The Effects of Different Methionine and Lysine Levels in. 15％ Iso-protein Diet on the Performance of Laying Hens

동일한 단백질 수준의 사료에서 Methionine과 Lysine수준이 산란계의 생산성에 미치는 영향

The purpose of this study was to investigate the effects of dietary methionine and lysine levels on laying hen performance. The level of protein was fixed 15% during whole experiment period, but the levels of methionine and lysine were 0.30% and 0.58% (Low), 0.32% and 0.64% (Medium), 0.35% and 0 70% (High), respectively. Total 288 laying pullets of 22 weeks age were reared from January 28, 1989 to March 23, 1990 for 60weeks. The results obtained were summarized as follows : 1. The e99 Productions were highest in medium treatment in phase I (22~42weeks of age), phase II (42~62 weeks of age) and phase III (62~82weeks of age) and especially, there was significant difference among treatments during phase II (P＜0.05). 2. Egg weight was significantly increased as the levels of methionine and lysine were increased up to methionine and lysine were 0.32% and 0.64%, respectively(P＜0.01). 3. Daily egg mass was highest when the levels of methionine and lysine were 0.32% and 0.64%, respectively and there were significant differences among treatments during phase I and phase II (P＜0.01) 4. Daily feed intake was increased as the levels of methionine and lysine were increased, and there was significant difference among treatments during phase III (P＜0.05). 5. Feed efficiency was best in medium treatment in phase I and phase II (P＜0.01) 6, Viability was highest in medium treatment, but there was no significant difference among treatments. 7. Nutrient utilizability of experimental diets was not significantly different among treatments. 8. Eviscerated yield was highest and abdominal fat accumulation was lowest in medium treatment, but there was no significant difference among treatments. 9. Egg shell quality and chemical composition of egg content were not different among treatments. 10. The feed cost per kg egg mass was lowest in medium treatment and there were significant differences among treatments in phase I, phase II and whole egg laying period(P＜0.05)

사료의 methionine과 lysine수준이 산란계의 산란기별 생산성에 미치는 영향을 구명하기 위하여 단백질 수준을 15％로 동일하게 하였을 때 methionine과 lysine수준을 달리하는 3개 처리(methionine 0.30％, 0.32％ 및 0.35％ : lysine 0.58％, 0.64％ 및 0.70％)에 22주령의 갈색산란계 28수 공시하여 1989년 1월 28일부터 1990년 3월 23일까지 60주간에 걸친 사양시험과 대사시험 결과를 요약하면 다음과 같다. 1. 산란율은 methionine 0.32％, lysine 0.64 ％ 수준에서 가장 높았으며, 특히 산란중기에서는 methionine 0.30％, lysine 0.58％ 수준에서 산란율이 유의적으로 감소하였다(P＜0.05). 2. 난중은 methionine 및 lysine수준이 증가할수록 점차 증가하는 경향이었으나 methionine 0.32％, lysine 0.64％수준보다 높였을 경우에는 차이가 없었고, 이 수준보다 낮추었을 경우에는 난중이 현저하게 감소하였다 (P＜0.01). 3. 1일 1수당 산란양은 methionine 0.32％, lysine0.64％수준보다 높였을 경우에는 차이가 없었으나 낮추었을 경우에는 현저하게 감소하였으며, 산란초기와 산란중기에는 처리간에 고도의 유의성이 인정되었다(P＜0.01). 4. 사료섭취양은 methionine 및 lysine수준이 증가할수록 점차 증가하는 경향이었으며, 산란말기에는 처리간에 통계적인 유의성이 인정되었다(P＜0.05). 5. 사요요구율은 methionine 0.32％, lysine 0.64％수준에서 가장 우수하여 산란초기와 산란중기에서는 처리간에 고도의 유의차가 인정되었다(P＜0.01). 6. 성계생존율은 methionine 0.32％,lysine 0.64％ 수준에서 가장 높았으나 처리간에 통계적인 유의성은 인정되지 않았다. 7. 시험사료의 영양소 이용률은 처리간에 일정한 경향이나 유의적인 차이를 보이지 않았다. 8. Methionine 0 32％, lysine 0.64％ 수준에서 도체율은 높고 복강지방 축적율은 낮은 경향이었다. 9. 난각질은 처리간에 유의적인 차이를 보이지 않았다. 10. 계란의 일반성분과 아미노산 조성은 사료의 methionine과 lysine수준에 의해 영향을 받지 않았다. 11. 산란 ㎏당 사료비는 methionine 0.32％, lysine 0.64％수준에서 가장 절감되었으며, 처리간에 통계적인 유의성이 인정되었다(P＜0.05)