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Growth Data of Broiler Chickens Fitted to Gompertz Function

  • Duan-yai, S. (School of Veterinary Science and Animal Production, The University of Queensland) ;
  • Young, B.A. (School of Veterinary Science and Animal Production, The University of Queensland) ;
  • Lisle, A. (Faculty of Natural Resource, Agriculture and Veterinary Science. The University of Queensland) ;
  • Coutts, J.A. (Rural Extension Centre, The University of Queensland) ;
  • Gaughan, J.B. (School of Veterinary Science and Animal Production, The University of Queensland)
  • Received : 1998.10.19
  • Accepted : 1999.01.25
  • Published : 1999.12.01

Abstract

This study describes the growth of broiler chickens to the two forms of Gompertz function for application in broiler production models. The first form is based on the estimated mature weight ($W_A$), while the second is based on the estimated hatch weight ($W_O$). Both equations gave identical estimation because they are mathematically identical. To fit the growth curve of commercial broilers that marketed at 35-42 days, it is unnecessary to keep broilers to near maturity (> day 140) to obtain growth data for deriving the Gompertz function. This date does not improve the curve fitting of the early growing period. Additionally, a high mortality and health problem occurred to this type of chicken after day 105.

Keywords

Broilers;Growth Curve;Gompertz Function

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