Abstract
The effect of drinking rhus tree-extract on performance of broiler was performed to investigate development of natural antibiotic in process of broilers production. A total of 320 broiler chicks at 1 day of age were fed the commercial diet and water, drinking water containing 0 ppm(control), 500 ppm (T1), 1,000 ppm (T2) and 2,000 ppm (T3) of rhus tree-extract fur seven weeks. The body weight gain and fred conversion ratio were not different by drinking rhus tree-extract until 35 days of age, but body weight gain and feed conversion ratio were tend to improve by drinking rhus tree-extract over 35 days of age, the improvement was higher in both T$_1$, and T$_3$ than control group(p＜0.05) when 35 to 42 days of age. There was a decrease in the microflora population of both E. coli. end Salmonella in the cecum contents and feaces in broilers by drinking rhus tree-extract. The digestibility of dry matter, crude fat, and crude ash of feed were tend to increased in broiler drinking rhus tree-extract. Digestibility of crude protein of feed in broiler three treated groups was significantly improved (p＜0.15) as compared with those in control group. These results indicated that the drinking rhus tree-extract were effective in the body weight gain, feed conversion ratio, decreasing of microflora population of both E. coli and Salmonella in the cecum contents and feaces, and it had also effective the digestibility of nutrients in broilers.
본 연구는 육계 생산과정에서의 천연항생제 개발을 위해서 옻나무 추출액의 급여가 육계의 생산성에 미치는 영향에 대해서 조사하였다. 총320수의 1일령 육계에 옻나무 추출액 0 ppm (대조구), 500 ppm (T1), 1,000 ppm (T2) 및 2,000 ppm (T3)을 음용수와 함께 7주간 급여하였다. 증체중과 사료요구율은 35일령 까지 차이는 인정되지 않았지만, 그 이후는 옻나무추출액의 급여구가 개선되어지는 경향이 인정되었고 그 개선정도는 T3구에서 더 크게 나타났다. 맹장 내용물 및 분중의 대장균과 살모넬라균은 옻나무 추출액의 급이에 의해서 감소되었다. 사료중 건물, 조지방 및 조회분 소화율은 옻나무 추출액 급이에 의해서 개선되어지는 경향이 인정되었으며, 사료중 조단백질 소화율은 3개의 처리구 공히 대조구에 비해서 유의하게 개선되었다 (P＜0.05). 이상의 결과를 종합해 보면, 증체량, 사료요구율, 맹장내용물과 분중의 대장균과 살모넬라균총의 감소 및 영양소 소화율은 옻나무 추출액의 음수투여가 효과적인 것으로 사료된다.
