Effect of Dietary Alfalfa Meal on Egg Yolk Cholesterol Content and Productivity in Laying Hens

산란계 사료에 대한 Alfalfa Meal의 첨가가 난황 콜레스테롤 및 생산성에 미치는 영향

This study was conducted to estimate the effect of dietary alfalfa meal on the contents of egg yolk cholesterol, the levels of egg yolk pigmentation and the performance of laying hens. Alfalfa meal which was alternated wheat bran was supplied 0, 3.5 and 7%, respectively. Total 192 brown laying pullets of 47 weeks old were randomly assigned to the wire cages from July 23 to October 7, 1991 for 10 weeks. The results obtained were summarized as follows ： 1. The egg production was highest at 3.5% alfalfa meal level during the entire period. But there was no significant difference among treatments. 2. Egg weight increased in treatments 3.5 and 7% alfalfa meal supplementation significantly. (P<0.01). 3. Even though there was no significant difference, the daily egg mass was the highest at 3.5% of alfalfa meal level. 4. Daily feed intake was the highest at 3.5% of alfalfa meal level. However, feed conversion rate was the lowest among treatments. 5. The feed cost per kg egg mass in the treatment of 3.5% alfalfa meal was significantly lower than the other treatments. (P<0.05). 6. Shell thickness and shell weight in terms of egg shell quality were increased as the levels of alfalfa meal were increased. But there was no significant difference among treatments. 7, The egg yolk Pigmentation was improved significantly as the level of alfalfa meal was increased (P<0.01). 8.899 yolk cholesterol contents were decreased in the treatments of 3.5 and 7% alfalfa meal supplementation compared with those in the treatment of wheat bran only(P >0.05). The results of this study indicate that 3.5% alfalfa meal level was most effective and economical in laying hen.

본 연구는 alfalfa meal의 첨가가 산란계의 생산성, 난황 착색도, 난황 cholesterol 함량 등에 미치는 영향을 규명하기 위하여 실시하였다. alfalfa meal을 밀기울와 대체하여 0, 3.5, 7% 첨가하는 3개 처리에 총192수의 갈색 산란계를 공식하였고, 공시계는 완전임의 배치하여 철제 cage에서 사육하였으며 1991년 7월23일부터 10월 7일까지 10주간에 걸쳐 시험을 진행하였다. 본 시험의 결과를 요약하면 다음과 같다. 1. 전 기간을 통해 산란율은 alfalfa meal 3.5% 첨가구에서 가장 높았으나 통계적인 유의차는 없었다. 2. 난중은 alfalfa meal 3.5, 7% 첨가구가 대조구에 비하여 유의하게 증가하였다(P<0.01). 3. 통계적인 유의차는 인정되지 않았으나 일산란양은 alfalfa meal 3.5% 첨가구에서 가장 높았다. 4. 1일 사료 섭취양은 alfalfa meal 3.5% 첨가시 가장 많았으나 사료 요구율은 가장 낮았다. 5. 산란 kg당 사료비는 alfalfa meal 3.5% 첨가구가 유의하게 타구에 비해 낮았다(P<0.05). 6. 난질 및 난각질에 있어서 난각후도와 난각중은 alfalfa meal의 첨가 수준이 증가함에 따라 증가하였으나 통계적인 유의차는 인정되지 않았다. 7. 난황 착색도는 alfalfa meal의 첨가량이 증가할 때 유의적으로 증가하였다(P<0.01). 8. 통계적인 유의차는 없었으나 난황 cholesterol 함양은 밀기울만을 급여한 구와 비교해서 alfalfa meal을 3.5%, 7% 급여한 구에서 감소하는 경향을 보였다.