الفهرس 
Carcass traitsOnly 14 pages are availabe for public view
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Abstract
•Introduction: For many years, poultry industry has been looking for improvement of production indexes and broiler growth through breeding changes. The using of growth promoters in rabbit and poultry production has increased in order to improve the net return of the breeders. These growth promoters include antibiotics, enzymes , pre- and probiotics .. etc. There is currently world trend to reduce the use of antibiotics in animal food due to the contamination of meat products with antibiotic residues. Recently, alternatives for substituting these traditional growth promoters have been evaluated and probiotics and enzymes have been the most studied. •Aim of the study: to investigate the effects of Zinc-Bacetracin, Porzyme and Primalac addition to growing rabbit diets on their performance, feed utilization, carcass traits, blood plasma constituents. • Materials and methods: Forty-eight New Zealand White male rabbits at 7 weeks of age were divided into four groups. Each group was assigned to one of four experimental diet: The basal complete pelleted diet and during manufacturing, the basal diet supplemented with Zinc-Bacetracin (0.5 g /kg) or Porzyme (1.0 g/kg) or Primalac (1.0 g/kg). Digestibility and slaughtering tests were carried out. Blood plasma was obtained. Some productive traits were recorded. •Results: The obtained results showed that the enzyme preparation (Porzyme) and probiotics (Primalac) are good alternatives for antibiotic (Zinc-Bacetracin) as growth promoters in rabbit diets. •Recommendations: We can recommended that it is possible to replacing the Antibiotic by Enzymes or Probiotics in rabbits diets and get acceptable scientific and practical results.