Associação genética entre características da carcaça e carne com características de crescimento em bovinos Nelore
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Data
2013-02-26
Autores
Tonussi, Rafael Lara [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Objetivou-se com este trabalho estimar as associações genéticas e fenotípicas entre as características de crescimento e as características da carcaça e carne em animais da raça Nelore. Foram utilizados registros de 241.416, 126.596, 78.687 e 90.720 animais machos e fêmeas, respectivamente para peso à desmama (PD), peso ao sobreano (PS), ganho em peso da desmama ao sobreano (GS), altura da garupa ao sobreano (ALTS) e para as características de carcaça e carne foram utilizados 877 animais machos para peso da carcaça quente e 884 para área de olho de lombo, espessura de gordura subcutânea, índice de marmorização e maciez. Os componentes de (co)variância foram estimados pelo método de máxima verossimilhança restrita. Para a estimação dos componentes de (co)variância foram utilizados modelos animal tricaracterísticas, sempre incluindo o PD. Para PD foram incluídos no modelo os efeitos aleatórios genéticos aditivos, direto e materno, ambiente permanente materno e residual, e os efeitos fixos de grupo de contemporâneos (GC) e idades da vaca ao parto (IVP) e do animal (efeito linear e quadrático), como covariáveis. Para as demais características foram excluídos os efeitos maternos (genéticos e de ambiente permanente) e o efeito idade da vaca ao parto. Os GC para PD foram formados por fazenda, ano de nascimento, grupo de manejo à desmama e sexo. Para PS, GS e ATLS foi acrescentado ao GC o grupo de manejo ao sobreano. Para as características de carcaça e carne os GC foram definidos da mesma forma que para as outras características medidas ao sobreano, excluindo o sexo do animal. Para todas as características foram excluídas observações com medidas de três desvios-padrão acima ou abaixo da média do seu GC. Para as características de crescimento o GC com menos de 10 animais foram excluídos. Para as características de carcaça e carne foram mantidos...
The objective of this study was estimate genetic parameters for growth traits and carcass and meat traits in Nellore. Data from 241.416, 126.596, 78.687, 90.720 males and females, respectively, respectively, for weaning weight (WW), yearling weight (YW), gain from weaning to yearling (GWY), yearling hip height (YHH) and, for carcass and meat traits, only males animals, 877 for hot carcass weight (HCW), and 884 for longissimus muscle area (LMA), backfat thickness (BF), marbling (MAR) and shear force (SF) were used. The (co)variance components were estimated by restricted maximum likelihood. For estimation of (co)variance, three-trait animal models were apllied, always including WW in the analyses. For WW, it included in model the random direct and maternal additive genetic effects, maternal permanent environmental and residual effects, fixed effects of contemporany group and age of animal and age of dam at calving (linear and quadratic effect) as covariates. For the others traits, maternal effects (genetic and permanent environmental) and the effect of age of dam at calving were excluded. The contemporany group for WW were formed by farm, year of birth, weaning management group and sex. For YW, GWY, YHH it was added the management group at yearling. For carcass and meat traits the contemporany groups were defined similarly for the traits measured yearling, excluding the sex of the animal. For all traits observations with measurements of three standard deviations above or below the average of the contemporary groups were excluded. For the growth traits, contemporary groups with less than 10 animals were excluded. For carcass traits and meat CG with more than 3 animals were kept. The heritability estimates for growth traits ranged from 0.12 ± 0.009 to 0.44 ± 0.007. For carcass and meat traits, the heritability estimates were 0.10 ± 0.12 to 0.39 ± 0.15... (Complete abstract click electronic access below)
The objective of this study was estimate genetic parameters for growth traits and carcass and meat traits in Nellore. Data from 241.416, 126.596, 78.687, 90.720 males and females, respectively, respectively, for weaning weight (WW), yearling weight (YW), gain from weaning to yearling (GWY), yearling hip height (YHH) and, for carcass and meat traits, only males animals, 877 for hot carcass weight (HCW), and 884 for longissimus muscle area (LMA), backfat thickness (BF), marbling (MAR) and shear force (SF) were used. The (co)variance components were estimated by restricted maximum likelihood. For estimation of (co)variance, three-trait animal models were apllied, always including WW in the analyses. For WW, it included in model the random direct and maternal additive genetic effects, maternal permanent environmental and residual effects, fixed effects of contemporany group and age of animal and age of dam at calving (linear and quadratic effect) as covariates. For the others traits, maternal effects (genetic and permanent environmental) and the effect of age of dam at calving were excluded. The contemporany group for WW were formed by farm, year of birth, weaning management group and sex. For YW, GWY, YHH it was added the management group at yearling. For carcass and meat traits the contemporany groups were defined similarly for the traits measured yearling, excluding the sex of the animal. For all traits observations with measurements of three standard deviations above or below the average of the contemporary groups were excluded. For the growth traits, contemporary groups with less than 10 animals were excluded. For carcass traits and meat CG with more than 3 animals were kept. The heritability estimates for growth traits ranged from 0.12 ± 0.009 to 0.44 ± 0.007. For carcass and meat traits, the heritability estimates were 0.10 ± 0.12 to 0.39 ± 0.15... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Bovino de corte, Nelore (Zebu), Bovino - Carcaças, Genetica animal, Carne bovina, Carcasses
Como citar
TONUSSI, Rafael Lara. Associação genética entre características da carcaça e carne com características de crescimento em bovinos Nelore. 2013. v, 33 p. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agrárias e Veterinárias, 2013.