribui para melhorar tais características.Termo para indexação: bovinos de corte, circunferência escrotal, idade ao parto, ocorrência de parição, peso. Genetic parameters for growth and reproductive traits of Canchim breedAbstract -The objective of this work was to estimate genetic parameters for age at first (AFC) and at second (ASC) calvings, penalized age at first (AFC PEN ) and at second (ASC PEN ) calvings, and occurrence of calving until 38 months of age (PP 38 ) in Canchim breed, as well as to estimate the genetic correlations between these traits with weight (PE 420 ) of males and females, and scrotal circumference (CE 420 ) measured at 420 days of age. Genetic parameters were estimated by two-trait analyses using the Bayesian inference. The analyses were performed between CE 420 and PE 420 , and the reproductive traits measured in the females. The female reproductive traits should show low response to selection, and changes in the management and environmental conditions improve these traits. Selection for the higher weight at 420 days of age does not change female reproductive traits, while selection to increase scrotal circumference, at the same age, contributes to improve such traits.

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“…Moreover, the genetic correlations between scrotal circumference with age at first calving (-0.47 to -0.37), weight at first calving (0.04 to 0.09), and mature body weight (-0.24 to -0.17) (Silva et al, 2000;Castro-Pereira et al, 2007b) are also favorable and indicate that increasing SC by genetic selection will reduce age at first calving, keep weight at first calving unaltered, and reduce mature body weight. Thus, the relative weights of ADG and SC in selection indexes for the ranking of young bulls in performance tests should be higher than the relative weight of FW.…”

Section: Discussionmentioning

confidence: 99%

Associations among growth, scrotal circumference, and visual score of beef cattle in performance tests on pasture or in feedlots

et al. 2017

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-This study aimed to evaluate associations among final weight (FW), average daily gain (ADG), scrotal circumference (SC), and visual score (VS) of beef cattle in performance tests on pasture or in feedlots. Genetic parameters for FW, ADG, SC, and VS of young Nellore bulls performance-tested on pasture or in feedlots were evaluated by mixed model. The performance test and final age were considered as fixed effects and additive genetic and residual effects were considered as random effects. Additive genetic and residual variances for final weight and average daily gain were smaller on pasture than in feedlots. There was no difference between genetic and residual variances and heritability for scrotal circumference on pasture or in feedlots. Genetic variance and heritability for visual score on pasture were smaller than those in feedlots. The posterior means (and highest posterior density intervals with 90% of samples (HPD90)

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Estimativas de parâmetros genéticos e de ganhos direto e indireto à seleção para características reprodutivas e de crescimento em um rebanho da raça Canchim

Cited by 16 publications

References 15 publications

Effect of IGF1, GH, and PIT1 markers on the genetic parameters of growth and reproduction traits in Canchim cattle

Effect of IGF1, GH, and PIT1 markers on the genetic parameters of growth and reproduction traits in Canchim cattle

Parâmetros genéticos para características de crescimento e reprodução de bovinos da raça Canchim

Associations among growth, scrotal circumference, and visual score of beef cattle in performance tests on pasture or in feedlots

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