تأثير إضافة بعض محفزات النمو في مواصفات الذبيحة و الأوزان النسبية للأعضاء الداخلية عند الفروج

Abstract EN

This study was conducted to investigate the effect of adding some growth stimuli on carcass characteristics and relative weights of internal organs of broiler.

A total of /450/ hybrid commercial chicks(Hubbard Flex) were reared from 1 to 42 days of age.

Chicks were distributed into five groups; each group contained 90 birdswith three replicates.Five diets were used the first the traditional diet (control group) and the others differed in the growth stimulus added and were as follows: nutritional antibiotic (Lincomycin) for the second group, probiotic (Bacillus subtilis)for the third group, prebiotec (manna oligosaccharide) for the forth group and finally a mixture of organic acids for the fifth group.Results showeda significant increase (P<0.05) in the carcass yield of group3 and 5 compared with other groups.

Birds of group2, 3 and 5 had higher yield(P<0.05)of breast muscle than the control group.

The abdominal fat percentage decreased significantly (P<0.05) in birds of the different groups compared to the control group.

The same was found regarding relative weights of the internal organs at (04) days of age, asno significant effects of growth stimuli used were observed in the relative weight of internal organs (heart, spleen, liver, proventriculus and gizzard) even though percentages of some of these organsin certain groups differed from control group.

Birds of group 2,3 and 5showed higher values (P<0.05)of Bursa of Fabricius and small intestine weights compared with control birds.