Genetic associations between stayability to consecutive calvings and traits of economic interest in taurine and zebu breeds.

Autor: da Silva Morales D; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Universidade Federal de Rondonopolis, Rondonópolis, Brazil., Silva DO; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Universidade Federal de Rondonopolis, Rondonópolis, Brazil., Ayres DR; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Universidade Federal de Rondonopolis, Rondonópolis, Brazil., Junior MLS; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Universidade Federal de Rondonopolis, Rondonópolis, Brazil., Bignardi AB; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Universidade Federal de Rondonopolis, Rondonópolis, Brazil., Ventura RV; Universidade de São Paulo (USP)-Faculdade de Medicina Veterinário e Zootecnia (FMVZ), Pirassununga, Brazil., de Oliveira Menezes GR; Embrapa Gado de Corte, Campo Grande, Brazil., Carvalheiro R; School of Agricultural and Veterinarian Sciences, São Paulo State University (UNESP), Jaboticabal, Brazil., Piccoli ML; GenSys Consultores Associados S/S, Porto Alegre, Brazil., Roso VM; GenSys Consultores Associados S/S, Porto Alegre, Brazil., Pereira RJ; Grupo de Melhoramento Animal de Mato Grosso (GMAT), Universidade Federal de Rondonopolis, Rondonópolis, Brazil.
Jazyk: angličtina
Zdroj: Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie [J Anim Breed Genet] 2024 Jan; Vol. 141 (1), pp. 83-95. Date of Electronic Publication: 2023 Oct 03.
DOI: 10.1111/jbg.12827
Abstrakt: Stayability (STAY) is a way to evaluate the productive longevity of females. Measuring the STAY at each cow calving allows earlier indicators of longevity to be obtained. Our objective with this study was to verify the association between STAY and consecutive calvings and traits potentially used as selection criteria in beef cattle, such as age at first calving (AFC), days to calving (DC), weaning weight (WW), and yearling weight (YW). Data from the Nelore, Angus/Brangus, and Hereford/Braford breeds were used. The estimation of variance components and subsequent prediction of breeding values were performed for all traits. The estimated breeding values (EBV) were used to analyse the association between STAY and the other traits. The Pearson's correlation estimated between the EBV for the intercept coefficient for STAY to consecutive calvings and those of AFC, DC, WW (direct and maternal effects), and YW was favourable and of low magnitude (<0.25) depending on the breed studied. The influence of the genetic merit of AFC on the chance of selection for STAY was favourable and relevant regardless of the intensity of selection and breed. DC and WW (maternal effect) traits were favourably influenced by the chance of selection for STAY, irrespective of breed. The WW (direct effect) did not affect the chance of selection for STAY for the Nelore and Hereford/Braford breeds and negatively influenced, but to a small extent, the Angus/Brangus breed. For YW, an increase in genetic merit affected the chances of selection for STAY, depending on the breed and selection intensity evaluated. The influence of the genetic merit for AFC, DC, and WW (maternal effect) on the chance of selection for STAY to consecutive calvings was favourable and relevant regardless of the selection intensity scenario evaluated. The WW (direct effect) did not influence the chance of selection for STAY. For the scenario with high selection intensity, the selection for YW favourably influenced the chance of selection for STAY in Angus/Brangus and Hereford/Braford breeds but not in Nelore.
(© 2023 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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