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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.
