Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Utilization of Plant Phytase to Improve Phosphorous Availability for Broiler

육계의 인 이용율 향상을 위한 식물성 Phytase의 이용

  • Kim, B.H. (Department of Animal Science, College of Industrial Science, Chung-Ang Uniyersity) ;
  • Namkung, H. (Department of Animal Science, College of Industrial Science, Chung-Ang Uniyersity) ;
  • Paik, I.K. (Department of Animal Science, College of Industrial Science, Chung-Ang Uniyersity)
  • 김병한 (중앙대학교 산업과학대학 동물자원과학과) ;
  • 남궁환 (중앙대학교 산업과학대학 동물자원과학과) ;
  • 백인기 (중앙대학교 산업과학대학 동물자원과학과)
  • Published : 2002.08.31
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Abstract

This study was conducted to evaluate the efficacy of wheat and wheat bran  as the source of phytase in a 5 week broiler feeding trial. One thousand day-old broiler chickens(Ross$^{(R)}$) were divided into 20 pens of 50 broilers(25 male and 25 female) each. Four pens were randomly arranged to one of the five dietary treatments: T1, control diet containing normal nonphytate P(NPP) ;  T2, T1 － 0.1% NPP; T3, T2 ＋ 600IU microbial phytase(NOVO$^{(R)}$) per kg diet; T4, T2 ＋ 600IU plant phytase from wheat and wheat bran; T5, T2 ＋ 600IU plant phytase from wheat and hydrothermally treated wheat bran. Reduction of NPP level by 0.1%(T2) reduced weight gain and feed intake but plant phytase treatments(T4 and T5) recovered the lost performance. Plant phytase treatments showed better (p<0.05) weight gain and intake than the microbial phytase treatment(T3). There was no difference between regular wheat bran treatment(T4) and hydrothermally treated wheat bran treatment(T5). Mortality was the highest by low NPP diet(T2). Availability of ether extract and crude ash of grower diet was the highest(p<0.05) in normal wheat bran diet(T4). Availability of Ca and P of grower diet was the highest(p<0.05) in T4 followed by T3 and T5. Availability of Mg, Fe and Zn was drastically improved by phytase treatments(T3, T4 and T5). Excretion of Ca, P, Mg, Fe and Zn was the lowest(p<0.05) with microbial phytase treatment(T3). Serum level of Ca and Mg was the highest(p<0.05) with the low NPP treatment(T2). Tibial ash content of T2 and T3 was lower(p<0.05) than that of T1, T4 and T5. However, tibial Ca content was higher(p<0.05) in T1 and T2 than other treatments. Tibial P and Mg contents were the highest(p<0.05) in T1. It was concluded that plant phytase from wheat bran can be effectively used to improve P utilization. Hydrothermal treatment of wheat bran prior to inclusion in the diet had no beneficial effects.

Phytase 공급원으로 밀과 밀기울의 첨가가 육계 생산성 및 P이용률에 미치는 영향을 측정하기 위해 5주간의 사양 실험을 실시하였다. 갓 부화한 1,000수의 병아리(Ross$^{(R)}$)를 20pen에 50수씩(암수 각 25수) 공시하여 5처리 4반복으로 완전임의 배치하였다. T1은 대조구로 정상수준의 nonphytate-P(NPP)를 함유하였고, T2는 T1 －0.1% NPP의 低 NPP구, T3는 T2 + 사료 kg당 600IU microbial phytase(NOVO$^{(R)}$)구, T4는 T2 + 밀과 밀기울로 사료 kg당 600IU plant phytase 공급구, T5는 T2 + 밀과 수침 후 건조 처리한 밀기울로 사료 kg당 600IU plant phytase 공급구 였다. NPP 수준을 0.1% 감소시킨(T2) 처리에서 생산성과 사료효율이 감소되었고 식물성 phytase 처리시(T4와 T5)에서는 생산성이 회복되었다. 식물성 phytase 처리구들(T4와 T5)이 microbial phytase 처리구(T3)보다 더 나은 결과를 보였다. 정상 밀기울구(T4)와 수침 후 건조 처리한 밀기울구(T5)와는 차이를 보이지 않았다. 폐사율은 低  NPP(T2)에서 가장 높았다. 육성 사료에서 조지방과 조회분 이용률에 일반 밀기울 처리구(T4)가 가장 높았다. Ca과 P의 이용률 또한 T4가 가장 높고 T3와 T5가 다음으로 높았다. Phytase 처리구 (T3, T4와 T5) 들은 Mg, Fe와 Zn의 이용률을 크게 증가시켰다. Ca, P, Mg, Fe와 Zn의 배설량은 microbial phytase가 가장 적었다. 혈청내 Ca과 Mg의 함량은 低 NPP에서 가장 높았고, 경골내 조회분 함량은 T2와 T3가 T1, T4와 T5보다 낮았다. 그러나 경골내 Ca 함량은 T1과 T2가 다른 처리구들보다 높았다. 경골내 P과 Mg의 함량은 T1구가 가장 높았다. 결론적으로 밀기울을 통한 식물성 phytase의 공급은 P 이용률 향상에 효과적이었다. 수침 후 건조처리하는 것은 이용률 향상에 도움이 되지 않았다.

Keywords

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