Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effects of Dietary Energy and Protein Levels on Growth of Egg Breeder Pullets

산란종계 육성기 사료의 에너지 및 단백질 수준이 성장에 미치는 영향

  • 노성래 (건국대학교 축산대학 동물자원연구센터) ;
  • 유선종 (건국대학교 축산대학 동물자원연구센) ;
  • 김성권 (건국대학교 축산대학 동물자원연구센) ;
  • 김은집 (건국대학교 축산대학 동물자원연구센) ;
  • 안병기 (건국대학교 축산대학 동물자원연구센) ;
  • 강창원 (건국대학교 축산대학 동물자원연구센터)
  • Published : 2003.06.01
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Abstract

This experiment was conducted to investigate the effects of dietary energy and protein levels on the growth rate of egg breeder pullets. A total of 360 Hy-Line Brown pullets aged 2 to 6 weeks (Phase I) were fed 5 rations differing in dietary protein (17, 19 and 20%) and energy (2,800, 2,950 and 3,050 kcal/kg, TMEn) leveIs for a period of 5 weeks and those aged 6 to 10 weeks (Phase II) were fed 5 rations differing in dietary protein (15, 16 and 17%) and energy (2,800, 2,900 and 3,000 kcal/kg, TMEn) levels in order to evaluate the optimum dietary energy and protein leveIs for egg breeder pullets reared in cages. Their body weight gains were significantly influenced by the dietary protein levels (P<0.05). The dietary energy levels did not greatly affect the growth performances throughout the experimental period. The low energy and protein regimen based on NRC requirement (control) was found to produce smaller pullets and lower tibia bone measurements as compared to the higher regimen groups. With the increase in dietary energy and protein levels, tibial bone strength and ash content also gradually increased (P<0.05). There were no significant differences in the flock uniformity among the treatments. These results indicate that increases in dietary energy and protein levels above the NRC requirements appeared to be more effective in obtaining the optimal growth and bone developments of egg breeder pullets reared in cage.

본 연구는 산란종계 육성 사료 내의 에너지 및 단백질 수준이 육성기 성장에 미치는 영향을 규명하고자 실시하였다 .8일령의 Hy-Line Variety Brown 갈색 산란종계 암평아리 360수를 5개 처리에 처리당 4반복, 반복당 18수씩 완전 임의 배치하여 에너지와 단백질 수준이 다른 실험 사료를 9주간 급여하였다 .실험 기간 중 2주 간격으로 사료섭취량과 공시계의 생체중, 정강이 길이를 개체별로 측정하였고, 성장 균일도를 조사하였다. 실험 종료 시에 반복별로 평균체중에 해당하는 개체를 2수씩 희생시킨 후 우측 경골을 적출하여 경골 중량, 길이, 파쇄 강도 및 경골 내 회분 함량 등을 조사하였다 .실험종료 시, 증체량과 정강이 길이에서는 대조구에 비해 단백질 함량을 증가시킨 처리구에서 유의하게 증가하는 (P<0.05) 결과가 관찰되었다 사료섭취량에서는 처리간에 큰 차이가 없는 것으로 나타났다. 경골 길이 및 중량은 성장 성적의 증가와 상응해 증가하는 결과가 관찰되었고, 경골 강도 및 경골 내 회분 함량 역시 에너지 및 단백칠 수준의 증가에 따라 증가하는 결과 (P<0.05) 가 나타났다. 성장 균일도는 에너지 및 단백질 수준이 높은 처리구에서 실험 종료시인 10주째 증가하는 경향이 관찰되었으나, 처리간에 통계적 유의성 있는 차이는 인정되지 않았다. 본 연구에서 국내의 산란종계 병아리의 육성에서 NRC(1994) 사양표준의 권장 수준보다 대사에너지와 단백질 수준을 높인 육성 사료 또는 종계회사의 권장 수준에 가까운 에너지 및 단백질 수준의 육성 사료가 산란종계 병아리의 성장에 가장 적합한 영양 수준인 것으로 나타났다. 즉 Phase I 은 에너지 2800 ∼ 2950 kcal/kg, 단백질 19% 정도인 T3 구가 육성초기 가장 적합한 영양수준이고, Phase II에서도 T3, 즉 에너지 2800 ∼ 2950 kcal/kg, 단백질 16%수준이 가장 육성중기 병아리 발달에 가장 적합한 영양수준인 것으로 사료된다.

Keywords

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