Comparison of non-linear mathematical models and determination of the model that best describes the growth of the Sardi breed

Authors

    M. Balafrej, A. Sahnoun, M. Sadik

DOI:

https://doi.org/10.19182/remvt.31945

Keywords


sheep, growth, selection, mathematical models, Morocco

Abstract

The objective of this study was to identify the most appropriate non-linear mathematical model to describe  the growth curve of the Sardi breed. This study was conducted on a flock of sheep reared in the Krakra breeding station located in El Borouj, Morocco. The flock included 763 males and 649 females corresponding respectively to 3814 and 3240 observations for the following typical ages: birth, 10 days, 30 days, 90 days and adult weight. To model the relationship between weight and age, five models were fitted to the growth data, i.e. Brody, Logistic, Gompertz, von Bertalanffy, and Richards. The growth models were fitted to the data using the maximum likelihood method. The Akaike information criterion (AIC), Bayesian information criterion (BIC) and deviance were used to compare the statistical relevance of the different growth models. Among these models, von Bertalanffy’s function had the lowest values of AIC, BIC and deviance, indicating that this model provided the best representation of data for both sexes of this breed. The parameters of this function can be used to define new selection criteria and improve production predictions through better feed management.

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Affiliations

  • M. Balafrej
    balafrejmed@hotmail.com
    Direction de développement des filières de production, ministère de l’Agriculture, de la Pêche maritime, du Développement rural et des Eaux et Forêts, station D’bagh, avenue Hassan II, Rabat Maroc
  • A. Sahnoun Direction de développement des filières de production, ministère de l’Agriculture, de la Pêche maritime, du Développement rural et des Eaux et Forêts, station D’bagh, avenue Hassan II, Rabat Maroc
  • M. Sadik Ancien directeur de la station d’amélioration génétique ovine Krakra El Borouj, Maroc

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Published

2020-11-25

How to Cite

Balafrej, M., Sahnoun, A., & Sadik, M. (2020). Comparison of non-linear mathematical models and determination of the model that best describes the growth of the Sardi breed. Revue d’élevage Et De médecine vétérinaire Des Pays Tropicaux, 73(4), 255–261. https://doi.org/10.19182/remvt.31945

Issue

Vol. 73 No. 4 (2020)

Section

Animal production and animal products

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© M.Balafrej et al., hosted by CIRAD 2020

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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