Impact of Strain, Different Levels of Commercial Multi Enzymes and their Interaction on Broilers Performance and Carcass traits.

Abstract

The present study aimed to evaluate the effect of strain (Avian and Cobb), different levels of commercial multi enzymes (Phytabex Plus) and their interaction on broilers performance, carcass traits and economic efficiency. A total of 180 day-old broilers chicks (90 Cobb and 90 Avian strain) were used in this experiment. Chicks within each strain were fed three experimental diets; one of them was used as a control diet, the other two groups were fed the same basal diets supplemented with commercial multi enzymes (100 and 200 g/ton). Results indicated that live body weight at 3 wks of age was significantly affected by strain, different levels of enzymes and their interaction. Cobb chicks were significantly heavier body weight compared to Avian strain. Chicks fed diets supplemented with multi enzymes (100 and 200 g/ton) had heavier body weight compared to those fed control diet at 3 wks of age. Daily feed consumption was significantly affected by interaction between strain and enzymes. The Avian strain had significantly higher carcass weight, dressing percentage and relative edible meat parts compared to Cobb strain. While, Cobb chicks had significantly higher heart percentage in comparison with Avian chicks. On the other hand, dressing and gizzard percentages were significantly affected by interaction between strain and enzymes. Avian strain had significantly higher relative abdominal fat weight compared to Cobb strain. Broilers at marketing age (5 wks) fed diets supplemented with multi enzymes (100 and 200 g/ton) had lower abdominal fat percentage compared to those fed control diet. In this study, breast percentage of broiler strains fed control diet represented only 92.5 % of that fed diet supplemented with multi enzymes (200 g/ton). Consequently, enzymes additives in broilers diets lead to increased breast meat by 7.5 %. Cobb strain has superiority and genetically potency for productive and economic efficiency than Avian strain. Supplementation of commercial multi enzymes in Cobb broiler diets by 200 g/ton had the best economical and relative efficiency values.