Planejamento e implementação de um programa de melhoramento genético de ovinos no oeste paulista
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Data
2011-07-29
Autores
Pires, Michele Porto [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Os objetivos desse estudo foram planejar e implementar um programa de melhoramento genético de ovinos no oeste paulista e estimar parâmetros genéticos de características de crescimento e de carcaça em ovinos Suffolk, afim de traçar estratégias de seleção para programas de melhoramento genético. Os dados analisados para a realização do primeiro objetivo, foram coletados da prova de ganho de peso realizada em 2009, sendo os animais oriundos de 11 propriedades próximas a região de Dracena. As características avaliadas foram peso ajustado aos 150 dias de idade (P150) e ganho de peso médio diário (GPD). Para o auxílio da classificação dos cordeiros um índice da prova de ganho de peso (Ipgp) foi elaborado e 5 reprodutores foram indicados para a seleção. Entretanto, por falta de interesse dos produtores, nenhum dos animais indicados para a reprodução foram utilizados, sendo estes, vendidos para o abate. Desta forma, para o início de um programa de melhoramento genético de ovinos na região, será necessário a formação de um rebanho com mérito genético superior, adequado ao sistema de manejo adotado na região e ao mercado consumidor, através de produtores interessados em selecionar seus animais ou então pela faculdade, se responsabilizando pelo fornecimento de material genético para a região. Para a realização do segundo objetivo, os dados avaliados foram coletados entre os anos de 2007 e 2009, oriundos de uma propriedade localizada no Estado de São Paulo, participante do programa de melhoramento Ovigol, desenvolvido pela empresa Aries Reprodução e Melhoramento Genético Ovino – Ltda em parceria com a empresa AbacusBio Limited da Nova Zelândia. As estimativas dos componentes de (co)variâncias e dos parâmetros genéticos foram obtidos pelo software REMLF90, que usou...
The objectives of this study were to design and implement a program of genetic improvement of sheep in western São Paulo state and estimate genetic parameters for growth traits and carcass in Suffolk sheep in order to trace selection strategies for genetic improvement programs. The data analyzed to achieve the first objective, we collected evidence of weight gain took place in 2009, and the animals from 11 properties near the Dracena.These characteristics were adjusted weight at 150 days of age (P150) and average daily weight gain (ADG). To aid the classification of lambs an index of evidence of weight gain (IPGP) was developed and five players were nominated for selection. However, due to lack of interest of producers, none of the animals listed were used for reproduction, the latter being sold for slaughter.Thus, for the beginning of a breeding program for sheep in the region will require the formation of a herd with superior genetic merit, appropriate to the management system adopted in the region and to the consumer market by producers interested in selecting their animals or for college, taking responsibility for providing genetic material for the region. To achieve the second objective, the data evaluated were collected between 2007 and 2009, coming from a property located in the State of São Paulo, participant Ovigol improvement program, developed by Aries Reproduction and Breeding Sheep - Limited in AbacusBio partnership with New Zealand Limited. Estimates of (co) variances and genetic parameters were obtained by REMLF90 software, which used the restricted maximum likelihood method under multi-trait animal model. The predicted heritability for BW, GPPré, PD, GPPós, AOL and EGS were 0.06, 0.48, 0.45, 0.16, 0.10 and 0.07, respectively. Genetic correlations between weight traits ranged from -0.67 to 0.98... (Complete abstract click electronic access below)
The objectives of this study were to design and implement a program of genetic improvement of sheep in western São Paulo state and estimate genetic parameters for growth traits and carcass in Suffolk sheep in order to trace selection strategies for genetic improvement programs. The data analyzed to achieve the first objective, we collected evidence of weight gain took place in 2009, and the animals from 11 properties near the Dracena.These characteristics were adjusted weight at 150 days of age (P150) and average daily weight gain (ADG). To aid the classification of lambs an index of evidence of weight gain (IPGP) was developed and five players were nominated for selection. However, due to lack of interest of producers, none of the animals listed were used for reproduction, the latter being sold for slaughter.Thus, for the beginning of a breeding program for sheep in the region will require the formation of a herd with superior genetic merit, appropriate to the management system adopted in the region and to the consumer market by producers interested in selecting their animals or for college, taking responsibility for providing genetic material for the region. To achieve the second objective, the data evaluated were collected between 2007 and 2009, coming from a property located in the State of São Paulo, participant Ovigol improvement program, developed by Aries Reproduction and Breeding Sheep - Limited in AbacusBio partnership with New Zealand Limited. Estimates of (co) variances and genetic parameters were obtained by REMLF90 software, which used the restricted maximum likelihood method under multi-trait animal model. The predicted heritability for BW, GPPré, PD, GPPós, AOL and EGS were 0.06, 0.48, 0.45, 0.16, 0.10 and 0.07, respectively. Genetic correlations between weight traits ranged from -0.67 to 0.98... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Sheep - Growth, Sheeps - Carcass, Sheeps - Genetic parameters, Ovino - Melhoramento genético, Ovinos - Crescimento, Ovino - Carcaça
Como citar
PIRES, Michele Porto. Planejamento e implementação de um programa de melhoramento genético de ovinos no oeste paulista. 2011. vi, 111 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2011.