Abstract
A feeding trial was carried out to evaluate optimum feeding system to Korean Native Chicken (KNC) with various feeding programs for 64 weeks. Eight hundreds and ten KNC＇one day birds were assigned to three feeding systems, NRC(T1), Japanese Feeding Standard(T2), Korean Feeding Standard(T3). Each treatment had three replicates of 90 birds a replicate. Data were obtained growing performance to 20 week of age and laying performance from twenty one to sixty four week. Viability to 20 week of age was similar to treatments. Growth characteristics by feeding systems were not significantly difference on body weight, feed intake and 50％ egg production days. However, body weight was less about 100g in T2. There were no different on egg production, egg weight, and egg mass during laying period. Feed intake of T1 was 104g daily and showed lower than other treatments, but was not different significantly. Feed conversion was significantly improved in T2(P <0.05) compared to other treatments(P<0.05). Egg production of all treatments was the highest between 27 to 30 week of age. ME intake of T1 was significantly maximized, whereas CP intake was the lowest of all treatments(P < 0.05). Nutrient requirements for egg mass tended to depend on nutrients intake. Interior egg and eggshell characteristics were not different among treatments except yolk color. Fertility and hatchability were similar to treatments, and the results at 39 week of age were higher than at 62 week in all treatments. In conclusion, treatments fed three or four phase feeding would be superior to other treatments during the growing period and suggest 2,800 ㎉/kg ME, 15％ CP for Korean native laying hen.
본 연구는 한국재래닭의 적정 사료급여체계에 대한 기초자료를 제시하기 위해, 재래닭 810수를 공시하여 부화후 1일령부터 64주령까지 사양시험을 실시하였다. 시험사료는 NRC(＇94,T1), Japanese Feeding Standard(＇92, T2), 한국표준가축사료급여기준(＇94, T3)에 의거 배합하였으며 사양시험 결과는 다음과 같다. 1. 육성률은 처리간에 차이가 없었으며, 50％ 산란 도달일령 역시 164∼165일로서 비슷하였다. 2. 20주령 체중은 가 T1과 T3에 비하여 낮았으며, 사료섭취량은 반대로 T2가 약간 많이 섭취한 경향이었지만, 처리간 통계적 유의성은 인정되지 않았다. 3. 64주간 평균 산란율은 T2가 가장 높았고 T3가 낮았지만 유의적 차이는 인정되지 않았으며, 산란 최고기는 공히 27∼30주령이었다. 4. 평균난중과 1일 산란량은 각각 49∼50g과 30∼31g으로서 처리간 비슷한 결과를 보였다. 5. 사료섭취량은 T1이 1∼2 정도 적게 섭취하였으나 유의성은 없었고, 사료요구율은 T1이 가장 개선되었으며 T2, T3순으로 나타났다. 6. 대사에너지 섭취량은 T1이 T2와 T3에 비하여 많았으며(P<0.05), 조단백질 섭취량은 반대의 경향을 보였지만 유의성은 없었다. 산란 kg당 영양소 요구량도 동일한 경향이었으나 유의성은 없었다. 7. 난형질은 사료의 영양소 수준에 따른 차이가 없는 것으로 나타났는데, 난황색은 콘글루덴밀의 영향으로 T1이 진하게 나타났다(P<0.05). 8. 수정율과 부화율은 처리간에 차이가 없었으며, 39주령의 성적이 62주령에 비하여 우수하였다. 이상과 같은 결과로 한국재래닭의 합리적인 사료급여체계는 육성기를 3 혹은 4단계로 나누어 사육하고, 산란기 영양소는 대사에너지 2,800kcal/kg, 조단백질 15％수준이 합리적일 것으로 사료된다.
