Effect of age and oviposition time on egg quality and their relationship with stress, changes in blood cell components and pre-laying behavior in laying hens : 1-egg quality

الملخص EN

-The study is conducted at Meissan Company for table eggs production.

The aim was to investigate the effect of age and oviposition time on egg quality About 17000 ISA-Brown pullet at the age of 22 weeks are used in the study.

Eggs sampling is done during the morning and afternoon at different ages (22-38) weeks.

The results revealed the following : 1- Age showes highly significant (p < 0.

01) effect on egg shape, egg weight and its components, percent components, shell thickness, total calcium, magnesium and phosphorus in the shell, and cholesterol content in the egg.

On the other hand, age showes no significant effect on total shell ash, quantities of calcium, magnesium and phosphorus per a gram shell, and blood as well as meat spots in eggs.

2- Oviposition time showes highly significant (p < 0.

01) effect all of the egg quality traits mentioned above except the quantity of calcium per a gram shell.