Abstract
Broiler breeder age is one of the most important factors that affects on egg properties. However by increasing the age of broiler breeder flock, the quality of eggs and consequently the quality of their chick products would be changed. In order to study the effect of broiler breeder flock age on the various aspects of chick products, 300 fertilizable eggs were selected randomly, from 3 broiler breeder farms. Selected eggs were collected from broilers that were 30 (young), 36 (peak), 43(after peak), 53 (old), 60 (very old) and 82 (molted) weeks old. Collected eggs were stored during 3 to 4 days in the ambient temperature. Qualitive and quantitive aspects of eggs including egg weight, albumen height yolk, height thickness of egg shell, yolk color, Albumen and yolk PH and Hugh unit were studied. Trait Analysis was done by ANOVA procedure of SAS statistical software. To compare the means, Duncan test was used. The effects of age and breeder farms on the egg weight, yolk color, yolk and albumen PH, yolk and albumen height, shell egg thickness and Hugh unit were significant (p<0.05). The lowest difference was seen between the age of 53, 60 and 82 week old (p<0.05). Albumen PH and alkaline is increased by increase of age, but yolk PH is the variance. Influence of age on the traits including yolk and albumen height and Hugh unit was decreased and the color of yolk was faded by increasing age. According to obtained results from these research performances of ages of 53, 60 and 82 weeks are close together. We could conclude that older broiler breeder flocks are produce the better qualitive and quantitive properties of egg products. Since most poultry enough information about the quality of breeder chickens and the best age to have chickens, using the results of this study can be answered many questions.
Highlights
Bird’s age is one of the natural effective factors on the daily product and quality of egg in a flock the size of eggs is elated to the weight, and to the age
In order to study the effect of broiler breeder flock age on the various aspects of chick products, 300 fertilizable eggs were selected randomly, from 3 broiler breeder farms
According to the findings of this research there were the lowest significant differences between of Dorna Jouje Delijon and Zarbal farms, while most significant differences were between Dorna Jouje Shomal and other farms
Summary
Bird’s age is one of the natural effective factors on the daily product and quality of egg in a flock the size of eggs is elated to the weight, and to the age. In the start of laying period, eggs hell thickness is very more than he end of product. By increasing age of broiler, eggs shell thickness is more thinned. Weak quality of the egg shell influences on the inner quality of eggs during laying or hatchery period. The most information about quality of egg shell, has achieved during last 50 years. A factor causes to crack and weakness of eggs, and, today, more factors have been known which affects on the quality of eggs. Some of the mentioned factors are included nutrient levels, diseases, managements, environment and modification of spices
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