The Effect of Phytase producer Bacteria in different periods on performance and digestibility of some minerals in Broiler Chicks

The aim of this study was investigation on the effect of phosphate solublizing bacteria in broiler diet on digestibility of some minerals (P, Ca, fe and Zn) and performance in broiler chicks. In this experiment phosphate solublizing bacteria (PSB) that isolated with screening soil samples collected from various region of Iran used as mixed to diet. The experiment included 320 one-day old broilers from ROSS strain in 3 periods, starter (1-21d) grower (23-35 d) finisher (36-49 d). Birds were randomly allocated to 4 treatments, with 4 replicates of 20 birds. Treatments include T1.Negative Control (basal diet, with no added probiotic); T2 – Negative Control + Probiotic (in starter, grower and finisher); T3 – Negative Control + Probiotic (in starter and grower) and T4 – Negative Control + Probiotic (in starter). In 49 d 4 birds randomly choose from each treatment and allocated in metabolic cage for 11 days, include 7 days adaptation and 4 days for samples collection. Phosphorus was determined with spectrophotometer. Chromic oxide, Ca, Fe and Zn were determined with atomic absorption. Results obtained shown that probiotic had significant effect on feed intake, weight gain and feed conversion ratio in entire of study and some periods (P<0.05).Probiotic significantly increased phosphate and calcium digestibility (P<0.05). However, phosphate solublizing bacteria didn’t have significant effect on Fe and Zn digestibility. These results strongly suggest that phosphate solublizing bacteria as a probiotic can improve performance and phosphate and calcium digestibility in broiler. However, more studies are needed to support this hypothesis.