육계 사료내 phytase 첨가시 성장률, 육질특성, 영양소 소화율 및 인 이용율에 미치는 영향 미치는 영향

Abstract

ABSTRACT The study was conducted to evaluate effects of dietary phytase on growth performance, meat quality, nutrient digestibility and phosphorus utilization in broilers. Breeding experiment, a total of 480 Arbor acre broilers chicks of 2 days old were randomly divided into 3 treatments with 8 replicates of 20 birds each. The treatments were CON (basal diet), LP (Low phosphorus diet) and CP (Low phosphorus diet + 0.05% coated phytase). Metabolism experiment 2, a total of 96 Arbor acre broilers chicks of 5wks old were randomly divided into 4 treatments with 8 replicates of 3 birds each. The treatments were CON (basal diet), LP (Low phosphorus diet), NP (Low phosphorus diet + 0.05% normal phytase) and CP (Low phosphorus diet+ 0.05% coated phytase). Weight gain was significantly increased in CON treatment than LP and CP treatments (P<0.05). F/G in CON and CP treatments was improved than LP treatment (P<0.05). Calcium contents in blood was increased for CP treatment compared to LP treatment (P<0.05). However, Phosphorus in blood was higher in CON treatment compared to LP treatment (P<0.05). Carcass and CIE a* of breast meat were significantly increased in CON treatment than LP treatment(P<0.05). WHC of breast meat was improved for CON and CP treatments compared to LP treatment (P<0.05). Digestibilities of dry matter and nitrogen were higher in CON treatment compared to LP treatment (P<0.05). Crude ash was greater in CON treatment than CP treatment (P<0.05). Calcium was improved for broiler fed CON and CP treatments compared with LP treatment (P<0.05). Digestibility of phosphorus was significantly reduced in LP treatments than CON and CP treatments (P<0.05). CP treatment was significantly increased their dry matter intake, calcium intake and nitrogen retention compared to LP treatment (P<0.05). CON treatment was significantly increased their phosphorus intake and phosphorus retention compared to other treatments(P<0.05). Calcium retention was higher in CON and CP treatments than LP treatment (P<0.05). Phosphorus excretion was significantly reduced in NP treatment than CON and LP treatment (P<0.05). Nitrogen and calcium excretion were significantly reduce in CON treatment than other treatments (P<0.05). In conclusion, Phytase treatment improved performance and decreased calcium and phosphorus excretion in broilers.(