Resumo

ROMERA, Bernardo Martín et al. Relación yema:albumen en huevos de tres genotipos de gallinas ponedoras destinadas a sistemas semiintensivos. Analecta vet. [online]. 2022, vol.42, n.1, e064. ISSN 1514-2590.  http://dx.doi.org/https://doi.org/10.24215/15142590e064.

The dynamic behaviour of the yolk: albumen ratio was studied in eggs from hens of the three-way cross Campero Casilda compared to Negra INTA and Rhode Island Red. Eggs (n=15) were randomly collected from each genetic group every four weeks between 26 and 70 weeks of age. The proportions of yolk and albumen and the relationship between them were calculated. Yolk proportion and yolk albumen ratio data as a function of age were adjusted with the Brody function and albumen proportion with analyzed using an exponential decay model. Campero Casilda eggs showed a similar proportion of yolk to Negra INTA at the beginning and a higher one at the end of the productive cycle. Rhode Island Red presented the lowest proportion of yolk, the highest proportion of albumen and the lowest yolk: albumen ratio. The lowest albumen proportion and the highest yolk albumen ratio corresponded to Campero Casilda while Negra INTA showed intermediate values of both traits. The higher content of total solids in Campero Casilda eggs constitutes a comparative advantage in terms of nutritional value, a relevant feature when considering the human population with unsatisfied basic needs to which this genotype is particularly destined.

Palavras-chave : nonlinear regression; dynamic behaviour; Brody function; exponential decay model; free-range hens.