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Khảo sát ảnh hưởng của Phytase lên sự ta8ngn trưởng và hiệu quả sử dụng thức ăn của cá Basa

Four diets having 30% crude proteins, 16.67 KJ/g gross energy have formulated to be supplemented either phytase at 750 and 1500 FYT (FYT: one unit of phytase is defined as the amount of enzyme that liberates 1 micromole of inorganic phosphorus per minute from 1.5 millimole sodium phytate solution at 370C and pH 5.5) (P1 and P2 treatments) or 1% dicalci phosphate (DCP treatment) or no supplemented phytase or dicalci phosphate (Control treatment). | 156 NGHIÊN CỨU KHOA HOC KY THUAT KHAO SAT ẢNH HƯỞNG CUA PHYTASE LEN Sự TANG TRƯỞNG VA HIỆU QUA SƯ DUNG THỨC AN CUA CA BASA Pangasius bocourtii STUDY OF PHYTASE EFFECT ON GROWTH PERFORMQAnCe AND FEED UTILIZATION FOR BASA CATFISH Pangasius bocourti Tran Ngoc Thiên Kim Le Thanh Hung Khoa Thuy San Đại hoc Nong Lam TP.Ho Chí Minh ABSTRACT Four diets having 30 crude proteins 16.67 KJ g gross energy have formulated to be supplemented either phytase at 750 and 1500 FYT FYT one unit of phytase is defined as the amount of enzyme that liberates 1 micromole of inorganic phosphorus per minute from 1.5 millimole sodium phytate solution at 370C and pH 5.5 P1 and P2 treatments or 1 dicalci phosphate DCP treatment or no supplemented phytase or dicalci phosphate Control treatment . After 8 feeding weeks the study shows that supplementation of 750 or 1500 units of phytase or 1 dicalcium phosphate DCP resulted in higher growth performance and feed efficiency when compared to the control. Next the 1 DCP and 750 FYT supplemented treatment had lower effect than 1500 FYT s treatment. Moreover phytase supplementation increased the mineral concentration calcium and phosphorus in skeleton bone and the whole body. Based on obtained data it is clear that phytase supplentation at 1500 FYT obviously increase growth performance and feed utilization in basa catfish through liberating bound phosphorus and other nutrient element in phytate. It also indicated that phytase completely replaces dicalci phosphate supplementation in cereal based diets. GIỚI THIÊU Trong nuoi thuy san protein thức an dong vai tro quyết dinh cho sự tang trứởng va phat trien vật nuoi. Thong thứờng nguon protein thức an dứa vao nguon ca tap hay bot ca san co. Tuy nhien ngay nay khuynh hứờng giam tỉ le sử dung bot ca trong thức an thuy san va chan nuoi ngay cang manh me. Ngoai tac dộng do gia ca con do tiến bo khoa hoc trong dinh dứờng cho phep thay thếbọt ca bang cac protein thức vạt san co re tien nhứng khong lam thay doi sức