Influência da idade e do peso no início do teste na análise genética de características de crescimento, reprodução e escores visuais de tourinhos Nelore em provas de ganho em peso a pasto

Tineo, Juan Salvador Andrade; Raidan, Fernanda Santos Silva; Santos, D. C.C.; Toral, Fábio Luiz Buranelo

doi:10.21071/az.v65i249.438

Cited by 4 publications

(2 citation statements)

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“…Heritability of FW was higher than that of ADG (Table 3) and changes in FW or ADG were obtained in commercial animals when selection is for FW or ADG in performance-tested young bulls (Tables 4, 5), but selection for increased ADG will result in reduced AFC whereas selection for increased FW will not. FW is more correlated to body weight at the beginning of performance tests than ADG [6, 48], and currently there is no limit for differences in body weight at the beginning of performance tests. Consequently, FW is more affected by body weight at the beginning of the test and herd-of-origin effects than ADG.…”

Section: Discussionmentioning

confidence: 99%

Selection of performance-tested young bulls and indirect responses in commercial beef cattle herds on pasture and in feedlots

et al. 2016

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BackgroundCentral testing is used to select young bulls which are likely to contribute to increased net income of the commercial beef cattle herd. We present genetic parameters for growth and reproductive traits on performance-tested young bulls and commercial animals that are raised on pasture and in feedlots.MethodsRecords on young bulls and heifers in performance tests or commercial herds were used. Genetic parameters for growth and reproductive traits were estimated. Correlated responses for commercial animals when selection was applied on performance-tested young bulls were computed.ResultsThe 90% highest posterior density (HPD90) intervals for heritabilities of final weight (FW), average daily gain (ADG) and scrotal circumference (SC) ranged from 0.41 to 0.49, 0.23 to 0.30 and 0.47 to 0.57, respectively, for performance-tested young bulls on pasture, from 0.45 to 0.60, 0.20 to 0.32 and 0.56 to 0.70, respectively, for performance-tested young bulls in feedlots, from 0.29 to 0.33, 0.14 to 0.18 and 0.35 to 0.45, respectively, for commercial animals on pasture, and from 0.24 to 0.44, 0.13 to 0.24 and 0.35 to 0.57 respectively, for commercial animals in feedlots. The HPD90 intervals for genetic correlations of FW, ADG and SC in performance-tested young bulls on pasture (feedlots) with FW, ADG and SC in commercial animals on pasture (feedlots) ranged from 0.86 to 0.96 (0.83 to 0.94), 0.78 to 0.90 (0.40 to 0.79) and from 0.92 to 0.97 (0.50 to 0.83), respectively. Age at first calving was genetically related to ADG (HPD90 interval = −0.48 to −0.06) and SC (HPD90 interval = −0.41 to −0.05) for performance-tested young bulls on pasture, however it was not related to ADG (HPD90 interval = −0.29 to 0.10) and SC (HPD90 interval = −0.35 to 0.13) for performance-tested young bulls in feedlots.ConclusionsHeritabilities for growth and SC are higher for performance-tested young bulls than for commercial animals. Evaluating and selecting for increased growth and SC on performance-tested young bulls is efficient to improve growth, SC and age at first calving in commercial animals. Evaluating and selecting performance-tested young bulls is more efficient for young bulls on pasture than in feedlots.

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Section: Discussionmentioning

confidence: 99%

Selection of performance-tested young bulls and indirect responses in commercial beef cattle herds on pasture and in feedlots

et al. 2016

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“…É esperado que as diferenças de desempenho entre os animais representem, com confiabilidade, as diferenças genéticas. Estudos para implantação de metodologias de avaliação genética mais adequada para os dados obtidos são importantes para aumentar a acurácia das avaliações e a resposta à seleção(TINEO et al, 2016). De acordo com Farias et al(2017), a bubalinocultura ganhou destaque no cenário nacional, deixando de ser apenas uma alternativa para a ocupação de terras impróprias para a criação de bovinos, e passandoa ser uma opção economicamente rentável.…”

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