Genetic relationship among stayability,scrotal circumference and post-weaning weight in Nelore cattle |
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| Institution: | 1. Department of Animal Science, School of Agricultural and Veterinarian Sciences, Sao Paulo State University (UNESP), Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, SP, Brazil;2. Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, N1G 2W1 Guelph, ON, Canada;3. GenSys Associated Consultants, 90680-000 Porto Alegre, RS, Brazil;4. Department of Exact Sciences, School of Agricultural and Veterinarian Sciences, Sao Paulo State University (UNESP), Via de Acesso Prof. Paulo Donato Castellane, 14884-900 Jaboticabal, SP, Brazil;5. National Council for Science and Technological Development, 71605-001 Brasília, DF, Brazil;6. Department of Animal Science, Universidade Federal de Pelotas, 96160-000 Pelotas, RS, Brazil;1. Department of Veterinary Medicine, Faculdade de Zootecnia e Engenharia de Alimentos – USP, Av. Duque de Caxias Norte, 225, Pirassununga, SP 13635-900, Brazil.;2. Department of Animal Science, Universidade Federal do Paraná, Rua dos Funcionários, 1550, Curitiba, PR 80035-050, Brazil.;1. Departamento de Zootecnia, Universidade Federal do Paraná, Rua dos Funcionários 1540, CEP 80035-050, Curitiba, Paraná, Brazil;2. Instituto de Zootecnia, Centro Avançado de Pesquisa de Bovinos de Corte, CP 63, Sertãozinho, São Paulo, Brazil |
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| Abstract: | Improvement of female fertility has become of fundamental importance for profit maximization in the beef cattle herds. Consequently, animal breeding programs in Brazil have applied selection effort to traits related to reproduction as for scrotal circumference (SC), which is already incorporated to the selection routine of the breeders. However, studies have reported no favorable genetic correlation (rg) of SC with some fertility traits. Recently, stayability (STAY) has been used as means to better indicate and improve female fertility. Values for rg of STAY with reproductive and productive traits are not available in literature. Therefore, the objectives of the present study are to analyze the rg between SC and STAY and STAY with weight at 550 days (W550) in Nelore cattle. Data set of 55,682, 28,507 and 59,750 animals for STAY, SC and W550, respectively, were analyzed using two-trait animal model based on Gibbs sampling algorithm. The estimate of posterior rg between STAY and SC was 0.07 ± 0.03, which can be considered as low and suggesting that STAY does not have sensible relation with SC. The rg of STAY and W550 was 0.15 ± 0.01, considered low, although positive. It means that selection for W550 should not negatively affect STAY. |
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