不同孔径筛片粉碎团头鲂饲料对其加工性状、鱼体生长和消化酶活性的影响

Effects of Different Mill Screen Mesh Sizes on Feed Processing Characteristics,Growth and Digestive Enzyme Activity of Blunt Snout Bream(Megalobrama amblycephala)

将团头鲂饲料原料用锤片式粉碎机在3种不同孔径(0.8、1.0、1.2 mm)的筛片下进行粉碎然后制成颗粒料,并选用450尾团头鲂随机分为3组,每组5个重复,分别饲喂上述3种饲料,研究不同孔径筛片粉碎团头鲂饲料对其加工性状、鱼体生长和消化酶活性的影响。结果表明,筛片孔径与粉碎机产量呈正相关,与单位产量电耗呈负相关,1.2 mm孔径组的饲料硬度显著或极显著低于另两组,0.8 mm孔径组饲料溶失率显著低于1.0 mm孔径组(P<0.05),0.8 mm孔径组饲料淀粉糊化度极显著高于另两组(P<0.01);1.0 mm孔径组的团头鲂增重和增重率均高于另两组,但差异不显著(P>0.05),其特定生长率显著高于0.8 mm孔径组(P<0.05),0.8 mm孔径组的肥满度显著高于1.2 mm孔径组(P<0.05);各组肝体比、肠道相对长度和消化酶活性无显著差异。综合比较,团头鲂饲料采用1.0 mm孔径的筛片粉碎较好。

To determine the effects of different hammer mill screen sizes on feed processing characteristics, growth and digestive enzyme activity of blunt snout bream （Megalobrama amblycephala）, 450 breams were randomly allocated to 3 treatments with 5 replicates and fed with the diets ground through three screen mesh sizes （0.8,1.0 and 1.2 mm） respectively before pelleting. Results showed that：Screen mesh size was positively correlated with mill production,and negatively correlated with electricity consumption. The hardness of the diets through 1.2 mm mesh size was the lowest or much lower than the other two groups. The diet through 0.8 mm mesh size had a higher leaching rate than that through 1.0 mm mesh size and its starch gelatinization was much higher than that of the other two groups. The breams fed with the diet through 1.0 mm mesh size had numerically the highest weight gain and growth rate, and its specific growth rate was higher than those fed with the diet through 0. 8 mm mesh size. The diet through 0.8 mm mesh size resulted in a higher condition factor of breams than that through 1.2 mm mesh size. There was no effect of hammer mill screen size on hepatopancreas index, relative length of intestine or digestive enzyme activity. In conclusion,it might be better to grind the feed of blunt snout bream through 1.0 mm mesh size.