Abstract
This experiment was conducted to investigate the effects of dietary enzyme mixture fortified with ${\beta}-glucanase$ on the growth performance, serum components and meat quality of broiler chicks. 31,800 Ross 208 male broiler chicks were randomly allotted into 2 groups, the control and 0.3% enzyme diet with ${\beta}-glucanase$ supplementation groups. Control group chicks were fed the control (corn-soybean meal based) diet and the treatment group chicks were fed the 0.3% enzyme mixture supplemented with ${\beta}-glucanase$. The growth performance, serum components and meat qualities such as pH, color, water holding capacity, cooking loss, and shearing force of meats were investigated. The results showed that the growth performance of chicks fed the 0.3% enzyme mixture diet were improved compared to that of the control group, as much as 5% in growth rate, 19% in average weight, 6.8% in performance index, and 5.5% in feed efficiency. Although, there were no significant differences in the muscle color degrees ($L^*a^*b^*$) and shearing force between the control group and experimental group, the water holding capacity and cooking loss of the experimental group were significantly higher than those of control group (p<0.05). The antibody titers in serum against the antigens of Newcastle disease and Infectious Bursal disease were higher in the experimental group than in the control group. Altogether, these suggest that the broiler diet containing 0.3% enzyme mixture fortified with ${\beta}-glucanase$ activity can improve the growth performance, immune reaction, and meat quality of broiler chicks.
본 연구에서는 Ross 208 종의 broiler 31,800수를 대조구와 복합 효소제 첨가구로 나누어 5주간에 걸쳐 대조구는 옥수수-대두박을 기초로 한 시판 육계사료를 급여하고, 시험구는 ${\beta}-glucanase$를 강화한 복합 효소제를 0.3% 첨가 급여하여 생산성과 혈청성분과 육질에 미치는 영향을 조사하였다. 시험기간 동안의 각 시험구의 증체량 및 사료 효율, 생산지수, 육성율을 측정하였고 무작위로 각 시험구당 20수를 선발하여 혈청 콜레스테롤 및 glucose 농도를 측정하였다. 또 ND와 IBD 항원을 음용 투여한 브로일러의 ND와 IBD에 대한 항체역가를 조사하였으며, 육질검사로 도체의 pH 및 육색, 가열감량, 보수력, 전단력을 측정하였다. 사육시험 결과, 0.3% 복합 효소제 시험구가 대조구에 비해 평균체중 19%, 생산지수 6.8%, 사료효율 5.5%, 육성율 5%의 증가를 나타내었다. 복합 효소제 시험구는 대조구보다 혈청내 HDL-콜레스테롤 양을 증가시키고 glucose의 양을 감소시켰다. 육계 혈청 내 ND 및 IBD 항원에 대한 항체역가도 복합 효소제 시험구가 대조구보다 높았다. 육질검사에 있어서는 복합 효소제 시험구가 대조구보다 육색과 전단력은 차이가 없었으나 보수력(p<0.05)과 가열감량이 개선되는 결과를 나타내었다. 이상의 결과로부터 ${\beta}-glucanase$ 활성을 강화한 복합 효소제의 첨가 급여는, 육계의 생산성과 혈청성분과 면역기능과 육질을 개선시키는 효과가 있는 것으로 사료된다.
