CAJ | 학술논문

[目的]研究不同热应激条件下添加二氢吡啶对奶牛瘤胃发酵功能的影响。[方法]试验选取6头三胎次泌乳中期中国荷斯坦奶牛,采用自身前后对照,分为4个时期：无应激且不添加二氢吡啶（NS-ND）、无应激添加二氢吡啶（NS-D）、应激但不添加二氢吡啶（S-ND）、应激且添加二氢吡啶（S-D）,二氢吡啶添加量为每头牛3.0g/d（即0.6mg/kg体重）。[结果]S-ND时期与NS-ND时期相比,瘤胃液中pH值降低,NH3-N浓度极显著升高（P〈0.01）,瘤胃液内挥发性脂肪酸（VFA）的浓度显著下降（P〈0.01）,其中乙酸的百分比含量下降,丙酸和丁酸的百分比含量升高,但差异不显著（P〉0.05）,乙丙比呈稍下降趋势,差异不显著（P=0.13）;应激和无应激时期添加二氢吡啶后,有使瘤胃液pH降低的趋势,NH3-N浓度均显著降低（P〈0.01）,VFA的浓度显著提高（P〈0.01）,乙丙比显著增高（P〈0.01）。[结论]添加二氢吡啶对提高热应激时期奶牛瘤胃的发酵功能有良好效果。
[목적]연구불동열응격조건하첨가이경필정대내우류위발효공능적영향。[방법]시험선취6두삼태차비유중기중국하사탄내우,채용자신전후대조,분위4개시기：무응격차불첨가이경필정（NS-ND）、무응격첨가이경필정（NS-D）、응격단불첨가이경필정（S-ND）、응격차첨가이경필정（S-D）,이경필정첨가량위매두우3.0g/d（즉0.6mg/kg체중）。[결과]S-ND시기여NS-ND시기상비,류위액중pH치강저,NH3-N농도겁현저승고（P〈0.01）,류위액내휘발성지방산（VFA）적농도현저하강（P〈0.01）,기중을산적백분비함량하강,병산화정산적백분비함량승고,단차이불현저（P〉0.05）,을병비정초하강추세,차이불현저（P=0.13）;응격화무응격시기첨가이경필정후,유사류위액pH강저적추세,NH3-N농도균현저강저（P〈0.01）,VFA적농도현저제고（P〈0.01）,을병비현저증고（P〈0.01）。[결론]첨가이경필정대제고열응격시기내우류위적발효공능유량호효과。
[Objective]This paper was conducted to investigate the effect of dihydropyridine （DHP） on rumen fermentation in different heat stress levels. [Method]Six dairy cows in mid lactation were used. There were four periods in this research： unstressed without DHP （NS-ND）, unstressed with DHP （NS- D）, stressed without DHP （S-ND） ,stressed with DHP （S-D）. Cows were fed with DHP for 3.0 g/d per cow. [Result]The result showed that there was a decrease tendency of ruminal pH values with the increase of the environmental THI, NH3-N concentration increased significantly （ P 〈0.01）, concentration of total VFA in the rumen reduced （ P 〈0. 01）, the proportion of acetic acid among other VFA also reduced throughout the stress shifts （P 〉0.05）, while propionic and butyric acids, demonstrated an opposite tendency （ P ）0.05）. Accordingly, the ratio of acetic acid to propionic acid decreased with the stress in creasing （P=0.13）. In NS-D and S-D period （ P d0.05）,ruminal pH values reduced,NH3-N concentra tion reduced （ P d0.01） ,concentration of total VFA in the rumen increased （ P 〈0.01） and the ratio of acetic acid to propionic acid tended to increase due to DHP addition （ P 〈0.01） compared with NS-ND and S-ND period. [ConclusionlDHP can improve rumen fermentation pattern in heat stress period and its effect is beneficial.