Parâmetros genéticos de características produtivas e de bem-estar de codornas em gaiolas coletivas

• Ano de defesa: 2022
• Autor(a) principal: Bernardez Orellana, Lixsy Celeste
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Coturnix japonica; Comportamentos antagonistas; Interações sociais; Efeitos genéticos indiretos (IGE); Gaiolas coletivas
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/69189

The traditional raising of quails is done in collective cags since it is possible to house a larger number of birds in a smaller space and consequently increase profitability. However, this advantage becomes unfavorable for genetic improvement due to competitive and agonistic behavior among birds. This leads to reduced production, poor animal welfare, health problems, and in extreme cases increased mortality. In quantitative genetics, this type of phenomenon is called the associative effect or indirect genetic effect (IGE). Furthermore, mass-based selection processes do not take into account social interaction, reducing the accuracy of genetic parameter estimates. Given the above, this research aimed to evaluate and compare estimates of genetic parameters for indirect genetic effects associated with productive and welfare characteristics of quails housed in collective cages from uni and multitrait analyses, under the animal model. The experiment was carried out in two phases, first with 50 males and 150 females and in the second phase 52 males and 156 females from the progeny of the previous generation were housed in collective galvanized steel cages, these cages were identified from a number 1 to 50, in a proportion of one male to three females in each cage. The birds were around 180 days old at the beginning of the experiment and only animals of known pedigree and with no wounds or other phenotypic defects were used in the experiment. To allow social interactions to manifest themselves, the quails stain an adaptive phase for two weeks. After adaptation, the characteristics analyzed in the genetics were egg production, aggressiveness, wounds, plumage damage, survival, and weight variation, per bird, in one month of data collection. The results obtained in this study showed that compared to the simple model, the associative model is much more complex to run and interpret. In the parameter analyses of traits affected by social interaction, it was observed that the associative model redistributed the value of genetic variances, for all the traits evaluated. It was also observed that the total genetic variances assigned by the associative model were greater than the values found in the genetic variances of the simple model. One explanation for this result is due to the fact that in the associative model the total genetic variance is composed of a direct and an indirect additive genetic component. In this context, we conclude that models that do not include the social effect may result less favorable and may encourage an opposite response in selection.