Effect of different continuous and discontinuous methods of using enzyme in broiler diet on effect performance and carcass characteristics

The purpose of this study was to compare the different ways of using enzyme in diet on performance, carcass characteristics, overall mortality and litter moisture in broilers. This experiment was carried out on a of 750 total unsexed broiler chickens of the Ross 308 distributed in six experimental treatments. A completely randomized design with five replicates (25 broiler chicks in each replicate) was utilised. Experimental treatments were 1- control diet based on corn-soybean, without multiple enzyme and five treatments based on wheat-barley and different in ways of using multiple enzyme (2- wheat-barley based diet plus enzyme continues 3- enzyme added every other day 4- enzyme added every two days 5- as 2 but enzyme added up to 42 days of age 6- as 2 but enzyme added up to 35 days of age). All dietary treatments were iso-energetic, containing 2900 kcal/kg. The results indicated that birds fed with treatment 3 had greater weight gain while the best feed conversion ratio was observed in treatment 6 (P<0.05).  Likewise, birds which received treatments 1 and 5 had higher litter moisture (P<0.05). There were no significant differences among the treatments in terms of overall mortality and carcass characteristics. Finally, the results indicatedthatthere were no significant differences between treatments 1, 2 and 3 in terms of broiler performance. Given the fact that discontinuous use of enzyme could radically reduce feed costs, this method could also potentially be effective in reduction of costs of imports.