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• W2388062297 abstract "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, and -0.21, 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 favorable genetic correlations, the direct selection responses for these traits would be low. Conclusion: reproductive traits are strongly influenced by environmental effects. Changes in management and environmental factors could rapidly improve reproductive performance of Polled Nellore herds. Genetic selection for these traits should produce a much slower but permanent response. Keywords: animal breeding, beef cattle, fertility, reproductive efficiency, zebu. Resumen Antecedentes: las vacas Nelore se adaptan bien a las condiciones tropicales, y tienen buena habilidad materna, asi como larga y prolifica vida reproductiva. Objetivo: evaluar la estimacion de las (co)varianzas y los parametros geneticos para el intervalo entre partos (CI), la edad al primer parto (AFC), duracion de la gestacion (GL) y el periodo de servicio (DO) en vacas Nelore. Metodos: los componentes de covarianza y los parametros geneticos fueron estimados por procedimientos multivariados Bayesianos. Resultados: tres caracteristicas, CI, GL y DO presentaron bajos promedios de heredabilidad, promediando 0,05, 0,10 y 0,04, respectivamente, mientras que la edad al primer parto presento una heredabilidad mas alta (0,36). Los efectos ambientales permanentes del CI, GL y DO tambien resultaron con estimaciones bajas, con promedios de 0,08, 0,07 y 0,15, respectivamente. Las estimaciones de las correlaciones geneticas entre AFC y CI, AFC y GL, AFC y DO, GL y CI, CI y DO, GL y DO fueron 0,20, 0,12, 0,11, 0,02, 0,92 y 0,21, respectivamente. La seleccion para un CI reducido puede contribuir a una reduccion de los DO. Sin embargo, la reduccion de la GL puede dar lugar a un mayor DO. A pesar de las favorables estimaciones de la correlacion genetica, la respuesta a la seleccion directa de estos rasgos seria baja. Conclusion: las caracteristicas reproductivas se ven fuertemente afectadas por efectos ambientales. Asi, los cambios en la gestion y las condiciones ambientales dan lugar a una mejora rapida de estas caracteristicas, mientras que la seleccion genetica produce cambios mas lentos pero permanentes. Palabras clave: cebu, eficiencia reproductiva, fertilidad, ganado de carne, mejoramiento animal. Resumo Antecedentes: vacas da raca Nelore sao bem adaptadas as condicoes tropicais e apresentam boa habilidade materna, bem como elevada longevidade e prolificidade. Objetivos: avaliar a estimativa de (co)variâncias e parâmetros geneticos para o intervalo de partos (IEP), idade ao primeiro parto (IPP)," @default.
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• W2388062297 date "2016-05-11" @default.
• W2388062297 modified "2023-10-16" @default.
• W2388062297 title "Bayesian estimates of genetic parameters for reproductive traits in Nellore cows raised on pasture in tropical regions" @default.
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• W2388062297 doi "https://doi.org/10.17533/udea.rccp.v29n2a05" @default.
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