Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effects of Dietary Phytase on Performance, Egg Quality, Excretion of N and P, and Ileal Digestibility in Laying Hens

Phytase 첨가가 산란계의 생산성, 난질, 질소와 인의 배설량 및 회장 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, H.K. (National Institute of Animal Science) ;
  • Lee, S.U. (National Institute of Animal Science) ;
  • Hong, E.C. (National Institute of Animal Science)
  • Published : 2007.06.30
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Abstract

The effects of microbial phytase on laying performance, egg quality, and ileal digestibility of nutrients and amino acids were examined at three levels of phytase (0, 300, 600 unit/kg) in 55-wk-old White Leghorn for 4 weeks. Egg productivity tended to increase with supplemental phytase compared to that of control. Daily feed intake of hens fed phytase also increased. Egg shell thickness was not significantly different among the treatments. Haugh unit and yolk color were not statistically different. However, egg shell breaking strength was high at phytase treatment. Excretion and absorption of nitrogen were no difference among all treatments, but those of phosphorus was higher in the phytase treatment than control. The digestibility was high at crude fiber, crude ash, calcium and phosphorus in nutrients, at lysine, methionine and phenylalanine in essential amino acids, and alanine, cystine, glutamic acid, glycine and tyrosine in non-essential amino acids. In conclusion, supplemental microbial phytase in laying hens diet may help to improve egg production and to decrease P of feces. But, further studies were needed to investigate on the digestibility.

산란계의 생산성, 계란 품질, 질소와 인의 흡수량과 배설량 및 회장 소화율에 미치는 파이타제의 첨가 효과를 구명하고자 사료에 0, 300, 600 FTU/kg의 파이타제를 첨가하여 4주간 사양 시험 종료후 1주간 대사실험을 실시하였다. 공시동물은 산란율이 유사한 55주령 White Leghorn 산란계 162수$(1.6{\pm}0.3\;kg)$를 공시하였으며, 처리구는 첨가 수준에 따라 P0(대조구), P1(300 FTU/kg), P2(600 FTU/kg)의 3처리구로 나누고, 처리구당 6반복, 반복당 9수씩 완전임의 배치하였다. 산란율은 파이타제 첨가 수준에 따라 증가하였다. 계란 품질은 난중, 난각 두께, 하우유니트와 난황색 모두 처리구간에 차이를 보이지 않았으나(p>0.05), 난각 강도는 파이타제 처리구에서 4주째에 각각 3.86 $kg/cm^2$와 3.85 $kg/cm^2$로 나타나 파이타제 첨가에 따른 차이를 보였다(p<0.05). 질소 배설량과 흡수량은 처리구간에 차이가 없었으나(p>0.05), 인 배설량과 흡수량은 파이타제 첨가구에서 대조구에 비해 배설량이 크게 감소하고 흡수량은 증가하였다(p<0.05). 파이타제 첨가에 따른 영양소와 아미노산의 소화율은 조섬유, 조회분, 칼슘과 인, 필수 아미노산 중 lysine, methionine, phenylalanine, 비필수 아미노산 중 alanine, cystine, glutamic acid, glycine, tyrosine의 소화율을 유의적으로 증가시켰다(p<0.05). 이 실험 결과 산란계에 미생물유래 파이타제 급여는 산란율을 향상시키고, 인 배설량을 낮추며, 흡수량을 증가시키지만, 계란 품질에 미치는 영향이 없었고, 소화율에 대한 영향은 추후의 연구가 필요하다고 사료된다.

Keywords

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