甜高粱凋萎青贮料在肉兔全混日粮中适宜添加量的研究

采用蜡熟期甜高粱进行不同时间的凋萎处理,并进行青贮,分析了甜高粱饲用品质和青贮发酵品质的变化,明确甜高粱在凋萎过程中的养分动态以及适宜青贮加工的时间。结果表明凋萎5 h,甜高粱含水量(59.70%)和WSC含量(8.60%)是青贮品质最优。选择凋萎5 h的甜高粱青贮料进行不同添加量(添加量为25%,30%,35%)的肉兔饲喂试验,将不同添加量的青贮料配制成肉兔的全价混合日粮(total mixed ration,TMR)颗粒料进行饲喂。测定肉兔的每周增重,试验结束后进行生化指标分析。结果表明青贮甜高粱在TMR中的添加量从25%增加到35%,饲养5周后肉兔的总增重从871.56 g增加到950.25 g,而TMR颗粒料中青贮甜高粱添加30%~35%时,肉兔血液中谷丙转氨酶、谷草转氨酶、碱性磷酸酶、乳酸脱氢酶4种酶的活性均低于对照组,表明在全混日粮中添加30%~35%的凋萎青贮甜高粱有利于肉兔生长。

The suitable addition amount of sweet sorghum wilted silage in the total mixed ration of rabbits

The objective of this experiment was to investigate the suitable addition amount of sweet sorghum (Sorghum bicolo) wilted silage in total mixed ration for rabbits.The dynamics of feeding and fermentation quality of sweet sorghum with different wilting times were firstly analyzed,so as to select a suitable wilting time for sweet sorghum harvested at wax ripeness stage.The results indicated that wilting for 5 hours was the optimum time,when water content dropped to 59.7％ and the nonstructural carbohydrates content was 8.6％.Four different addition amounts (control,25％,30％ and 35％) of the 5-hour wilted silage were used to make a total mixed ration (TMR) for rabbits,so as to investigate the effects and identify the optimum addition for rabbit growth and health.Weekly increased weight and biochemical indicators after the test were determined.The results showed that when the addition amount increased from 25％ to 35％ in TMR,the total weight gain after 5 weeks increased from 871.56 g to 950.25 g.When the addition amount was increased from 30％ to 35％,the activities of alanine aminotransferase,aspartate aminotransferase,alkaline phosphatase and lactate dehydrogenase enzyme were lower than in the control group.The results indicate that 30％-35％ is the suitable addition amount of sweet sorghum wilted silage in rabbit TMR.