Productive efficiency in Nelore cows

Authors

  • Victor Eduardo Sala Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Jaboticabal, SP, Brasil
  • Lucia Galvão de Albuquerque Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Jaboticabal, SP, Brasil
  • Maria Eugênia Zerlotti Mercadante Centro de Apoio a Pesquisa Tecnológica dos Agronegócios de Bovinos de Corte (CAPTA - Bovinos de Corte), Instituto de Zootecnia (IZ), Agência Paulista de Tecnologia dos Agronegócios (APTA), Secretaria de Agricultura e Abastecimento
  • Arione Augusti Boligon Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Jaboticabal, SP, Brasil.
  • Sarah Figueiredo Martins Bonilha Centro de Apoio a Pesquisa Tecnológica dos Agronegócios de Bovinos de Corte (CAPTA - Bovinos de Corte), Instituto de Zootecnia (IZ), Agência Paulista de Tecnologia dos Agronegócios (APTA), Secretaria de Agricultura e Abastecimento

Keywords:

peso ao desmame, peso ao nascer, peso da vaca

Abstract

To analyze the effects of the measurements of cow productive efficiency and verify if selection for yearling weight (YW) modified the measures of herd productive efficiency, data of Nelore herd, belonging to the Selection Project of Zebu and Caracu Breeds from the Beef Cattle Center APTA (Animal Science Institute - Sertãozinho - São Paulo - Brazil), were analyzed. The animals are selected for higher YW (NeS and NeT herds being considered as single herd in this paper) and for average YW (NeC) within contemporary group, since 1980. The ratio of birth weight (RPN), calculated by formula: (calf weight birth/cow weight at calving)*100 as the percentage of calf/cow weight at calving, and the ratio of weaning weight (RPD), calculated using the formula: (weaning weight of the calf/cow weight at weaning)*100 as the percentage of calf/ cow weight at weaning. Model included effects of herd (NeC and NeST), cow birth year and age class, calf gender and herd interaction x year of birth. Statistical analyses by minimum square method (GLM procedure of the SAS software) were used. The selection herds (NeST) showed higher (p<0.01) RPN than the NeC herd - 6.87(0.02)% and 6.59(0.04)% of cow weight, respectively. However, the effect of herd was not significant for RPD - 38.25(0.15)% and 37.96(0.25)% of the cow weight for NeST and NeC, respectively. Effects of cow age class and calf gender was significant for RPN and RPD. The selection for yearling weight did not change the productive efficiency of cows. Young cows are more efficient and produce heavier calf (kg%) in relation to its weight.

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Published

2018-01-02

Issue

Section

PRODUÇÃO DE RUMINANTES

How to Cite

Productive efficiency in Nelore cows. (2018). Bulletin of Animal Husbandry, 66(2), 107-113. http://bia.iz.sp.gov.br/index.php/bia/article/view/1670

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