Effects Of Including Condensed Molasses Fermentation Solubles In Diets On Rumen Fermentation And Production Performance Of Dairy Cattle

Two experiments were conducted to study the safety and optimum feeding level of condensed molasses fermentation solubles(CMS) and effects on rumen fermentation, serum indexes, production performance, apparent digestibility of nutrient substance, and economic benefit of dairy cattle. The methods and results showed as follows:The first experiment: A total of 75 Holstein cows in peak lactation period were randomly divided into5 groups(control group, 0.5%CMS group, 1.5%CMS group, 2.5%CMS group and 5%CMS group) with15 replicates per group, and per replicate with 1 herd of cow according to similar or same age, parity,lactation days, somatic cell count(SCC)and milk yield. The basal diet was used as control group, and trial groups used 0.5% CMS, 1.5% CMS, 2.5% CMS and 5% CMS to feed dairy cattle respectively(TMR%).All the 5 diets were isoenergic and isonitrogenous. The preliminary trial period was 7 days and the formal experiment lasted for 45 days. The results showed that, The feeding level of CMS should not exceed 1.5%,or it would result in diarrhea of dairy cattle; The DMI of the control group, 0.5% and 1.5% CMS feeding groups were higher than 5% CMS feeding groups siginificantly(P<0.05); The milk yield of the control group, 0.5% and 1.5% CMS feeding groups were significantly higher than other groups(P<0.05), and the value of 2.5% CMS group were significantly highter than 5% CMS group(P<0.05); The milk protein percentage of control group, 0.5% and 1.5% CMS groups were higher than other groups significantly(P<0.05); The milk urea nitrogen of 2.5% CMS group were higher than 0.5% CMS group significantly(P<0.05).The second experiment was based on the first experiment, it was conducted to study effects of including CMS on rumen fermentation, serum indexes, production performance, apparent digestibility of nutrient substance of dairy cattle, when feeding the safe level of CMS. A total of 45 Holstein cows in middle lactation period were randomly allocated to 3 groups with 15 replicates and 1 herd per replicate per group based on age, body weight, parity, lactation days, somatic cell count and milk yield. Dairy cows inthe control group were fed a basal diet, and dairy cows in other two groups were fed 0.75% and 1.5% CMS(TMR%) in the basal diet, respectively. All the three diets were isoenergic and isonitrogenous. The experiment last for 75 days with the first 15 days as the adaptation.The results showed as follows: There were no effects of feeding CMS on rumen fermentation and serum indices of dairy cows(P>0.05); The dry matter intake and milk protein percentage of 1.5% CMS group were higher than 0.75% CMS group and control group significantly(P<0.05), the milk yield and apparent digestibility of CP of 1.5% CMS group were higher than control group significantly(P<0.05), 4% corrected milk of 1.5% CMS group was higher than it of 0.75% CMS group and control group significantly(P<0.01); Somatic cell count(SCC)of 0.75%CMS group was less than control group significantly(P<0.05); The addtional income over feed cost of1.5% and 0.75% CMS were higher than control group.The results of two experiments show that, The optimum feeding level of CMS was 1.5% and it should not exceed 1.5%, or it would lead to diarrhea of dairy cattle. And 1.5% CMS can increase the DMI, milk yield, milk protein percentage and apparent digestibility of CP. CMS could also decrease SCC in some degree and bring some economic benifit.