Modeling Growth Curves to Estimate the Suitable Slaughter Ages for Tien Yen Female Chickens Raised by Different Diets

Date Received: Mar 28, 2025

Date Accepted: Aug 25, 2025

Date Published: Sep 30, 2025

DOI: https://doi.org/10.31817/vjas.2025.8.3.

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Issue: Vol. 8 No. 3 (2025): Vietnam Journal of Agricultural Sciences

Section:

ANIMAL SCIENCE – VETERINARY MEDICINE – AQUACULTURE

How to Cite:

Bo, H., Duy, N., Nga, N., Oanh, B., & Ton, V. (2025). Modeling Growth Curves to Estimate the Suitable Slaughter Ages for Tien Yen Female Chickens Raised by Different Diets. Vietnam Journal of Agricultural Sciences, 8(3), 2593–2604. https://doi.org/10.31817/vjas.2025.8.3.

Modeling Growth Curves to Estimate the Suitable Slaughter Ages for Tien Yen Female Chickens Raised by Different Diets

Ha Xuan Bo 1 , Nguyen Van Duy 1 , Nguyen Thi Nga 1 , Bui Thi Kim Oanh 2   , Vu Dinh Ton (*) 1

  • Corresponding author: [email protected]
  • 1 Faculty of Animal Sciences, Vietnam National University of Agriculture, Hanoi 12400, Vietnam
  • 2 Faculty of Economics and Rural Development, Hai Duong College, Hai Duong 03117, Vietnam

    • Keywords

    Bodyweight, chicken, growth performance, mathematical function, slaughter age

    Abstract


    This study aimed to find the best model to describe the growth of Tien Yen female chickens and predict their live weight, weight gain, and suitable slaughter age. The body weights of 180 female chickens were measured every week from birth to 24 weeks of age. The chickens of the control group were fed a diet lower in protein and fiber. The chickens of the treatment group were fed a diet higher in protein and fiber. The data for growth performance were analyzed in R using six mathematical functions (von Bertalanffy, Janoschek, Gompertz, Logistic, Lopez, and Richards). The best models to describe the growth of Tien Yen females were Janoschek for the control group and Richards for the treatment group. The maximum absolute weekly gains occurred at 10 and 11 weeks of age (at the reflection point of the growth curves) and the maximum average weekly gains were obtained at 13.39 and 14.62 weeks of age for the control group and treatment group, respectively. Under the current local market conditions, the estimated economically optimal slaughter ages were 14.33 weeks (1,392.89g) for the control group and 15.17 weeks (1,565.23g) for the treatment group.

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