Document Type : Research Paper
Authors
- Payam Panahi-Moghaddam
- Yahya Ebrahimnezhad
- Naser Maheri-Sis
- Habib Aghdam-Shahryar
- Abolfazl Aghajanzadeh-Golshani
- Abolfazl Ghorbani
Department of Animal Science, Faculty of Agriculture and Veterinary Medicine, Shabestar Branch, Islamic Azad University, Shabestar, Iran
Abstract
The purpose of this study is to investigate the effects of using multi-enzyme on performance, digestibility, intestinal microbial population and viscosity and pH of the digestive system of broiler breeders aged 45-60 weeks. For this purpose, 260 broiler breeders of Ross 308 strain were used in a completely randomized design with four treatments and five replications (13 hens and one rooster per replication). Experimental treatments include: 1) positive control (diet with standard energy and phosphorus and without multi-enzyme), 2) negative control (diet with 5% energy and 50% less phosphorus than standard and without multi-enzyme), 3) negative control diet with 1 g/kg multi-enzyme and 4) positive control diet with 1 g/kg multi-enzyme. The results showed that the negative control diet caused a significant decrease in egg laying percentage, egg weight and mass, and increased feed conversion ratio. Using 1 g/kg of multienzyme in the negative control diet made the above parameters similar to the positive control treatment. The positive control diet containing multi-enzyme increased the digestibility of dry matter, calcium and phosphorus compared to other treatments (P<0.05). The negative control diet containing multi-enzyme reduced the viscosity of jejunum contents compared to the negative control treatment (P<0.05). In general, feeding old broiler breeders with a diet of 5% energy and 50% phosphorus less than the standard caused a decrease in performance, digestibility of dry matter, crude protein and phosphorus, and an increase in intestinal viscosity, which were improved by adding multi-enzyme to the aforementioned parameters.
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