Associations between reproductive and carcass traits in Nellore

Authors

  • Edson Junior Heitor de Paula Universidade do Estado de Mato Grosso
  • Elias Nunes Martins Universidade Estadual de Maringá
  • Carlos Antônio Lopes de Oliveira Universidade Estadual de Maringá
  • Cláudio de Ulhoa Magnabosco Embrapa Arroz e Feijão
  • Roberto Daniel Sainz Pesquisador da Embrapa Cerrados
  • Luiz Juliano Valério Geron Universidade do Estado de Mato Grosso
  • Eurico Lucas de Souza Neto Universidade do Estado de Mato Grosso
  • Emília de Paiva Porto Universidade Estadual do Norte do Paraná
  • Giulianna Zilocchi Miguel Universidade do Estado de Mato Grosso

DOI:

https://doi.org/10.5433/1679-0359.2015v36n6Supl2p4423

Keywords:

Bayesian inference, Bos indicus, Genetic parameters, Sexual precocity, Ultrasound.

Abstract

The objective of this study was to estimate the genetic parameters and (co)variance of Nellore animals and to characterize the associations between these characteristics for the following carcass traits: weight (W), longissimus muscle area (LMA), rump fat thickness (RF) and fat thickness between the 12th and 13th ribs obtained by ultrasound (BF); also, the following reproductive traits: age at first calving (AFC), first calving interval (FCI), scrotal circumference at 450 and 550 days of age (SC450 and SC550). The genetic parameters were estimated by a single-trait and two traits animal model using Bayesian inference. The model used for all of the features included the genetic random effect and age as covariate assuming a quadratic effect. Additionally, sex, month and year of birth and management of creation and environmental effects identified were included for the carcass traits. For AFC, FCI and SC450 and SC550, we considered only the month and year of birth. The heritability estimates for all of the traits were higher in the two traits analysis, except for AFC and FCI, which showed 0.75 and 0.29, respectively, similar values in the single trait analysis. The two traits analyses resulted in heritability estimates for a posteriori for the features W, LMA, BF, RF, SC450 and SC550 of 0.49, 0.66, 0.74, 0.68 0.66 and 0.74, respectively, suggesting the possibility of genetic gains during a short period of time. The genetic correlations between AFC and carcass traits measured by ultrasound were close to zero. A similar trend was found for AFC, SC450 and SC550 days, indicating that the selection for these traits does not promote changes in AFC. High genetic correlations (0.92, 0.93 and 0.94) were observed between the characteristics LMA and W, BF and RF, and SC450 and SC550, respectively.

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Author Biographies

Edson Junior Heitor de Paula, Universidade do Estado de Mato Grosso

Prof. Dr., Pesquisador, Universidade do Estado de Mato Grosso, UNEMAT, Pontes e Lacerda, MT, Brasil. 

 

Elias Nunes Martins, Universidade Estadual de Maringá

Prof. Dr., Pesquisador, Universidade Estadual de Maringá, UEM, Maringá, PR, Brasil. 

Carlos Antônio Lopes de Oliveira, Universidade Estadual de Maringá

Prof. Dr., Pesquisador, Universidade Estadual de Maringá, UEM, Maringá, PR, Brasil.

Cláudio de Ulhoa Magnabosco, Embrapa Arroz e Feijão

Prof. Dr., Pesquisador, Embrapa Cerrados/Arroz e Feijão, CPAC/CNPAF, Santo Antônio, GO, Brasil. 

Roberto Daniel Sainz, Pesquisador da Embrapa Cerrados

Prof. Dr., Pesquisador, Universidade da Califórnia, UCDAVIS, Davis, CA, Estados Unidos. 

Luiz Juliano Valério Geron, Universidade do Estado de Mato Grosso

Prof. Dr., Pesquisador, Universidade do Estado de Mato Grosso, UNEMAT, Pontes e Lacerda, MT, Brasil.

Eurico Lucas de Souza Neto, Universidade do Estado de Mato Grosso

Prof. Dr., Pesquisador, Universidade do Estado de Mato Grosso, UNEMAT, Pontes e Lacerda, MT, Brasil.

Emília de Paiva Porto, Universidade Estadual do Norte do Paraná

Profa Dra, Pesquisadora, Universidade Estadual do Norte do Paraná, UENP, Bandeirantes, PR, Brasil. 

Giulianna Zilocchi Miguel, Universidade do Estado de Mato Grosso

Profa Dra, Pesquisadora, Universidade do Estado de Mato Grosso, UNEMAT, Pontes e Lacerda, MT, Brasil. T

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Published

2015-12-16

How to Cite

Paula, E. J. H. de, Martins, E. N., Oliveira, C. A. L. de, Magnabosco, C. de U., Sainz, R. D., Geron, L. J. V., … Miguel, G. Z. (2015). Associations between reproductive and carcass traits in Nellore. Semina: Ciências Agrárias, 36(6Supl2), 4423–4434. https://doi.org/10.5433/1679-0359.2015v36n6Supl2p4423

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