Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effects of Dieatry Phytase on Performance, Excretion and Retention of P, and Ileal and Feces Digestibility in Broilers

Phytase 수준별 급여가 육계의 생산성, 인의 배설과 흡수 및 회장과 분에서 소화율에 미치는 영향

  • HwangBo, J. (National Institute of Animal Science) ;
  • Ahn, J.H. (National Institute of Animal Science) ;
  • Chung, W.T. (National Institute of Animal Science) ;
  • Ohh, S.J. (Institute of Animal Science Resources, Kangwon National University) ;
  • Lee, H.J. (National Institute of Animal Science) ;
  • Kim, W. (Hanilfeed, Co., LTD.) ;
  • Lee, S.U. (National Institute of Animal Science) ;
  • Hong, E.C. (National Institute of Animal Science)
  • Published : 2007.09.30
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Abstract

This work was carried out to assess the effect of microbial phytase (MP) on the performance, retention and excretion of phosphorus, and nutrients availability in broiler chicks. Two hundred and sixteen one day old Ross strains broiler chicks were used to investigate on performance for 5 weeks (earlier $(0{\sim}2wk)$, finisher $(3{\sim}5wk)$) and were divided 3 treatments, three cages per treatment and 12 birds per cage. Treatments are P0 (basal diet), P1 (microbial phytase 300 FTU/kg), and P2 (microbial phytase 600 FTU/kg). After 5 weeks, three diets containing 0, 300, 600 FTU/kg of microbial phytase were fed to 5-wk-old broilers to assess the digestibility. Twenty seven broilers were divided into 3 treatments (9 birds per treatment) to investigate on the absorption and retention of phosphorus and nutrient digestibility. Body weight gain and feed efficiency were highly significant at P1 and P2 treatments compared to those of P0 (P<0.05), however, feed intake was no significant difference among all treatments (P>0.05). The excretion of phosphorus decreased in P1 and P2 compared to P0 (P<0.05). The digestibility of nutrients and amino acid was high in P1 and P2 treatments compared to P0 (P<0.05). Ileal digestibility was lower about $1{\sim}2%$ than feces digestibility (P>0.05). Finally, microbial phytase influenced on the performance, the retention and excretion of phosphorus and ileal and feces digestibility in broilers.

본 시험은 파이타제의 수준별 첨가(0, 300, 600 FTU/kg)가 육계의 생산성, 영양소 소화율, 장내 미생물 성상 및 영양소 이용률에 미치는 영향을 구명하고자 실시하였다. 공시 동물로서 1일령 Ross종 육계$(44.5{\pm}2.0\;g)$ 216수를 선별하여 육계전기($0{\sim}2$주) 및 육계 후기($2{\sim}5$주)의 5주 동안 사양 시험을 실시하였다. 처리구는 파이타제의 첨가 수준에 따라 P0(대조구), P1(300 FTU/kg), P2(600 FTU/kg)의 3처리구로 나누고, 처리당 6반복, 반복당 12수씩 216수를 체중별로 완전 임의 배치하였다. 사양 시험이 끝난 후 체중이 유사한 5주령 육계$(1.7{\pm}0.2\;kg)$를 처리구당 9수씩 선별하였으며, 처리구는 파이타제의 첨가 수준에 따른 3처리구와 회장과 분의 소화율에 따른 2처리구로 나누어 $3{\times}2$의 총 6처리구, 처리당 9수씩 54수를 공시하여 소화 시험을 실시하였다. 증체량과 사료 효율은 P0 처리구에 비해 P1과 P2 처리구에서 유의적으로 높았으나(P<0.05), 사료 섭취량은 처리구간에 큰 차이가 없었다(P>0.05). 인의 배설량과 흡수량은 파이타제 첨가구에서 대조구에 비해 배설량이 크게 감소하였다(P<0.05). 영양소와 아미노산의 소화율은 회장 소화율이 분 소화율보다 낮게 나타났으나 유의적인 차이는 없었으며(P>0.05), 파이타제 첨가구(P1, P2)에서 대조구(P0)에 비해 유의적으로 높았다(P<0.05). 그러나 고형물과 조단백질의 소화율은 처리구간에 차이가 없었다. 결론적으로, 파이타제의 첨가는 육계의 생산성이나 인의 흡수량과 배설량 및 영양소와 아미노산 소화율에 영향을 미치는 것으로 사료된다.

Keywords

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