Estimation of (co)variances for growth traits in Nellore cattle raised in the Humid Tropics of Brazil by random regression
作者: Jorge Luís Ferreira Fernando Brito Lopes Leonardo Sousa Pereira Leandro Lopes Nepomuceno José Américo Soares Garcia Raysildo Barbosa Lôbo Roberto Daniel Sainz
作者单位: 1Universidade Federal do Tocantins
2University of Wisconsin, Madison
3Faculdade de Agronomia e Veterinária Universidade de Brasilia
4Nacional de Criadores e Pesquisadores
5University of California
刊名: Semina: Ciências Agrárias, 2015, Vol.36 (3), pp.1713-1724
来源数据库: Directory of Open Access Journals
DOI: 10.5433/1679-0359.2015v36n3p1713
关键词: HeritabilityPerformanceThe growth curve
原始语种摘要: Random regression models are currently used in genetic evaluation of beef cattle, because they allow changes in the mean and variance of the trait over time as well as estimation of (co) variances between any points along the growth curve. This study aimed to estimate (co)variances and genetic parameters for growth traits of Nelore cattle by random regression using models with heterogeneous and homogeneous residual variance. We utilized 23,278 weight records from birth to 550 days of age, from animals born between 1993 and 2010. The best-fitting model considered direct genetic, maternal genetic, permanent environmental animal and maternal permanent environmental effects, adjusted by fourth, third, sixth and fourth order polynomials, respectively. Heritability estimates for direct genetic...
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关键词翻译
关键词翻译
  • random 随机的
  • cattle 
  • genetic 遗传的
  • growth 生长
  • estimate 估计
  • maternal 母的
  • third 第三的
  • heritability 遗传力
  • permanent 永久的
  • fourth 第四