Parâmetros qualitativos de ovos comerciais das linhagens Hy-Line W80 e Hisex White em diferentes estágios de postura

Abstract

Brazilian laying poultry is an activity that has an industrial character, largely consolidated, most of the eggs produced, come from systems that use high technology. In poultry, unlike other animal species, much is mentioned about commercial strains, the use of different strains available in the genetic market today, allows a greater variety of products. Lineage, can be defined as a family or group of animals previously selected for a specific production aptitude, which will more vigorously present the desired performance, the term lineage, is directly related to the genetic evolution arising from intentional crossings. The present work aims to evaluate the quality of eggs from two commercial strains of laying hens at different ages. 600 eggs from the Hy-Line W80®, Hisex White® lineages housed in acclimatized sheds were used, for each age, 150 recently laid eggs were collected, selected before the quality analyses. The design used was completely randomized (DIC), each treatment was represented by a line and the repetitions were represented by the number of eggs (60) analyzed in each treatment. The evaluated variables were: egg weight, albumen weight, yolk weight, albumen %, yolk %, shell %, haugh unit, yolk index, thickness and shell strength. Data were submitted to analysis of variance, in comparisons of means Tukey's test was used at 5% significance (p<0.05). In the qualitative analysis of eggs at 40 weeks, there was a significant effect between the lines for the variables: egg weight, albumen weight, yolk weight, yolk %, haugh unit, yolk index and shell strength. With 46 weeks of production, there was an effect on the variables: bark weight, % of bark, haugh unit, yolk index, shell thickness and shell strength, and later, with 62 weeks, for the variables: shell weight, % of bark, haugh unit and yolk index. The Hisex White® strain showed better overall quality in the variables evaluated at 40 weeks of production. For 46 and 62 weeks of production, the Hy-Line W80® strain proved to be more efficient in terms of the overall quality of the evaluated variables, demonstrating that with advancing laying age, the strain is the one that best responds to the inevitable decrease in quality loss of the eggs.