산란후기에 뽕잎의 첨가급여가 산란계의 생산성과 계란품질 및 혈액성상에 미치는 영향
Effects of dietary Mulberry Leaf Supplementation on the Performance, Egg Quality and Blood Composition for the Finishing Stage of Laying Hens
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본 연구는 산란후기 사료에 뽕잎의 수준별 첨가 급여가 산란계의 생산성, 계란품질 및 혈액성상에 미치는 영향을 구명하고자 시행하였다. 74주령 하이라인 브라운 산란계 360수를 4개처리 5반복 반복당18수씩 배치하여 12주간 사양실험을 실시하였다. 처리구는 ME 2750kcal/kg, CP 15%인 기초사료에 뽕잎분말을 0, 0.2, 0.4 및 0.8% 수준으로 첨가 급여하였다. 산란율과 난중은 매일, 사료섭취량과 계란품질은 4주 단위로 조사하였고, 혈액성상과 난황지방산은 사양실험종료 후 채취하여 측정하였다. 전체 사양실험기간에서 산란율과 1일 산란량은 뽕잎 첨가구에서 증가하는 경향을 보였지만 처리구간에 통계적차이는 없었고, 난중, 사료섭취량 및 1일산란량도 유의적 차이는 없었다. 사료요구율은 실험 전기간 뽕잎첨가구에서 개선되는 경향이 있었으며, 특히 82~85주령에서는 통계적 차이를 확인하였다(p<0.05). 난백높이, 호유닛, 난각강도 및 두께는 처리구간 차이가 없었다. 불포화지방산은 뽕잎의 첨가수준에 따라 현저하게 증가하였지만(p<0.05), 포화지방산은 감소되었다(p<0.05). 혈청 HDL 콜레스테롤은 0.4%첨가수준에서 현저하게 증가하였고(p<0.05), 중성지방은 뽕잎 급여수준에 따라 매우 감소하는 경향을보였다. 그러므로 본 연구결과는 뽕잎의 첨가급여가 산란후기 산란계의 생산성, 계란품질 및 강건성을개선하는데 효과적인 것을 시사한다.
Abstract
This study was conducted to investigate the effects of feeding Mulberry leaves on theperformance, egg quality and blood composition of laying hens during the finishing stage. Threehundred sixty Hyline Brown laying hens were replaced into four treatments with 5 replicates of18 birds in each from 74 to 85 weeks of age. Basal diets contained ME 2750, CP 16% andadded the 0, 0.2, 0.4 and 0.8% mulberry leaves. Egg production, feed intake, feed conversionand egg quality were measured in every four weeks. Blood and yolk were taken at the end ofthe experiment. Egg production, and daily eggmass fed mulberry leaves tended to increasecompared to that of the control, but was not significantly different. Feed conversion seemed toimprove in mulberry leaf addition treatment. Albumin height, haugh unit, eggshell breaking strength and eggshell thickness were not statistically different among the treatments. Unsaturatedfatty acid content showed significant increase depending on the mulberry leaf addition(p<0.05),but saturated fatty acids decreased. HDL cholesterol of birds fed 0.4% mulberry leaves increasedsignificantly, but the neutral fat decreased as mulberry leaf addition increased. The result of thisstudy show mulberry leaf addition improved the egg production, quality, health of laying hensduring the finishing stage.
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