初始水温与饲料液态发酵及液态转固态后pH值变化规律研究

Effect of Beginning Water Temperature on pH Variation of Feed Liquid Fermentation and Fermented Solid Feed

试验研究了初始水温对液态发酵饲料pH值变化规律及将液态发酵饲料转为固态之后0 h和继续发酵24 h后的pH值变化规律。研究发现,初始水温对液态发酵饲料pH值变化规律及液态发酵饲料转为固态之后pH值变化规律分别可以利用方程y=-0.179x+7.584和y=-0.142x+8.587估测,均在初始水温17～20℃之间pH值显著下降,并且呈线性相关,而初始水温在20℃以上时发酵对pH值影响不显著(P>0.05)。液态转固态再发酵24h后各个温度段的pH值变化都不显著(P>0.05)。

The effect of beginning water temperature on pH variation of feed liquid fermentation and 0 h and 24 h solid fermented feed was studied.The result showed that when the beginning temperature was 17～20 ℃,the pH value decreased obviously and matched linear model.The variation of pH of liquid fermentation feed and solid fermented feed according to beginning water temperature could be estimated by function y=-0.179x＋7.584 and y=-0.142x＋8.587,respectively.When the beginning temperature was above 20 ℃,its effect on pH was not significant（P0.05）.The pH variation of 24h solid fermented feed at different temperature range wasn＇t significant（P0.05）.