Variação do grau de crença na avaliação genética de codornas de postura (Coturnix coturnix japonica) sob seleção

Abstract

The present work was carried out with data from a population of laying quail under core selection, with the objective of studying the modifications that occur in the estimation of genetic parameters for total egg production when the degree of belief is altered in the establishment of the model for analysis by means of the Bayesian method. The degrees of belief were used: three, ten, 20, 30, 40, 50, 100, 500, 1000 and 10000. The total 180-day egg production of laying quails under selection had mean and standard deviation of 115.632 ± 18.1306 eggs. Considering the a priori information for the estimates of additive and residual genetic variance fixed in 25 and 50 eggs[quadrado], respectively, changes were obtained in all estimates when the degree of belief was altered. Heritability with the lowest belief level (3) was 0.11, with the highest belief grade (100,000) was 0.33. Considering the a priori information for the estimates of additive and residual genetic variance fixed in 50 and 100 eggs[quadrado], respectively, also occurred changes in all estimates when the degree of belief was changed. Heritability with the lowest belief level (3) was 0 , 12, with the highest degree of belief (100,000) was 0.33. In both cases, the credibility interval and high-density region estimates of variance and heritability components became narrower with increasing beliefs. Therefore, the increase of the degree of belief allows for estimates of larger magnitudes and better precision, improving the parameter estimates. However, the use of this feature requires prior knowledge of the feature in question.