Influence of maternal-offspring behaviour on the growth of guzerá calves

  • Gabriele Voltareli da Silva Centro APTA Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho, SP
  • Bianca Vilela Pires Faculdade de Medicina de Ribeirão Preto - FMRP/USP, Ribeirão Preto, SP
  • Sergio Pereira Lima Centro APTA Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho, SP
  • Luara Afonso de Freitas Faculdade de Ciências Agrárias e Veterinárias - UNESP, Jaboticabal, SP
  • Lenira El Faro Centro APTA Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho, SP
  • Maria Lucia Pereira Lima Centro APTA Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho, SP
  • Claudia Cristina Paro Paz Centro APTA Bovinos de Corte, Instituto de Zootecnia (IZ), Sertãozinho, SP

Resumo

The present study’s objective was to verify the influence of behavioral characteristics such as strength at birth and human assistance on growth of Guzerá breed calves until weaning, in addition to estimating the growth curve based on age, strength and need for human assistance of Guzerá animals. A total of 73 calves were used, 39 males and 34 females. The calves were classified according to the strength at birth (presence (1) or absence (0) and the need for human assistance (HA = 1 received assistance and HA = 0 received no assistance) 4 hours after calving occurred. The calves were weighed at birth (WB), at 120 ± 20 days (WA120) and during weaning at 210 ± 20 days (WW). The animals were divided into 5 weight classes according to the ages and weights measured. The models of Brody, Von Bertalanffy, Richards, Logístico and Gompertz were tested to estimate animals’ growth until weaning. The birth month of the calves, sex and the need of human assistance influenced (P<0.05) WB and WA120. WW was influenced (P <0.05) by the effects of sex and the need for human assistance. Male calves had kept higher weights than females throughout the study. Among the models tested for growth curve estimation, the Von Bertalanffy model had the best fit for strength at birth and for human assistance. Asymptotic weight and maturity rate were higher in calves that did not require human assistance. The growth curve showed that the absence or presence of strength at birth does not affect weaning weight, while the need for human assistance impairs animal development until weaning.

Publicado
24-11-2017
Como Citar
Silva, G., Pires, B., Lima, S., Freitas, L., El Faro, L., Lima, M., & Paz, C. (2017). Influence of maternal-offspring behaviour on the growth of guzerá calves. Boletim De Indústria Animal, 74. Recuperado de http://iz.agricultura.sp.gov.br/bia/index.php/bia/article/view/1508

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