Study On Modulation Technology Of Corn Straw Based TMR Silage

In this experiment,crushed corn straw mixed with alfalfa hay,sugar beet and concentrate feed,and combined with accessories such as mixing of different additives on TMR silage fermentation of corn straw quality,aerobic stability,effects of nutrient composition and feed value of sheep(experiment 1);The corn straw based TMR fermented feed was packed by vacuum packaging and through different storage time on the sensory index,fermentation quality,nutrient composition and particle size distribution was studied(experiment 2),to provide scientific theoretical basis for the future effective utilization of corn stalk resources for ruminant.(1)Crushed corn straw,alfalfa hay,sugar beet and concentrate feed mixed at ratios of 75%,5%,5%and 15%,respectively.Then,added 0.02% compound bacteria(treatment1),0.02% compound bacteria+1.5% urea(treatment2),1.5% urea(treatment3),0.02% compound bacteria+1.5% urea+0.1% salt(treatment4).The moisture content of mixed material was adjusted to 45%,and prepared to TMR silage.Studied the effect of different additives on TMR silage fermentation quality,aerobic stability,nutrients and feed value on sheep in diets.The results show that during the fermentation process of each treatment,temperature of TMR silage had no obvious rise.Compared with control group,the pH value in treatments2,3,and 4 slightly higher,but there was no significant differences in lactic acid and total acid contents between two treatments(P> 0.05);Compared with the control group,crude protein(CP)content in treatments 2,3 and 4 all increased to more than 10%,and neutral detergent fiber(NDF),acid detergent fiber(ADF)reduced significantly(P<0.05).With the increase of aerobic exposure time,the treatment of TMR feed fermentation lactic acid content in declined and the pH value went up,but the change of treatment 4 relatively slowly.The feed intake,feed intake rate and dry matter digestibility of treatment 4 were all significantly higher than other treatments(P<0.05).Above results show that when compound bacteria,urea and salt adding to TMR silage based on corn stalk has the optimal effects,which improved the storage of TMR silage,palatability,feed value,it can be extended in production.(2)The feed was using quantitative packing machine to load the plastic bag and after sealed,stored for one month(treatment 1)and three months(treatment 2)at room temperature,the fermentation quality,nutrient composition and particle size distribution of samples were analyzed.The results showed that the sensory evaluation of TMR silage for good.no significant differences between the treatments of water containing(P>0.05),the moisture content of treatment 1 and 2 were 54.66% and 53.8%,respectively.Lactic acid and total acid content increased with the extension of storage time,pH values was decreased.CP content significantly reduced in treatment 2(P<0.05).There were no significant difference in NDF and ADF contents between two treatments(P>0.05).After PSPS screening,the feed particle proportion of the first layer sieve had no significant difference between two treatments(P>0.05),while that of the second and third layer sieve and bottom pan existed significant difference(P<0.05).Therefore,the corn stalk-based TMR fermented feed had excellent fermentation quality,reasonable nutrient composition and particle size distribution,and could be stored for 1~3 months.Overall,modulation of TMR silage corn straw,mixed with bacteria,urea and salt while adding reach the purpose of TMR silage storage,improved nutritional value,palatability and intake;after packaging to extend the storage time to 3 months,no deterioration phenomenon,good nutrients and particle size,which can be used in production.