Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effect of Dietary Phytase on the Excreta Excretion of Laying Hens

사료 내 Phytase 첨가가 산란계의 분뇨 배설량에 미치는 영향

  • 홍의철 (농촌진흥청 국립축산과학원) ;
  • 나승환 (농촌진흥청 국립축산과학원) ;
  • 유동조 (농촌진흥청 국립축산과학원) ;
  • 김학규 (농촌진흥청 국립축산과학원) ;
  • 박미나 (농촌진흥청 국립축산과학원) ;
  • 정기철 (농촌진흥청 국립축산과학원) ;
  • 추효준 (농촌진흥청 국립축산과학원) ;
  • 박희두 (농촌진흥청 국립축산과학원) ;
  • 정완태 (농촌진흥청 국립축산과학원) ;
  • 황보종 (농촌진흥청 국립축산과학원)
  • Published : 2009.09.30
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Abstract

This work was conducted to investigate the effects of phytase on N and P excretion of laying hens excreta. Three hundred sixty ISA Brown layers were selected to investigate excreta excretion for 65 weeks and to investigate the effect of phytase on total excretion and N and P excretion of layers from 55 weeks. The experimental diets were fed the starter (0~5 wk), grower (5~12 wk), developer (12~16 wk), prelay diets (16 wk~first egg), layer diets for starting period (first egg~32 wk), middle (32~45 wk), finishing diets (45~55 wk, 55 wk~). Thirty ISA Brown layers were selected to investigate the effect of phytase supplementation on total N and P excretion of layers at 55 weeks and assigned randomly to 3 treatments groups (10 birds/treatment) and phytase was added to basal diets at 300 and 600 FTU/kg. Average body weight, feed intake, water intake, and excreta excretion were 1,622, 105.7, 187.2 and 124.7 g/bird/day, respectively. Excreta of birds fed phytase were DM (33.2, 31.2, 30.5 g/day), N (0.46, 0.42, 0.40 g/day) and P (0.51, 0.49, 0.48 g/day) and reduced as dietary phytase increased, Finally, dietary phyase can reduce the N and P excretion, but the amount of excreta was not different depending from the phytase addition in layers. This work investigated the N and P excretion of laying hens excreta and were considered that dietary phytase can reduce the N and P excretion for short period.

본 시험은 사료 내 phytase 첨가가 산란계의 분뇨 배설량 및 질소와 인의 배설량에 미치는 영향을 구명하기 위해 수행되었다. 시험에 사용된 닭은 1일령 ISA Brown종 산란계(평균체중 $44.7{\pm}1.5\;g$) 360수이며, 65주령에 걸쳐서 분뇨 배설량 및 55주령에서 phytase의 첨가에 따른 총 배설량과 질소와 인의 배설량에 미치는 영향을 조사하였다. 시험 사료는 옥수수-대두박 위주의 육계 사료를 육성기와 산란기로 분류하고, 육성기는 초생추(0~5주령), 중추(5~12주령), 대추(12~16주령)와 산란 전(16주령~초란), 산란기는 산란 초기(초란~32주령), 전기(32~45주령), 후기(45~55주령), 말기(55주령~)로 나누어 급여했다. Phytase의 첨가에 따른 55주령의 산란계 총 배설량 및 질소와 인의 배설량에 미치는 영향을 조사하기 위하여 후기 기초사료에 phytase(0, 300, 600 FTU/kg)를 첨가하여, 총 3처리구, 처리구당 10수씩 대조구와 유사한 체중별로 선별하여 완전임의 배치하였다. 산란계의 전 시험기간 중 평균 체중과 사료 섭취량, 음수량 및 분뇨 배설량은 각각 1,622 과 105.7 g, 187.2 mL 및 124.7 g/수/일로 조사되었다. Phytase의 첨가에 따른 분뇨 배설량은 건물(33.2, 31.2, 30.5 g/일) 및 질소(0.46, 0.42, 0.40 g/일)와 인(0.51, 0.49, 0.48 g/일)으로서 Phytase의 첨가에 따라 감소하였으며, phytase의 첨가량에 따른 차이는 없었다. 그러나 건물 분뇨 배설량에서 phytase 무첨가구와 300 FTU/kg phytase 첨가구간에는 유의적 차이가 없었다. 본 시험을 통하여 산란계의 총 배설량 및 질소와 인의 배설량을 조사하고, 단기간의 phytase 첨가도 산란계의 분뇨 배설량 및 질소와 인의 배설량을 감소시킬 수 있을 것으로 사료된다.

Keywords

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