고온 환경에서 사료내 트립토판과 나이아신의 단독 혹은 혼합 첨가가 산란계의 생산성, 난품질, 지방간 지표 및 혈액성상에 미치는 영향
Effect of Individual or Combination of Dietary Tryptophan and Niacin Supplementation on Productive Performance, Egg Quality, Fatty Liver Incidence, and Serum Measurement of Laying Hens Raised under Heat Stress Conditions
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초록
본 연구는 고온 환경에서 사료내 트립토판과 나이아신의 첨가가 산란계의 생산성, 난품질, 지방간 지표 및 혈액성상에 미치는 상호작용 효과를조사하고자 수행되었다. 총 384수의 25주령 로만 갈색종 산란계를 4처리 8반복으로 반복당 12수씩 무작위 임의 배치하였다. 기본 사료는 트립토판과나이아신의 추가적인 첨가는 없으며 모든 영양소 및 에너지는 로만갈색종 산란계의 요구량에 충족하거나 초과하도록 배합되었다. 사료 처리구는2 × 2 요인 실험 설계법으로 두 가지 수준의 트립토판(0 및 0.16%)과 두 가지 수준의 나이아신(0 및 0.03%)이 포함되었다. 모든 산란계의 사양환경은일반 농가에서 낮시간에 온도가 올라가는 점을 고려하여 일일 중 8시간은 온도 31.4 ± 1.17℃, 습도 86.0 ± 4.28%으로 설정하였으며, 나머지16시간은 온도 26.7 ± 1.10℃, 습도 61.7 ± 6.34%로 유지하여 주기적인 고온 환경을 조성하였다. 실험은 10주간 진행되었다. 실험 결과 사료내트립토판과 나이아신의 주요 효과와 상호작용은 나타나지 않았다. 이와 유사하게, 난각 강도, 난각 두께, 난각색, 난황색 및 호우유닛에 대한 상호작용도 나타나지 않았다. 주요 효과로 0.03%의 나이아신 첨가는 난황색을 유의적으로 감소시켰으나 호우유닛은 유의적으로 증가시켰다. 하지만, 0.16%의트립토판 첨가는 난품질에 영향을 끼치지 않았다. 지방간 지표와 혈액성상에서 사료내 트립토판과 나이아신의 주요 효과 및 상호작용은 나타나지않았다. 결론적으로, 본 연구에서 설정한 농도의 사료내 트립토판과 나이아신의 첨가는 고온 환경에서 사양되는 산란계의 생산성, 난품질, 지방간지표 및 혈액성상에 긍정적인 영향을 미치지 않았다.
Abstract
This experiment investigated the interactive effect of dietary tryptophan (Trp) and niacin supplementation on productive performance,egg quality, fatty liver incidence, and serum measurements of laying hens raised under heat-stress conditions. 384 25-week-old LohmannBrown-Lite laying hens were randomly allotted to 1 of 4 dietary treatments with 8 replicates. Each replicate had 12 birds. The basaldiet with no supplementation of Trp and niacin was formulated to meet or exceed the nutrient and energy requirement. Dietary treatments included 2 levels of supplemental Trp (0 and 0.16%) and 2 levels of supplemental niacin (0 and 0.03%) in a 2 × 2 factorial arrangement. All hens were raised under a cyclic heat stress condition at 31.4 ± 1.17℃, 86.0 ± 4.28% for 8 h/d and 26.7 ± 1.10℃, 61.7 ± 6.34%for the remaining time. The experiment lasted for 10 wk. Results indicated no main effects and interactions of dietary Trp and niacinwere observed for productive performance. Likewise, no interactions were found for eggshell strength, eggshell thickness, eggshell color,egg yolk color, and haugh unit. As the main effects, dietary supplementation of 0.03% niacin decreased (P < 0.05) egg yolk colorbut increased (P < 0.05) haugh unit. However, dietary supplementation of 0.16% Trp did not affect egg quality. No main effects andinteractions of dietary Trp and niacin were observed for fatty liver incidence and serum measurements. In conclusion, dietarysupplementation of Trp and niacin at the current level may exert no positive effects on productive performance, egg quality, fatty liverincidence, and serum measurements of laying hens raised under heat-stress conditions.
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