The new performance test at Sertãozinho, State of São Paulo, Brazil. III. Limitations in the selection for growth between herds of canchim breed

Authors

  • Alexander George Razook Instituto de Zootecnia, Estação Experimental de Zootecnia de Sertãozinho, SP
  • José Benedito de Freitas Trovo Instituto de Zootecnia, Estação Experimental de Zootecnia de Sertãozinho, SP
  • Laércio José Pacola Instituto de Zootecnia, Estação Experimental de Zootecnia de Sertãozinho, SP
  • José do Nascimento Instituto de Zootecnia, Divisão de Zootecnia de Bovinos de Corte, Seção de Melhoramento de Gado de Corte, Nova Odessa, SP
  • Antonio Álvaro Duarte de Oliveira Instituto de Zootecnia, Divisão Técnica Básica e Auxiliar, Seção de Estatística e Técnica Experimental, Nova Odessa, SP
  • Irineu Humberto Packer Universidade de São Paulo, ESALQ, Piracicaba, SP
  • Mauro Procknor Instituto de Zootecnia, Estação Experimental de Zootecnia de Sertãozinho, SP
  • Roberto Hauck Reichert Instituto de Zootecnia, Estação Experimental de Zootecnia de Sertãozinho, SP

Abstract

The purpose of this study was to evaluate the effects of year of test, month of birth and breeder on growth characteristics of 205 canchim bulls at the new performance test of Sertãozinho, State of São Paulo, Brazil. The animals, reared by 18 different breeders, had the following characteristics collected: initial weight corrected for age (P210), gain on pasture in 14 days (GE14), gain during the adaptation period (GA56), gain in 112 days of test (G1 12), total gain in feedlot (G 168), corrected final weight (P392) and actual final weight (PPF). The year was an important source of variation for all the characteristics but P210. The effect of month of birth was highly significant (P <0.01) for PV and PPF, significant (P <0.05) for P210 and GA56 and not significant for GE14, G112 and G168. The highest averages were for the August born animals except for P210 and P392. For these characteristics the highest averages were for the October born individuals. Breeders effect was highly significant for all the characteristics except for GE14. The initial weight (PV) considered as a continous independent variable was highly significant source of variation (P <0.01) for all the characteristics and significant (P <0.05) for G1 12. The initial weight was not entirely responsible for the breeder effect. Breeder effect was not eliminated through the test and was probably a source or errors in the estimation of the breeding values of bull for final weight.

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Published

2014-01-29

Issue

Section

ANIMAL NUTRITION

How to Cite

The new performance test at Sertãozinho, State of São Paulo, Brazil. III. Limitations in the selection for growth between herds of canchim breed. (2014). Bulletin of Animal Husbandry, 41(1), 35-45. http://bia.iz.sp.gov.br/index.php/bia/article/view/651

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