EVALUATION OF FOUR CLASSICAL NON-LINEAR MODELS TO DESCRIBE THE GROWTH CURVE OF FUNAAB-ALPHA CHICKENS

Authors

  • H. A. Bashiru Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria
  • S. O. Oseni Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria
  • L. A. Omadime Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria

DOI:

https://doi.org/10.51791/njap.vi.6546

Keywords:

Non-linear models, Growth curve parameters, FUNAAB-Alpha chickens, Point of Inflection

Abstract

The objective of this study was to evaluate four non-linear models (Gompertz, Logistic, Bertalanffy and Richard’s) to describe the growth performance of FUNAAB-Alpha chickens (FAC). Three hundred (300) FAC chicks of both sexes were raised from day old till the 20th weeks of age. Body weight records were taken weekly and the NLIN procedure of SAS® was used to fit four non-linear growth functions. For all the models, parameter A (or asymptotic weight) ranged from 2050.8 to 3716.6g for the male and 1591.7 to 3330g for the female chicken respectively, while parameter B (constant of integration) ranged from 0.7541 to 15.441. Similarly, parameter K (maturity index) ranged from 0.0463 to 0.2002.The parameter A (asymptotic weight) was highest for Bertalanffy model while the Logistic model estimated the highest value of parameter B (the scaling parameter) and parameter K (maturity index). For all the models fitted, age at inflection point ranged between 13.30 and 17.63 weeks for male chickens and 14.23 and 19.94 weeks for female chickens, while the corresponding body weight at inflection point ranged between 754 and 1528 g and 586 and 1261 g for male and female chickens respectively. Using the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) as the goodness-of-fit criteria, the Bertalanffy and Gompertz growth models were adjudged as the best fit models for evaluating the growth of FAC.

Author Biographies

H. A. Bashiru, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria

Department of Animal Sciences

S. O. Oseni, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria

Department of Animal Sciences

L. A. Omadime, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria

Department of Animal Sciences

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Published

2024-07-20

How to Cite

Bashiru, H. A., Oseni, S. O., & Omadime, L. A. (2024). EVALUATION OF FOUR CLASSICAL NON-LINEAR MODELS TO DESCRIBE THE GROWTH CURVE OF FUNAAB-ALPHA CHICKENS. Nigerian Journal of Animal Production, 117–122. https://doi.org/10.51791/njap.vi.6546

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