Characterisation of biological growth curves of different varieties of an endangered native hen breed kept under free range conditions

González, Antonio; Nogales, Sergio; Lupi, Teresa Marta; Arando, Ander; Navas González, Francisco Javier; León, José Manuel; Delgado Bermejo, Juan Vicente; Camacho Vallejo, María Esperanza

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Authors

Navas González, Francisco Javier

León, José Manuel

Delgado Bermejo, Juan Vicente

Camacho Vallejo, María Esperanza

Abstract(s)

The aim of this study is to model the growth samples of four varieties (White, Black, Partridge, Franciscan) of Spanish Utrerana hen breed, which is endangered, by using Brody, Von Bertalanffy, Verhulst, Logistic and Gompertz models. For this purpose, a total of 16,235 weight data observations from 2004 animals reared in free range system were collected. Logistic was the best suited model for predicting the biological growth curve of White variety in both sexes, while Von Bertalanffy was the best fitting model for the rest of individuals of the breed, based on the 5 goodness-of-fit and flexibility criteria: Pseudo-R2 , mean squared error, Akaike information criterion, Bayesian information criterion and the biological coherence of the estimated parameters. Black variety was the heaviest, with values of 2605.96 and 2032.61 g (for males and females, respectively) for a parameter, while White variety presented the lowest maturity weight (a ¼ 2442.99 and 1874.24 g, for males and females, respectively). Conclusively, this growth characterisation is essential for the conservation of the Utrerana hen, to search for new market niches and a greater profitability to this differentiated product.

Keywords

Growth curves Curvas de crescimento Non-linear models Growth parameters Local breeds Variety

URI

http://hdl.handle.net/10400.11/7553

Citation

Gonzalez, A., Nogales, S., Lupi, TM., Arando, A., Navas, FJ., León, JM., Delgado, JV., Camacho, ME. 2021. Italian Journal of Animal Science, 20, 1, 806-813.https://doi.org/10.1080/1828051X.2021.1915190Characterisation of biological growth curves of different varieties of an endangered native hen breed kept under free range conditions. .