사료 내 조단백질 및 Phytase 첨가 수준이 육계 후기의 생산성, 소화율 및 분뇨 내 질소, 인 함량에 미치는 영향

다국어 초록 (Multilingual Abstract)

This study was conducted to investigate the effects of crude protein (CP) and Phytase levels in finisher broiler diet on performance, digestibility, and nutrient and phosphorus contents in manure. The experimental design was a 3 × 3 composite factor design with three levels of CP (19%, 18%, and 17%) and three levels of Phytase (1,000, 800, and 500 FTU/kg), resulting in a total of nine treatments, four replicates per treatment, and five birds per replicate in a completely randomized manner. A total of 180 male broiler chicks (one-day-old, 33.9±0.94 g) were divided into nine treatments (five birds/replicate). Body weight, weight gain, feed intake, and feed conversion ratio did not significantly differ according to CP and Phytase levels. Digestibility of dry matter, CP, ether extract, nitrogen, and phosphorus was significantly lower only in the 17% CP treatment (P<0.05). The nitrogen content in manure was the highest in the 19% CP treatment (P<0.05), and the phosphorus content was the highest in the 500 FTU/kg Phytase treatment (P<0.05). In conclusion, considering performance, digestibility, and excretion of nitrogen and phosphorus in broilers, it is recommended that the CP level can be reduced to 18% and the Phytase level to 800 FTU/kg.