【摘要】 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℃。更多还原

【Abstract】 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 ℃.更多还原