Avaliação de fatores de ambiente e estimativas de parâmetros genéticos para a característica dias para o parto na raça Nelore

Forni, S.; Albuquerque, Lúcia Galvão de

doi:10.1590/s1516-35982006000500011

Cited by 4 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present study, the DC trait was only analysed in females that calved. Forni & Albuquerque (2006) performed analyses considering only females that calved and including all females exposed to bulls, even those with no calving record, with a penalty being attributed to animals that did not calve, that is, 21 days was added to the highest value found for the management group. The authors observed no genetic differences between animals when the data of all exposed females were included, attributing a penalty to those with no calving record.…”

Section: Resultsmentioning

confidence: 99%

Genetic associations of visual scores with subsequent rebreeding and days to first calving in Nellore cattle

Boligon

Ayres

Pereira

et al. 2012

J Animal Breeding Genetics

View full text Add to dashboard Cite

Records of Nellore animals born from 1990 to 2006 were used to estimate genetic correlations of visual scores at yearling (conformation, C; finishing precocity, P; and muscling, M) with primiparous subsequent rebreeding (SR) and days to first calving (DC), because the magnitude of these associations is still unknown. Genetic parameters were estimated by multiple-traits Bayesian analysis, using a nonlinear (threshold) animal models for visual scores and SR and a linear animal models for weaning weight (WW) and DC. WW was included in the analysis to account for the effects of sequential selection. The posterior means of heritabilities estimated for C, P, M, SR and DC were 0.24 ± 0.01, 0.31 ± 0.01, 0.30 ± 0.01, 0.18 ± 0.02 and 0.06 ± 0.02, respectively. The posterior means of genetic correlations estimated between SR and visual scores were low and positive, with values of 0.09 ± 0.02 (C), 0.19 ± 0.03 (P) and 0.18 ± 0.05 (M). On the other hand, negative genetic correlations were found between DC and C (-0.11 ± 0.09), P (-0.19 ± 0.09) and M (-0.16 ± 0.09). The primiparous rebreeding trait has genetic variability in Nellore cattle. The genetic correlations between visual scores, and SR and DC were low and favourable. The genetic changes in C, P and M were 0.02, 0.03 and 0.03/year, respectively. For SR and DC, genetic trends were 0.01/year and -0.01 days/year, respectively, indicating that the increase in genetic merit for reproductive traits was small over time. Direct selection for visual scores together with female reproductive traits is recommended to increase the fertility of beef cows.

show abstract

Section: Resultsmentioning

confidence: 99%

Genetic associations of visual scores with subsequent rebreeding and days to first calving in Nellore cattle

Boligon

Ayres

Pereira

et al. 2012

J Animal Breeding Genetics

View full text Add to dashboard Cite

show abstract

“…Em consonância, a melhoria dos índices de precocidade sexual possibilita a redução do tempo ocioso dos animais e o aumento do número de bezerros produzidos ao longo da vida útil da vaca. Já características como STAY, indicadora da longevidade reprodutiva, possibilitam a ampliação do descarte voluntário e diminuição dos custos com alimentação com fêmeas improdutivas (17), (18),( 14), (16) .…”

Section: Introductionunclassified

Associação de escores visuais com características reprodutivas em bovinos Nelore utilizando Inferência Bayesiana

et al. 2023

View full text Add to dashboard Cite

Resumo A utilização de características morfológicas de bovinos, pelo uso de escores visuais como critério de seleção indireta tem como vantagem a avaliação em animais jovens quanto ao potencial desempenho produtivo e reprodutivo, antecipando a tomada de decisão em comparação a medidas tomadas de forma tardia, como perímetro escrotal aos 450 dias (PE450) e stayability (STAY). Objetivou-se estimar os parâmetros genéticos para características de escores visuais e a associação dessas com características reprodutivas, perímetro escrotal aos 365 (PE365) dias de idade, PE450, STAY, probabilidade de parto precoce (3P) e idade ao primeiro parto (IPP) em bovinos Nelore. Foram utilizadas informações de escores visuais e de reprodução de 4.175 e 3.075 bovinos, respectivamente, com idade média de 22 meses, pertencentes a fazenda HoRa Genética Provada. As características morfológicas foram avaliadas pela metodologia MERCOS. As estimativas de herdabilidade obtidas apresentam grande amplitude, variando de 0,15 a 0,28 para escores visuais e 0,10 a 0,54 para características reprodutivas. As correlações genéticas entre característica de escores visuais e reprodução foram, de maneira geral baixas (0.03-0.66), com exceção entre a musculosidade e 3P, estrutura e STAY, racial e PE450, conformação com PE365, PE450, STAY e IPP, ônfalo com STAY e IPP, e sacro com PE365, STAY e IPP, que foram moderadas a altas. A identificação de animais com melhor osso sacro (mesmo nível das ancas), ou seja, não saliente ou inclinado pode ser uma característica eficiente na identificação para prenhez precoce, e juntamente ao escore de musculatura poderão ser relacionados a animais com menor idade ao primeiro parto.

show abstract

“…Improvement of sexual precocity makes it possible to reduce the animals' pre-productive time and increase the number of calves produced in the cow's lifetime. On the other hand, improvement of STAY, an indicator of reproductive longevity, make it possible to reduce feeding costs with unproductive females (17), (18), (14), (16) .…”

Section: Introductionmentioning

confidence: 99%

Association of visual scores with reproductive traits in Nelore cattle using Bayesian Inference

et al. 2023

View full text Add to dashboard Cite

The use of morphological traits assessed using visual scores as indirect selection criteria in cattle has the advantage of evaluating young animals regarding potential productive and reproductive performance. This enables breeders to make earlier decisions compared to later measurements, such as scrotal circumference at 450 days (SC450) and stayability (STAY). The aim of this study was to estimate the genetic parameters for visual score traits and their associations with reproductive traits: scrotal circumference at 365 days of age (SC365), SC450, STAY, probability of precocious calving (PPC30) and age at first calving (AFC) in Nellore cattle. Visual score data from 4,175 Nellore cattle, with an average age of 22 months, and reproductive data from 3,075 cattle belonging to the HoRa Genetics Provada herd were used. The morphological traits were evaluated by the MERCOS methodology. The heritability estimates obtained ranged from 0.15 to 0.28 for visual scores and 0.10 to 0.54 for reproductive traits. Genetic correlations between visual scores and reproductive traits were generally low, except between: muscularity and PPC30; structure and STAY; racial and SC450; conformation and SC365, SC450, STAY, and AFC; navel and STAY and AFC; and sacrum and SC365, STAY, and AFC, which were moderate to high. The identification of animals with flat sacral bone (not protruding or sloping) can also be an efficient characteristic in the identification for early pregnancy, and together with the musculature score, they can be related to animals with lower age at the first calving.

show abstract

Avaliação de fatores de ambiente e estimativas de parâmetros genéticos para a característica dias para o parto na raça Nelore

Cited by 4 publications

References 18 publications

Genetic associations of visual scores with subsequent rebreeding and days to first calving in Nellore cattle

Genetic associations of visual scores with subsequent rebreeding and days to first calving in Nellore cattle

Associação de escores visuais com características reprodutivas em bovinos Nelore utilizando Inferência Bayesiana

Association of visual scores with reproductive traits in Nelore cattle using Bayesian Inference

Contact Info

Product

Resources

About