NUTRITIONAL APPROACHES TO MODIFY NITROGEN AND PHOSPHORUS IN BROILER MANURE

Abstract

The present study was carried out by a total number of 660 sixty unsexed one-day old of Cobb 500 broiler chicks. It divided over two experiments, first experiment comprised of 300 chicks which randomly distributed into ten treatments (30 birds each) used for evaluated the diets contain different levels of protein. On growth performance, carcass characteristics, some measurements for meat quality, some blood parameters, nitrogen retention and excretion, and economic efficiency. The experiment lasted from one to 42 day-old and contained 10 treatments diets (starter, and grower) that T1(100-100);contains 100% protein requirements of the strain according to manual guide at starter and grower period, T2(100-95), T3(100-90), T4(100-85), T5(95-95), T6(95-90), T7(95-85), T8(90-90), T9(90-85), and T10(85-85). Results of this treatments showed that, chick performance including daily weigh gain increased in broiler of T1, T5 than T10 through both of starter and grower period, While, overall six weeks, there were no significant differences in daily feed consumption among all treatments. Feed conversion ratio during growing period and overall six weeks from hatching until marketing weight was non-significant differ among all treatments. Concerning of carcass traits, T1 and T2 had higher (P<0.05) values of dressing percent than all other treatments. Decreasing dietary CP generally tended to increase the relative weights of the liver and abdominal fat, although such increases were not significant. Higher heart percent, abdominal fat, wings and skin in broiler of T7 than those. Decreasing CP level in dietary increasing heart % up to certain level of CP requirement and then decreased again.T4, T5 and T10 were significantly lowest records of neck than T2, T7 then T6.There were