Effects Of Cane Condensed Molasses Soluble From Saccharomyces Cerevisiae On Production Performance,Serum Biochemical Parameters And Rumen Fermentation Parameters Of Lactating Dairy Cows

This experiment was conducted to study the effects of cane condensed molasses soluble from Saccharomyces cerevisiae(CMS)on production performance,serum biochemical parameters and rumen fermentation parameters of lactating dairy cows.Sixty Healthy Holstein cows were randomly divided into 4 groups of 15 cows in each group with similar body condition,parity,lactation age and milk yield.The control group(CON)was fed with basal diet,and the experimental group was fed with 1%,3%and 5%CMS on the basis of dry matter of the control group,namely CMS1 Group,CMS2 Group and CMS3 group,respectively.Each group was kept equal energy and equal nitrogen.The pre-feeding period lasted for 14 days,and the experimental period lasted for 54 days.The results are as follows:1.Effects of adding CMS in diet on performance and apparent digestibility of nutrients in lactating dairy cows.The results showed that:1)Adding CMS in diet had no significant effect on DMI,4%FCM and FCR(P>0.05).The milk yield of CMS1 group was significantly higher than CON group from the 1st to 18th day(P<0.05).The milk yield of CMS1 group was increased by 8.21%compared with CON group from the 36th to 54th day(P>0.05).The total average milk yield in CMS1 group was 7.73%higher than CON group(P>0.05).2)There were no significant differences in milk fat percentage,lactose percentage,total milk solids,MUN content and SCC(P>0.05).The milk protein percentage of CMS2 group was significantly higher than CON group(P<0.05).3)The apparent digestibility of NDF and ADF were not significantly affected by adding CMS in diet(P>0.05).The digestibility of OM in CMS3 group was significantly lower than CON group and other groups(P<0.01).The digestibility of CP in CMS 1 group was significantly higher than CON group and CMS3 group(P<0.01),and that of CMS2 group was significantly higher than CMS3 group(P<0.05).4)The economic benefit of CMS1 and CMS2 group was 5.70 yuan/head and 1.90 yuan/head more than CON group.In a word,CMS1 group had the highest economic benefit.2.Effect of adding CMS in diet on serum biochemical indexes of lactating dairy cows.The results were as follows:1)Adding CMS to diet had no significant effect on HGB,PLT and HCT(P>0.05).At the 18th day,RBC in CMS1 group was significantly lower than that in CON group(P<0.05).2)Adding CMS in diet had no significant effect on the enzyme content in serum of lactating dairy cows(P>0.05).At the 18th day of experiment,the levels of serum ALP in CMS1 group and CMS2 group were lower than in other groups(P=0.07).3)The contents of TP,ALB,GLO and UA were not significantly affected by adding CMS in diet(P>0.05).At the 18th day,CREA content of CMS3 group was significantly higher than other groups(P<0.05).BUN content of CMS1 group was lower than other groups(P=0.07).At the 36th day,the BUN content of CMS3 group was significantly higher than other groups(P<0.05).4)The content of T-BIL,CHO and TG in serum was not significantly affected by adding CMS in diet of lactating dairy cows(P>0.05).The content of NEFA in CMS3 group was significantly higher than in CON group and other experimental groups(P<0.05).At the 36th day,the content of total SOD was increased by adding CMS(P=0.09),and the content of NEFA in CMS2 and CMS3 groups was significantly higher than in CON group(P<0.05).At the 54th day,adding CMS increased TG(P=0.06).SOD content in CMS2 group and CMS3 group was significantly higher than in CON group(P<0.05).Adding CMS could significantly reduce NEFA content(P<0.05).3.Effects of CMS supplementation on rumen fermentation and microflora in lactating dairy cows.The results showed that:1)The content of microbial protein(MCP)in CMS1 group and CMS2 group was significantly higher than CON group(P<0.05).The content of propionic acid in CMS1 and CMS2 groups was higher than CON group,and the difference was not significant(P>0.05).2)CMS1 group improved the diversity of rumen microflora in lactating cows.3)At phyla level,Bacteroidetes and Firmicutes were the dominant flora.At genus level,Prevotella and Succiniclasticum were the dominant flora.The study indicated that adding 1%and 3%CMS to dairy diet is the best way to improve the production performance,economic benefit and anti-oxidation ability of the body.Therefore,it is suggested that 1%-3%is suitable for adding CMS to the diet of lactating cows.