Effect of Enzyme and Yeast Extract Supplement on Growth Performances, in vitro Ruminal Fermentation and Blood Parameters in Hanwoo Steers
본 시험은 효소제 및 효모추출물 급여가 사양성적, in vitro 반추위 발효 및 혈액성상에 미치는 영향을 구명하기 위해 23개월령의 한우 거세우 48두를 공시하여 사료용 첨가제로 농후사료의 0.1% 수준으로 급여하여 출하시까지 대조구(무첨가), 처리구 1(효소제), 처리구 2(효모추출물), 처리구 3(효소제+효모추출물)으로 구분하여 급여하였다. 사양성적에서는 급여 4개월과 8개월의 일당증체량과 사료요구율이 처리구 1에서 가장 향상되었고 (p<0.05), 대조구에서 가장 낮았다(p<0.05). 도축성적에서는 육량지수를 포함하여 처리구 1>처리구 3>처리구 2>대조구 순으로 나타났다. in vitro 배양액에 따른 처리구별 pH는 대조구>처리구 2>처리구 3>처리구 1 순으로 유의적(p<0.05)인 차이를 나타냈고, VFA와 사료소화율은 처리구 1과 3에서 높았고 (p<0.05), 대조구에서는 낮았다(p<0.05). 혈액성상에서는 면역 첨가제 급여군인 처리구 2와 3에서 급여기간에 따른 백혈구 수치가 유의적(p<0.05)으로 감소하였는데, 이는 면역글로블린 G의 유의적(p<0.05)인증가에 따라서 상대적으로 나타난 것으로 판단된다. 결과적으로, 한우 비육후기 거세우의 사료첨가제 급여 시험에서 처리구 1은 급여 4개월부터 대조구 대비 사양성적 및 도체성적을 향상시켰고, 처리구 2는 급여 2개월부터 면역에 관련된 면역글로블린 G의 혈액성상을 개선시키는 것으로 분석되었다.
This study was conducted to investigate the effect of enzyme and yeast extract supplement on growth performance, in vitro ruminal fermentation and blood parameters in Hanwoo steers. A total of forty-eight 23-month-old Hanwoo steers, with average initial body weight of 545.25 ± 12.60 kg, were assigned to four treatments with three replicates in a completely randomized design. Hanwoo steers housed in four heads group per pen. The treatments comprised of four groups of control (no feed additives), treatment 1 (xylanase, cellulase, and gluco-amylase; 0.1% / concentrate), treatment 2 (β-glucan and mannan-oligosaccharide; 0.1% / concentrate), and treatment 3 (treatment 1 + 2; 0.1% / concentrate). During the fourth and eighth month, average daily gain and feed conversion rates improved in treatment 1, but in the control this was lower than the other treatments (p<0.05). Carcass traits (longissimus muscle area, back fat thickness, and marbling score) and the better results were in the following order: treatment 1 > treatment 3 > treatment 2 > control. in vitro ruminal fermentation characteristics, according to the pH by treatment, had statistically significant differences (p<0.05) in the following order: control > treatment 2 > treatment 3 > treatment 1. Volatile fatty acids and feed digestibility were highest in treatment 1 but lowest in control (p<0.05). White blood cell indices were lower in treatments 2 and 3 and the IgG indices were relatively higher than in other treatments. As a result, levels of xylanase, cellulase, and gluco-amylase were increased from the fourth month to improve growth performance, in vitro ruminal fermentation and carcass grade. During the second month, β-glucan and mannan-oligosaccharide increased IgG indices in blood parameters.