Tendências, parâmetros fenotípicos e genéticos de características de crescimento em bovinos Nelore mocho do Nordeste brasileiro

Amaral, Rosimira dos Santos; Carneiro, Paulo Luız Souza; Filho, Raimundo Martins; Ambrosini, Diego Pagung; Malhado, Carlos Henrıque Mendes

doi:10.1590/s1519-99402014000200003

Cited by 12 publications

(12 citation statements)

References 18 publications

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“…A more significant increase was then observed up to older ages (Figure 1). Similar results were observed by Amaral et al (2014) who evaluated the growth of Nellore cattle in the Northeast of Brazil.…”

Section: Resultssupporting

confidence: 87%

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Weight evaluation of Tabapuã cattle raised in northeastern Brazil using random-regression models

Oliveira

Azevêdo

Malhado

et al. 2017

Arq. Bras. Med. Vet. Zootec.

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The objective of this study is to compare random-regression models used to describe changes in evaluation parameters for growth in Tabapuã bovine raised in the Northeast of Brazilian. The M4532-5 random-regression model was found to be best for estimating the variation and heritability of growth characteristics in the animals evaluated. Estimates of direct additive genetic variance increased with age, while the maternal additive genetic variance demonstrated growth from birth to up to nearly 420 days of age. The genetic correlations between the first four characteristics were positive with moderate to large ranges. The greatest genetic correlation was observed between birth weight and at 240 days of age (0.82). The phenotypic correlation between birth weight and other characteristics was low. The M4532-5 random-regression model with 39 parameters was found to be best for describing the growth curve of the animals evaluated providing improved selection for heavier animals when performed after weaning. The interpretation of genetic parameters to predict the growth curve of cattle may allow the selection of animals to accelerate slaughter procedures.

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Section: Resultssupporting

confidence: 87%

“…These employ multi characteristics to provide animal weight information and do not require standardization or pre adjustments El Faro, 2008;Baldi et al, 2010;Sousa Júnior et al, 2010). To adjust randomregression models, a covariance matrix of infinite size is required and an effective alternative is the use of covariance functions.…”

Section: Introductionmentioning

confidence: 99%

Weight evaluation of Tabapuã cattle raised in northeastern Brazil using random-regression models

Oliveira

Azevêdo

Malhado

et al. 2017

Arq. Bras. Med. Vet. Zootec.

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“…Lacerda et al (2014) estimaram ganhos de 0,06 kg/ano; 0,03 kg/ano e 0,04 kg/ano, para P205, P365 e P550, respectivamente, em bovinos da raça Nelore no estado da Bahia. Enquanto que progresso genético inferior foi relatado na raça Nelore Mocho em todo o Nordeste Brasileiro por Amaral et al (2014), que estimaram tendências genéticas diretas de 0,01; 0,04 e 0,04 kg/ano, para P205, P365 e P550 respectivamente.…”

Section: Resultsunclassified

“…Resultados próximos também foram relatados na raça Nelore, no estado da Bahia, por Lacerda et al (2014), com progressos estimados de 1,13 kg/ano (P205), 1,25 kg/ano (P365) e 1,69 kg/ano (P550). Por outro lado, Amaral et al (2014) estimaram ganhos fenotípicos superiores para P365 (2,10 kg/ano) e P550 (2,84 kg/ano) na raça Nelore Mocho no Nordeste.…”

Section: Resultsunclassified

Parâmetros genéticos para características de crescimento e reprodutivas em bovinos Nelore no Brasil

et al. 2017

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resUMoConhecer o progresso genético e fenotípico de uma população é importante para se avaliar o resultado dos programas de seleção adotados e como elementos norteadores de ações futuras. Assim, objetivou-se estimar parâmetros genéticos, tendências genéticas e fenotípicas dos pesos aos 205 (P205), 365 (P365) e 550 (P550) dias de idade, idade ao primeiro parto (IPP), circunferência escrotal (CE) e intervalos de partos (IDP) de 175.231 bovinos Nelore, nascidos no período de 1967 a 2011 na região Nordeste do Brasil. Os componentes de (co) variância e valores genéticos foram obtidos por meio da metodologia da máxima verossimilhança restrita. As estimativas dos coeficientes de herdabilidades para as características de crescimento foram de baixa a moderada magnitude. A seleção direta proporcionará maiores ganhos genéticos para P550. Para as características reprodutivas, a estimativa de herdabilidade foi baixa para IPP e próxima a zero para IDP. Contudo, para a CE a herdabilidade foi moderada, indicando seu uso como critério de seleção. As tendências genéticas diretas para P205, P365, P550 e IPP, indicam pequenos ganhos genéticos ao longo dos anos. Os progressos fenotípicos evidenciam que as características estão melhorando com o decorrer dos anos, principalmente em decorrên-cia da melhoria ambiental. Genetics parameters for growth and reproductive traits in Nellore Cattle from Brazil sUMMarYTo know the genetic and phenotypic progress of a population is important to evaluate the outcome of the adopted selection programmes and as guiding elements of future actions. The objective was to estimate genetic parameters, genetic and phenotypic trends of weights at 205 (W205) 365 (W365) 550 (W550) days of age, age at first calving (AFC), scrotal circumference (SC) and calving interval (CI) of 175.231 Nellore, born in the period 1967-2011 in the Northeast region of Brazil. The components of (co) variance and breeding values were obtained by restricted maximum likelihood methodology. Estimates of heritability coefficients for growth traits were of a low to moderate magnitude. Direct selection will provide greater genetic gains for W550. For reproductive traits, the heritability estimate was low for ACF and close to zero for CI. However, for the SC heritability was moderate, indicating its use as selection criteria. Direct genetic trends for W205, W365, W550 and ACF indicate small genetic gains over the years. Phenotypic progress shows that the features are improving with the years, mainly because of environmental improvements. additional keYwordsGenetic gain. Genetic trends.

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“…Evaluating Pooled Nellore in the northeast of Brazil, Amaral et al (2014) estimated heritability of 0.19 for weight adjusted to 205 days in single trait analysis. Araújo et al (2014) reported estimates of 0.36 for weight at 210 days in Nellore cattle.…”

Section:    mentioning

confidence: 99%

Preweaning Calf Survival of a Nellore Beef Cattle Population

Júnior¹,

Petrini²,

Mourão³

et al. 2017

JAS

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The preweaning calf survival (SW) is one of the main economic bottlenecks of beef cattle rearing systems, however there is still few quantitative studies approaching this issue. Being a binary trait, genetic parameters for SW can be estimated considering continuous or categorical data under frequentist and Bayesian methods providing support for the selection and mating of animals in breeding programs. Therefore, the objectives in this study were to obtain and compare the variance component estimates for preweaning

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Tendências, parâmetros fenotípicos e genéticos de características de crescimento em bovinos Nelore mocho do Nordeste brasileiro

Cited by 12 publications

References 18 publications

Weight evaluation of Tabapuã cattle raised in northeastern Brazil using random-regression models

Weight evaluation of Tabapuã cattle raised in northeastern Brazil using random-regression models

Parâmetros genéticos para características de crescimento e reprodutivas em bovinos Nelore no Brasil

Preweaning Calf Survival of a Nellore Beef Cattle Population

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