Research On Silage Processing Of Hybrid Broussonetia Papyrifera And Its Effect On Feeding Male Cows

Hybrid Broussonetia papyrifera(hereinafter referred to as Broussonetia papyrifera)is a new type of Broussonetia papyrifera cultivar bred by Institute of Botany,Chinese Academy of Sciences.It has the characteristics of high yield and rich protein content.It is an unconventional forestry protein feed resource with great development value.In order to better develop and utilize Broussonetia papyrifera feed resources,the following studies were carried out in this experiment.Experiment 1: Study on suitable harvest time and silage technology parameters of Broussonetia papyrifera feed.The stem and leaf samples of Broussonetia papyrifera in different growth stages were collected to determine its nutritional components and biological yield,and the suitable harvest time of Broussonetia papyrifera was comprehensively evaluated.Lactobacillus plantarum,Pediococcus lactis and Lactobacillus brucelli were selected as fermentation strains to study the process parameters of fresh,semi dry and Mixed Silage of Broussonetia papyrifera.Orthogonal design was used to optimize the combination of strains,materials,moisture content,silage time and other conditions.Sensory index,chemical index and nutritional index were used as the basis to determine the quality of silage,and the optimal combination of silage process parameters was finally determined.The results showed that:(1)based on the biological yield and nutritional value of Broussonetia papyrifera,the most suitable harvesting height of Broussonetia papyrifera was 1.2m(2)The optimal parameters of fresh Broussonetia papyrifera silage were as follows:Lactobacillus plantarum: Pediococcus lactis: Lactobacillus brucelli 4:1:1,molasses 3% and cellulase 9% × 103 U / kg,silage time 60 days(3)The results showed that the optimum process parameters of Broussonetia papyrifera Mixed Silage were as follows: the content of straw was 10%,the combination of strains was Lactobacillus plantarum: Pediococcus lactis:Lactobacillus brucelli was 2:1:1,the addition of molasses was 3%,and the addition of cellulase was 6% × 103 U / kg,silage time 60 days(4)The results showed that the optimum process parameters of Broussonetia papyrifera semi dry silage were as follows: moisture content 55%,Lactobacillus plantarum: Pediococcus lactis: Lactobacillus brucelli 4:1:1,molasses 3% and cellulase 9% × 103 u / kg,silage time 60 days.Experiment 2: Study on feeding effect of Broussonetia papyrifera silage on dairy bulls.Thirty dairy bulls aged about 12 months and weighing about 330 kg were randomly divided into three groups with 10 bulls in each group.The control group was fed the original pasture diet,and the other two groups were fed different amounts of Broussonetia papyrifera silage instead of 50% and 100% alfalfa hay in the original diet Finally,the appropriate amount of Broussonetia papyrifera silage was selected.The results showed that:(1)there was no significant difference in daily gain,feed intake and feed to weight ratio of dairy bull when Broussonetia papyrifera silage was used to replace 50% and 100% alfalfa hay in the diet(P >0.05)(2)When Broussonetia papyrifera silage was used to replace 50% and 100% alfalfa hay in the diet,there were no significant differences in ruminal fluid p H,tvfa,percentage of acetic acid,propionic acid and butyric acid,ratio of ethylene to propylene,NH3-N and microbial protein concentration of dairy bull(P > 0.05)(3)Using Broussonetia papyrifera silage instead of 50% and 100% alfalfa hay had no significant difference in apparent digestibility of DM,CP,NDF,ADF and EE(P > 0.05)(4)When Broussonetia papyrifera silage was used to replace 50% and 100% alfalfa hay in the diet,the daily feed cost was significantly reduced(P < 0.05);The daily profit of using Broussonetia papyrifera silage instead of 100% alfalfa hay in the diet was significantly higher than that of the group without Broussonetia papyrifera silage(P < 0.05).In conclusion,high quality Broussonetia papyrifera silage can be obtained by microbial enzyme fermentation,which can completely replace alfalfa hay in dairy bull diet and improve economic benefits.