University of Tehran Iranian Journal of Veterinary Medicine 2251-8894 7 4 2014 01 01 An investigation of the effects of using an enzyme-probiotic combination on broilers performance بررسی اثرات استفاده توام آنزیم–پروبیوتیک بر عملکرد جوجه های گوشتی 299 304 36291 10.22059/ijvm.2013.36291 EN Saeed Seifi Department of Clinical Sciences, Faculty of Veterinary Medicine, Amol University of Special Modern Technologies, Amol, Iran Journal Article 2013 09 09 BACKGROUND: Growth promoters are chemical and biological<br />substances that are added to livestock food with the aim<br />to improve the growth of chickens in fattening and the utilization<br />of food, and in this way achieve better production and financial<br />results. OBJECTIVES:An experiment was conducted to evaluate<br />the effects of enzyme complex, probiotic, and their combination<br />on performance of broilers fed a basal wheat-barley-soybean<br />meal diet from 1 to 47 d of age. METHODS:Atotal of 480-dayold<br />male broiler chicks (Arbor Acres) were randomly assigned to<br />6 treatments, with 4 replicate cages per treatment and 20 birds per<br />cage. The experiment consisted of a 3×2 factorial arrangement<br />of the treatments, with 3 concentrations of enzyme complex (0,<br />half of the commercial suggested level or commercial suggested<br />level) and 2 concentrations of probiotic (0 and suggested level).<br />RESULTS: Results showed that the suggested level of enzyme<br />complex could improve body weight and feed conversion ratio<br />(p<0.05), but addition of probiotic only decreased the feed<br />conversion ratio (p<0.05). There was no interaction between<br />enzyme complex and probiotic on performance (p>0.05).<br />Probiotic supplementation did not improve the efficacy of<br />enzyme complex at any levels. The examination of length and<br />relative weight of different regions of intestine showed that only<br />enzyme complex could decrease the relative weight of duodenum<br />and length of jejunum; however, there was no interaction<br />between treatments for these parameters. CONCLUSIONS: This<br />research did not demonstrate any interaction effect between<br />enzyme complex and probiotic on broilers performance fed<br />wheat-barley-soybean meal diet. https://ijvm.ut.ac.ir/article_36291_4aa114577b17d3f07e14cd613454bd32.pdf