Effects Of Silage Broussonetia Papyrifera On Growth Performance、Serum Biochemical Indices、Rumen Fermentation Characteristics And Nutrient Digestion And Metabolism Of Meat Goat

Under the background of shortage of protein feed raw materials and heavy dependence on imports,the development and utilization of local herbaceous and woody feed raw materials are of great significance to the development of domestic aquaculture.Broussonetia papyrifera contains high protein and is widely distributed in our country.It can be developed into a new feed raw material to partially replace the traditional protein feed raw material so as to reduce the feeding cost and improve the quality of animal products.In order to study the effects of silage broussonetia papyrifera on the growth performance,serum biochemistry,rumen fermentation and nutrient digestion and metabolism of meat goat,this experiment explored the possibility and data basis that broussonetia papyrifera can be used as an excellent feed material for goat and ruminants to provide protein.In this experiment,48 4-month-old and 23kg-weight healthy goat ewes were randomly divided into 4 groups,The control group was the basic diet group,no silage broussonetia papyrifera（25%alfalfa hay was added to the basic diet）,In the test group 1,（18.75%alfalfa hay+6.07%silage broussonetia papyrifera and 0.18%cottonseed meal were added to the basic diet）,the test group 2,（12.5%alfalfa hay+12.15%silage broussonetia papyrifera and0.35%cottonseed meal were added to the basic diet）,the test group 3,（24.3%silage broussonetia papyrifera and 0.7%cottonseed meal were added to the basic diet）.The feeding experiment was carried out for 84 days.the pre feeding period was 14 days,and the normal feeding period was 70 days.The results showed that:（1）There was no significant difference in body weight at 30days and 70 days between the groups.The average daily gain of the test group 2 was the highest,significantly higher than that of the test group 3（P<0.05）.The average daily intake of dry matter and the ratio of feed to weight of the test group 3 were the highest;（2）In terms of economic benefits,the total income of the control group,test 1 group,test 2 group and test 3 group is 6079.5 yuan,5127.3 yuan,6355.8 yuan and 4854.6 yuan respectively,after deducting all costs,the net income of test 2 group is the highest;（3）the ALB content in the control group was significantly lower than that in the test 3 group（P<0.05）,extremely significantly lower than that in the test 2 group（P<0.01）,the GLU content in the test 1group was significantly lower than that in the test 3 group（P<0.05）,and the HDLC content in the test 2 group was significantly higher than that in the test 1 group（P<0.05）;（4）the p H value of rumen fluid in the control group is significantly lower than that in the test 2 group and the test 3 group（P<0.05）,the TVFA concentration in the control group is significantly higher than that in the test 1 group,the test 2 group and the test 3 group（P<0.01）,the concentration difference of NH₃-N between groups is not significant（P>0.05）;（5）The nitrogen utilization rate was the highest in test 1 group,and the apparent digestibility of nutrients in test group 1 and 2 was the most effective.According to the results,silage broussonetia papyrifera can be used as a feed raw material to feed meat goats,which can reduce the feeding cost and improve the protein utilization rate and nutrient digestibility in production.However,with the increase of the addition amount,various indexes have a downward trend.Therefore,when discussing the feeding effect of silage broussonetia papyrifera,special attention should be paid to the addition amount.Therefore,the application of silage broussonetia papyrifera in goat diets needs to be controlled within the appropriate addition amount.The result of this experiment is that the addition amount（12.15%）in the diets of the test group 2 in the experiment is better,and whether it is the optimal addition amount needs to be further studied.