Effects of Dietary Energy Levels and Protein Feeding Systems on the Performance of Laying Hens

산란계사료의 에너지수준 및 단백질공급체계에 관한 연구

An experiment was carried out to investigate the effects of dietary energy levels and protein feeding systems on the performance of laying hens. Total 960 White Leghorn pullets were alloted in 10 treatments consisted of 1 metabolizable energy levels (2,900 and 2,600 kcal/kg) and 5 protein feeding systems (17-17-15%, 17-15-13%, 15-15-15%15-15-13% and 15-13-13% in phase I, II and/or III, respectively) from 20 to 80 weeks or age. As metabolizable energy level increased from 2,600 to 2.900 kcal/kg of diet, e99 Productions in phase I and II were not different but decreased in phase III. Egg weight was not different, but daily feed intake and viability were decreased in phase I, II and III. Feed conversions in phase I and II were improved but in phase III it was not different. On the other hand, as dietary Protein level increased from 13 to 17%, egg production and egg weight were increased, and feed conversion was improved , but daily feed intake and viability were not affected by the dietary protein level. For the laying period of 60 weeks, metabolizable energy level of 2,600 kcal/kg of diet and 17, 15 and 13% dietary protein levels in phase I, II and III, respectively, were considered to be adequate to support the optimum productivity.

본시험은 산란계사료의 에너지수준이 산란계의 생산성에 미치는 영향을 구명하기 위하며 대사에너지 수준(2,900, 2,600kcal/kg)과 산란초기, 중기 및 말기의 단백질공결체계(17-17-15%, 17-15-13%, 15-15-15%, 15-15-13 %, 15-13-13%)를 달리하는 10개 처리에 백색 레그흔종 산란계 960수를 공시하며 1987년 6월 50일부터 1988년 8월 22일까지 60주간에 걸쳐 시험을 실시하였던 바 그 결과를 요약하면 다음과 같다. 1. 대사에너지수준이 증가함에 따라 산란초기 및 중기의 산란율은 차이가 없었으나 산란말기의 산란율은 감소하였고 난중은 차이가 없었으며, 사료섭취양은 감소하였고, 사료요구율은 초기와 중기에는 개선되었으나 말기에는 차이가 없었으며 산란kg당 사료비는 초기와 중기에는 차이가 없었으나 말기에는 증가하였고. 성계생존율은 감소하는 경향이었다. 2. 단백질수준이 증가함에 따라 산란율과 난중이 증가하였으며, 사료섭취양에는 차이가 없었고, 사료요구율은 개선되었으며 산란kg당 사료비는 증가하였으나 성계생존율은 차이가 없었다. 3. 산란전기간의 생산성을 고러해 볼 때 대기에너지수준은 2,600kcal/kg, 단백질수준은 초기, 중기 및 말기에 각각 17, 15 및 13%가 적당하였다.