Abstract
'Ihis experiment was canied out to investigate the feed intake, chewing activities and ruminal characteristics by change in roughage intake and concentrate feeding amount with 15 Holstein cows. 1. DM intake of cow fed rice straw, corn silage and grass hay was 4.97, 5.47 and 5.60% of metabolic weight, respectively, and that by kg increase of concentrate was decreased by 0.330, 0.294 and 0.461 kg, respectively. 2. RVI of rice straw, com silage and grass hay was 98.3, 93.7 and 87.1 respectively, and correlations between RVIfl) and concentrate level@) were the following; $Y_1$(rice straw) = 99.4543 - 5.9759X + 0.0230$X^2$ This experiment was carried out to investigate the feed intake, chewing activities and ruminal characteristics by change in roughage intake and concentrate feeding amount with 15 Holstein cows. 1. DM intake of cow fed rice straw, corn silage and grass hay was 4.97, 5.47 and 5.60% of metabolic weight, respectively, and that by kg increase of concentrate was decreased by 0.330, 0.294 and 0.461 kg, respectively. 2. RVI of rice straw, com silage and grass hay was 98.3, 93.7 and 87.1 respectively, and correlations between RVI(Y) and concentrate level(X) were the following; $Y_1$(rice straw) = 99.4543 - 5.9759X + 0.0230$X^2$ $Y_2$(com silage) = 88.7601 - 2.9000X - 0.2111$X^2$ $Y_3$(grass hay) = 95.1515 - 6.3096X + 0.0873$X^2$ 3. Average ruminal pH in rice straw feeding group was the highest and correlations between ruminal pH(Y) and concentrate level(X) were the following; $Y_1$ = 7.0920 - 0.0309X - 0.0023$X^2$ $Y_2$ = 6.5000 - 0.0516X + 0.0002$X^2$ $Y_3$= 6.7666 - 0.0072X - 0.0044$X^2$ 4. Average ruminal $NH_3-N$ concentration in forage hay feeding group was the highest and correlations between ruminal $NH_3-N$ concentration(Y) and concentrate level(X) were the following. $Y_1$ = 3.3777 - 0.0587X + 0.0682$X^2$ $Y_2$ = 4.2765 + 0.5921X + 0.0181$X^2$ $Y_3$= 5.3634 - 0.4203X + 0.0223$X^2$ 5. Ruminal VFA wncentmtion in corn silage feeding group was the highest.
본 시험은 국내생산 주요 조사료인 볏짚, 옥수수사일레지, 목건초를 급여하면서 농후사료 수준을 조절하였을 때 반추생리 및 저작형태에 미치는 효과를 조사하기 위하여 농후사료 5개수준(0, 3, 6,9 12kg/일)에 젖소 15두를 공시하여 시험을 실시한 결과는 다음과 같다. 1. 건물섭취량은 볏짚, 옥수수사일레지, 목건초가 대사체중비 4.97, 5.47 그래고 5.60%를 섭취하였으며 농후사료 증가에 따른 조사료 건물섭취량 감소량은 볏짚 0.330, 옥수수사일레지 0.294 그리고 목건초는 0.461kg이었다. 2. 조사료의 조사료가 지수는 볏짚, 옥수수사일레지, 목건초가 각각 98.3, 93.7 그리고 87.1이였으며, 조사료가 지수(Y)와 농휴사료 증가수준간(X)에는 다음과 같은 상관이 성립되었다. $Y_1$(rice straw) = 99.4543 - 5.9759X + 0.0230$X^2$ $Y_2$(com silage) = 88.7601 - 2.9000X - 0.2111$X^2$ $Y_3$(grass hay) = 95.1515 - 6.3096X + 0.0873$X^2$ 3. 반추위액의 평균 pH는 볏짚급여시 가장 높았으며 반추위액의 pH(Y)와 농후사료 급여수준(X)과는 다음과 같은 상관이 성립되었다. $Y_1$ = 7.0920 - 0.0309X - 0.0023$X^2$ $Y_2$ = 6.5000 - 0.0516X + 0.0002$X^2$ $Y_3$= 6.7666 - 0.0072X - 0.0044$X^2$ 5. 반추위액의 휘발성 지방산 함량은 옥수수사일레지 급여시 가장 높았다.
