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SCIE SCOPUS
감귤부산물의 사료화에 관한 연구 4 . 산란계에 대한 건조감귤부산물의 사료가치에 관한 연구
Studies on the Utilization of Citrus Byproducts as Livestock Feeds 4 . Feeding value of dried citrus byproducts fed to layers
양승주 , 정창조 ( Seung Ju Yang , Chang Cho Choung )
UCI I410-ECN-0102-2008-520-002139061
* This article is free of use.

As a follow up to recent local broiler experiment further studies were carried out using dried citrus peel and pulp at different substitution levels in layer`s rations. 150 nineteen-weeks-old Warren hayers were used in the present experiment over a period of twentyweeks. The experimental design used included five treatments; T0 (control), T1 (5% dried citrus peel substitution for wheat bran). T2 (10% Ditto), T3 (10% dried citrus peel substitution for wheat bran and 5% for corn), T4 (5% dried citrus pulp substitution for wheat bran). Egg production rate (78.9%-82.5%) decreased significantly in T3 but no statistically significant differences were found between other treatments. Egg weights (59.6g-62.1g) decreased according to substitution level. Daily feed intake (127.0g-129.8g) decreased significantly in T3 and was higher in T2. There were no differences in palatability up to the 10% substitution level. Feed efficiency (2.5-2.7) also showed a similar tendency. There were no significant differences in daily weight gains between treatments but a slightly higher weight gain was observed in treatment 3 and 4. Yolk colour intensity increased and percentage of cracked and soft eggs dropped when substitution levels rose. The proportion of yolk weight, however, decreased. Crude protein utilization decreased according to the increasement of substitution (especially in T3) but there were no differences in NFE utilization between treatments. It is suggested, based on these results, that the substitution of dried citrus waste improves egg yolk colour but results in a decrease in egg weight. It would appear that 10% is the optimum substitution level of dried citrus waste in layers rations.

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