Two-trait random regression model to estimate the genetic association of scrotal circumference with female reproductive performance in Nelore cattle |
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| Affiliation: | 1. Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Campus Universitário de Rondonópolis, Universidade Federal de Mato Grosso, Rondonópolis, Mato Grosso, Brazil;2. Grupo de Melhoramento Animal e Biotecnologia (GMAB), Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Medicina Veterinária, Universidade de São Paulo, Pirassununga, São Paulo, Brazil;1. Atomic and Molecular Group, Faculty of Physics, Yazd University, Yazd, Iran;2. The Laboratory of Quantum Information Processing, Yazd University, Yazd, Iran;1. Department of Transplant Surgery, Henry Ford Hospital, Detroit, Michigan;2. Department of Pathology, Henry Ford Hospital, Detroit, Michigan;3. Department of Gastroenterology and Hepatology, Henry Ford Hospital, Detroit, Michigan;1. Grup de Física Teòrica and IFAE, Departament de Física, Universitat Autònoma de Barcelona, Bellaterra E-08193 Barcelona, Spain;2. Departamento de Física Atómica, Molecular y Nuclear and Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, E-18071 Granada, Spain;1. Prenatal Diagnosis Center, Hangzhou Maternity and Child Care Hospital, Hangzhou, Zhejiang, China;2. Department of Pathology, Hangzhou First People''s Hospital, Hangzhou, Zhejiang, China;2. Animal Genomics and Improvement Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705-2350 |
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| Abstract: | In an attempt to determine when scrotal circumference (SC) could be a reasonable indicator of female reproductive performance, a series of two-trait random regression model (regression for SC on age at measurement) using Gibbs sampling was applied to field data of Nelore cattle raised in a tropical environment. The female traits evaluated were age at first calving (AFC), first calving interval (FCI), heifer pregnancy (HP), and stayability (STAY). The posterior means of heritability of female traits ranged from 0.15 for AFC to 0.46 for HP and were about 0.50 for SC. The posterior means of genetic correlations between SC and AFC, FCI, HP, STAY were up to −0.70, −0.25, 0.48, and 0.29, respectively. Genetically, SC could be a reasonable indicator of female puberty (e.g., HP) as long as it is measured at a young age (400–440 days). However, for female reproductive traits measured at an older age (e.g., STAY), SC is merely a modest or even poor indicator. The use of sire expected progeny differences for female reproductive traits will be more effective than the use of expected progeny differences for SC to improve the reproductive performance of female cattle. |
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| Keywords: | Genetic correlation Pregnancy Puberty Threshold model Zebu |
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