Descriptores sencillos para la diferenciación de huevos en fenotipos aviares
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A sample of 322 eggs were studied from the following breeds and varieties: 'Empordanesa' (White n=23, White-blonde n=39, Red n=40 and Blond n=27), 'Flor d'Ametller' (n=40), 'Gallina Pairal' (n=43) and 'Penedesenca' (Partridge n=40, Crele n=13, Black n=30 and Wheaten n=27). From individual digital pictures
of the eggs, maximum length and width were obtained, and from them three indexes were deduced: area, shape and volume ratios. Weight was obtained by direct weighing. Multivariate analysis revealed statistically significant differences among most of the breeds and varieties. Non-differentiated phenotypes included various groups varieties: 'Penedesenca' (except Crele with Black), 'Wheaten Penedesenca' with 'White-blonde Empordanesa', 'Black Penedesenca' with 'Blond Empordanesa', and 'White-blonde Empordanesa' with 'Blond Empordanesa'. The two broody breeds, 'Flor d'Ametller' and 'Gallina Pairal', were differentiated, which corroborates the latter as its own breed. We propose to add egg morphometric descriptions to chicken breed studies. These are based on weight but also on indexes. This kind of work, based on digital images, allows a minimal manipulation of eggs, so that they can be used for further studies allowing exchanges with other research groups.