Studies on Factors to Increase Mold Inhibitor Effectiveness in Livestock Rations II. Effects of the Usage of a Mold Inhibitor in the Ration on the Nutritional Status and Performance of Chicks

배합사료에 대한 항곰팡이제의 효과적인 처리 방법과 사료내 영양소 보전 방법 II. 항곰팡이제의 이용이 사료 영양소 보전 및 병아리 성장에 미치는 요인

The effect of mold inhibitor was determined in the commercial rations which had two different protein levels(18% and 12% ) and two different particle sizes(80% of the particles in the ration less than 1.19mm and 40% of the particles in the ration less than 1.1mm). After 40 days storage of the rations treated and not treated with the mold inhibitor the nutritional change of the experimental diets with 18% and 12% protein levels, the growth performance of chicks, and the weight of internal organs fed the 18% protein diet were observed as the criteria of this research The fat level and carotene content in the two diets with 18% and 12% protein level each were significantly (P＜0.05) decreased when the diets were not treated by the mold inhibitor. Even if mold inhibitor was mixed in the diet, the fat content in the diet which had 40% of the particles in the ration less than 1.19mm tended to be decreased, especially, in the diet with a 12% protein level. The carotene content in the diet treated with mold inhibitor which had 40% of the particles in the ration less than 1.19mm also tended to be decreased in both diets (18% protein and 12% protein). Feed types$\times$particle size interaction was significant for the fat content (P＜0.05) and for the carotene content (P＜0.05). The amount of crude protein and ADF was not significantly (P＞0.05) changed after 40 days storage. There was a significant decrease (P＜0.05) in total body weight gain and total feed intake observed in chicks fed the untreated diet with 40% of the particles in the ration less than 1.19mm. Feed conversion was significantly (P＜0.05) depressed in the chicks fed the untreated diet of both particle sizes. Particle size$\times$types of feed interaction in feed conversion was significant (P＜0.05). Relative sizes of the liver, pancreas and spleen were not affected significantly (P＞0.05) by the treatments.

단백질 수준이 18%인 초생추 사료와 12%인 비육우 후반기 사료를 입자도의 크기에 따라 전 사료의 80%가 1.19mm 이하인 것과 전 사료의 40%가 1.19mm 이하인 것으로 나누어서 40일간 저장후 각 처리구의 영양소 변화를 비교하였다. 영양소 변화를 비교한 후 초생추 사료만을 이용하여 입자의 크기를 다르게 하여 항곰팡이제를 처리한 사료와 처리하지 않은 사료에 대한 병아리의 성장 및 사료이용 정도 그리고 장기의 발달을 비교하였다. 항곰팡이가 처리되지 않은 사료에서는 2개의 다른 단백질 수준에서 공히 지방과 카로틴 함량은 현저히(P＜0.05) 감소를 초래하였다. 항곰팡이제가 처리된 사료에서도 입자 크기가 1.1mm 보다 작은 것이 전체 사료의 40% 이하인 구에서는 지방과 카로틴의 함량이 40일간의 저장 후 에는 감소하는 추세를 보였다. 또 입자가 큰 사료에서 항곰팡이제를 처리하지 않았을 때는 신선한 사료나 항곰팡이제를 처리한 구에 비교하여 병아리의 성장이나 사료 섭취량은 현저히 감소(P＜0.05)를 나타냈다. 사료효율 역시 항곰팡이제를 처리하지 않은 구에서 현저히 맞았다. (P＜0.05), 그러나 각 장기의 무게에는 처리간에 차이를 나타내지 못하였다.