تأثير الشكل الفيزيائي للخلطات العلفية و الإضاءة المتقطعة في مواصات الذبيحة للفروج

Abstract EN

This research was carried out during 2013.

A total of 559 one day- old broiler chicks of hybrid cubb500 were divided randomly into six groups, with three replicates in each.

Birds were fattened in a closed section of the pen and reared on a deep litter till 49-day of age.

All groups were fed three diets according to age.

Birds husbandry was the same for all groups.

However, the first, second and third groups were fed mash diets, whereas the fourth, fifth and sixth groups were fed pellet diets.

All groups were exposed from one dayold till 14-day-old to a continuous lighting system, and from there yill the 49day-old three different lighting systems were applied as following.

The first and fourth groups were exposed to a continuous lighting system (day and night), the second and fifth groups were exposed to a continuous lighting system during the day light (12 h continuous) and intermittent lighting at night (2h light: 2h darkness), the third and sixth groups were exposed to the intermittent lighting system during the daylight and the night (1h Light: 2h darkness).

The results showed.

Results indicated that feeding birds diets as pellets led to a significant decrease in the percentage weight of the gizzard and a significant improvement in carcass yields and the percentages of breast muscles, the thigh muscles, under the thigh and abdominal fat.

The application of continuous lighting during the daylight (12L) and intermittent lighting at night (2L:2D) had led to a significant decrease in the rate of the loss of body weight as a result of starvation process before slaughtering and to a significant improvement in the rate of breast muscles compared with those exposed to continuous lighting system.