调质温度对肉鸡颗粒饲料质量影响的实验研究

Experiment research on the effect of conditioning temperature on broiler pellet feed quality

饲料加工过程中的调质温度是影响饲料调质效果的关键因素之一，为获得肉鸡颗粒饲料（后期料）的适宜调质温度，实验在65、70、75、80、85、90℃6个不同温度下研究了调质温度对玉米-杂粕型肉鸡日粮颗粒耐久性（PDI）、硬度、淀粉糊化度、植酸酶活性保留率、蛋白质体外消化率、还原糖含量的影响，以评价调质温度对肉鸡颗粒饲料质量的影响。结果表明， PDI、硬度随调质温度升高极显著升高（P〈0.01），淀粉糊化度在调质温度达到75℃时达到30.32%，与80℃组比较无差异（P〉0.05）；蛋白质体外消化率随调质温度的升高呈现先上升后下降的趋势，最高值在80℃组，且极显著（P〈0.01）高于85℃组，与75℃组比较无差异（P〉0.05），80℃组植酸酶活性保留率极显著（P〈0.01）低于75℃组，85℃组极显著（P〈0.01）低于75℃组，还原糖含量随调质温度的升高极显著（P〈0.01）降低。玉米-杂粕型肉鸡全价颗粒饲料的适宜调质温度为75~80℃。

Conditioning temperature is one of the key factors that influence the quality of the fi-nal feed products in the feed processing. In this research, 65, 70, 75, 80, 85 ℃ and 90 ℃ are selected to study the effect of conditioning temperature on the Pellet Durability Index （PDI）, hardness, gelatinization degree of starch, protein digestion rate in vitro and reducing sugar con-tent of the Corn- miscellaneous meal broiler diets to estimate the effect of conditioning temper-ature on broiler pellet feed quality. The results suggested that with the conditioning temperature increased,PDI and hardness showed significantly increase（P〈0.01）;the gelatinization degree of starch reached 30.32% under 75 ℃, which with no difference compared to 80 ℃（P〉0.05）. Pro-tein digestion rate in vitro showed a upward trend first then downward with the rise of condition-ing temperature, and arrived at the best value when under 80℃,with significant difference com-pared to 85 ℃（P〈0.01） but no difference to 75 ℃（P〉0.05）. when under 80 ℃ the phytase activi-ty retention rate showed significantly lower than which under 75 ℃ （P〈0.01）, 80 ℃showed significantly lower than 85 ℃ （P〈0.01）. The reducing sugar content showed a significant downward trend with the condition-ing temperature increasing（P〈0.01）. It could be concluded that the suitable conditioning temperature for complete pellet feed of broiler （later material） is 75~80℃.