본 시험은 사료 내 phytase 첨가가 육계 암수의 생산성과 분뇨 배설량 및 질소와 인의 배설량에 미치는 영향을 구명하기 위해 수행하였다. 공시계는 1일령 Ross종 육계(평균체중 $44.7{pm}1.5$ g) 192수를 선별하였으며, 육계의 성별(male, female)과 phytase 첨가 유무(0, 300 FTU/kg)에 따라 $2{ imes}2$의 총 4처리구, 처리당 4반복, 반복당 12수씩 체중별로 완전임의 배치하였다. 시험 사료는 육계 초기(0~2주), 전기(2~4주)와 후기(4~7주)의 기초 사료에 phytase를 첨가하였다. 증체량은 수컷이 암컷에 비해 높게 나타났으며, phytase 첨가구가 높게 나타났다(P<0.05). 사료 섭취량은 수컷이 암컷에 비해 높았으며, phytase 첨가 유무에 따른 차이는 없었다(P>0.05). 사료 효율은 phytase 첨가구의 수컷에서 가장 높게 나타났다(P<0.05). 분뇨 배설량은 수컷이 높게 나타났으며, phytase 첨가구에서 감소하였다(P<0.05). 질소와 인의 배설량은 수컷이 높았으며, phytase 무첨가구가 첨가구에 비해 높았다(P<0.05). 따라서, 사료 내 파이타제 첨가 시 육계의 생산성이 개선되고, 분뇨, 질소 및 인의 배설량이 감소된다.
This work was conducted to investigate the effects of phytase on the growth performance, excreta excretion, and N and P excretion of broilers for 7 weeks. One hundred ninety two Ross broiler (one-day-old) with average weight $44.7{pm}1.5$ g were assigned randomly to 4 treatments groups (12 birds/pen, 4 pens/treatment) as $2{ imes}2$ complex factors of sex of broiler male, female) and phytase 2 treatments (0, 300 FTU/kg), and fed experimental diets for 6 weeks (starter, 0~2 wk; earlier, 2~4 wk; finisher, 4~7 wk). The experimental diets included that phytase was added to the basal diet. Body weight was high at male treatment and at phytase treatment. Feed intake was high at male treatment and was no difference between phytase and non-phytase treatment. Feed efficiency was the highest at male and phytase treatment. Manure excretion was high at male treatment and reduced at phytase treatment. Excretion of N and P was high at male treatment and at non-phytase treatment. Finally, when phyase was added to basal diet, the growth performance of broilers was improved and excreta excretion and N and P excretion of broilers were decreased.
