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Review
. 2021 Aug 25;11(9):2492.
doi: 10.3390/ani11092492.

The Study of Growth and Performance in Local Chicken Breeds and Varieties: A Review of Methods and Scientific Transference

Antonio González Ariza  1 , Ander Arando Arbulu  1   2 , Francisco Javier Navas González  1   3 , Sergio Nogales Baena  1 , Juan Vicente Delgado Bermejo  1 , María Esperanza Camacho Vallejo  3
Affiliations
Review

The Study of Growth and Performance in Local Chicken Breeds and Varieties: A Review of Methods and Scientific Transference

Antonio González Ariza et al. Animals (Basel). .

Abstract

A review of the scientific advances in the study of the growth and performance in native chicken breeds and varieties over the past 20 years was performed. Understanding the growth patterns of native breeds can only be achieved if the constraints characterizing these populations are considered and treated accordingly. Contextually, the determination of researchers to use the same research methods and study designs applied in international commercial poultry populations conditions the accuracy of the model, variability capturing ability, and the observational or predictive performance when the data of the local population are fitted. Highly skewed sex ratios favouring females, an inappropriate census imbalance compensation and a lack of population structure render models that are regularly deemed effective as invalid to issue solid and sound conclusions. The wider the breed diversity is in a country, the higher the scientific attention paid to these populations. A detailed discussion of the most appropriate models and underlying reasons for their suitability and the reasons preventing the use of others in these populations is provided. Furthermore, the factors conditioning the scientific reception and impact of related publications used to transfer these results to the broad scientific public were evaluated to serve as guidance for the maximization of the success and dissemination of local breed information.

Keywords: growth curves; native breeds and varieties; nonlinear modelling; poultry.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The classification status of European chicken breeds according to FAO DAD-IS halfway through February 2021.
Figure 2
Figure 2
Frequency analysis of the models used to fit for growth and performance in native breeds. The darker the blue in the cheese graphic, the most frequently the model was used. The model in legend appears in decreasing frequency order.
Figure 3
Figure 3
Territorial distribution and number of papers per country.
See this image and copyright information in PMC

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