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Estimação de parâmetros genéticos para escores visuais e características de desenvolvimento ponderal na raça Nelore

Authors: Duitama, L. O.; Fonseca, R. da; Bertipaglia, T.; Machado, C. H.; Soares Filho, C. V.;

Estimação de parâmetros genéticos para escores visuais e características de desenvolvimento ponderal na raça Nelore

Abstract

O objetivo foi avaliar a associação genética entre os escores visuais de estrutura, precocidade e musculosidade, com as características peso aos 18 meses, ganho de peso diário e o perímetro escrotal em machos Nelore. Foram utilizados 7.256 registros de animais participantes de provas de ganho de peso. As estimativas dos componentes de (co)variâncias foram obtidas por meio de Máxima Verossimilhança Restrita, empregando-se um modelo animal. Os efeitos fixos de grupo contemporâneo, idade e peso como covariável linear foram considerados; o único efeito aleatório foi o genético aditivo direto. As estimativas de herdabilidade de estrutura, precocidade e musculosidade foram: 0,30; 0,37; 0,32, respectivamente. As estimativas das correlações genéticas entre os escores variaram de 0,76 a 0,95, indicando que os escores são controlados, em grande parte, pelo mesmo grupo de genes. As estimativas das correlações genéticas dos escores visuais com as características de ganho de peso diário, peso aos 18 meses e o perímetro escrotal apresentaram valores semelhantes entre os escores 0,45 a 0,50; 0,80 a 0,83 e -0,05 a -0,03, respectivamente; indicando que a seleção para os escores trará mudanças genéticas no mesmo sentido para o peso aos 18 meses e em menor medida para o ganho de peso.

Country
Brazil
Keywords

musculosidade, weight gain trial, precocidade, SF1-1100, 630, body structure, prova ganho de peso, Animal culture, estrutura corporal, muscling, finishing precocity

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    7
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
Top 10%
Average
Average
Green
gold