Genetic and environmental factors on birth and weaning weights of Swiss-Guzera calves

Authors

  • Benedicto do Espírito Santo de Campos Instituto de Zootecnia, Divisão Técnica Básica e Auxiliar, Seção de Estatística e Técnica Experimental, Nova Odessa, SP
  • Alexander George Razook Instituto de Zootecnia, Divisão de Zootecnia de Bovinos de Corte, Seção de Melhoramento de Gado de Corte, Nova Odessa, SP
  • Irineu Humberto Packer Universidade de São Paulo, ESALQ, Departamento de Zootecnia, Piracicaba, SP
  • Celso Barbosa Instituto de Zootecnia, Estação Experimental de Zootecnia de Andradina, SP

Abstract

Genetic and environmental factors were studied for birth weigh (PN) and 210 days weaning weight (PD) from a sample of 461 Swiss-Guzera calves, at Estação Experimental de Zootecnia de Andradina, State of São Paulo, Brazil. They were born through out the year from 1971 to 1976 from 8 Brown-Swiss sires and 187 Guzera dams aged 4 to 14 years old. Statistical analysis showed that for PN year and weight of dam were highly significant factors (P ‰¤ 0.01), while sex and linear component of age dam were significant at (P ‰¤ 0.05). The PD was significantly affected by all factors in the model (P ‰¤ 0.01). Heritability estimates for PN and PD were 0.051 ± 0.067 and 0.203 ± 0.134, respectively. Within each sex the heritability estimates for PN were -0.021 ± 0.090 and -0.022 ± 0.077 for males and females, respectively, while for PD they were 0.308 ± 0.226 and 0.111 ± 0.136. Year of birth was significant (P ‰¤ 0.05) and the linear regression for weight of dam was highly significant (P ‰¤ 0.01). For males the PN was significantly affected (P ‰¤ 0.05) by the linear component of the age of dam. For PD month and year were highly significant factors (P ‰¤ 0.01) in both sexes, therefore sire affected significantly the PD of males at same level of probability, the linear component for age of dam were significant (P ‰¤ 0.05) and linear regression for weight of dam affected both males (P ‰¤ 0.05) and females (P ‰¤ 0.01).

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Published

2014-01-29

Issue

Section

GENETIC

How to Cite

Genetic and environmental factors on birth and weaning weights of Swiss-Guzera calves. (2014). Bulletin of Animal Husbandry, 43(2), 197-207. http://bia.iz.sp.gov.br/index.php/bia/article/view/585

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