Evaluation Of Nutritional Value Of Intercropping Corn With Lablab Bean In Dairy Cows

This study estimated the fermentation characteristics and chemical composition of corn silages(Longfudan208) and corn-lablab bean mixture silages. We compared the nutritional content differencebetween the purely sowed Corn silage (Longfudan208) and corn-lablab bean mixture silages before andafter ensiling and evaluated them according to silage evaluation standard. By simulating the in-vitro gasproduction and through detecting the in-vitro accumulative gas production(GP) in dairy cattle was studied.This paper was aimed at discussing mixed forage legume silages providiing references for improvingdisgestion of dairy cattle from the results of effective degradation rate of nutrient of diet in rumen, apparentdigestibility of dairy cow, internal environment of rumen, milk yield, milk fat percentage, milk proteinpercentage and somatic cell count, performing good perspective of application.1. Evaluation of Nutritional Value of pre-ensiled and post-ensiled corn silage of Longfudan208speciesand the mixed sowed corn silage of Longfudan208with corn-lablab bean.Silage corn was sown alone or intercropped with lablab bean. The nutritional content of Silage Corn,including DM，CP，NDF，ADF，EE，WSC, ASH, Ca，P were measured by National Standard Feed stuffNutriton Analysis Methods. We compared the nutritional content difference between the purely sowed Cornsilage of Longfudan208species and the mixed sowed Corn silage of Longfudan208with legume before andafter ensiling, and evaluated them according to silage evaluation standard. The results showed both silages arehigh-quality. The mixed sowing Silage Corn can significantly improve the contents of DM and CP (P<0.05)and increase the crude protein of14.79kg every acre, performing good perspective of application.2. The effects of corn silage of Longfudan208species and the mixed sowed corn silage of Longfudan208with corn-lablab bean on the rumen environment, fermentation products and the effective degradation in dairycattle by gas prodution technique.The artificial rumen trial was divided into control (Ⅰ)and trial(Ⅱ) groups, in which three ruminallycannulated Holstein cows having a similar weight with a permanent ruman fistula and health were fed withdiets containing corn silage and corn-lablab bean mixture silages, respectively. Dietary forage to concentrateratio were50:50. And through detecting the in-vitro accumulative gas production (GP), degradation rate ofneutral detergent fiber, degradation rate of acid detergent fiber and content of bacteria nitrogen for48hours onfermentation in dairy cow rumen was studied.The results indicated that compared with the controlⅠ,trialⅡcould increase the GP significantly(P<0.05).The profiles of pH value were chaged similarly, the pH value gradually decreased at0hour, to8hour to aminimum, the pH value decreased faster in treatmentⅡat0to8hour. And the pH value gradually increased incontrolⅠ,trialⅡ at8to24hour, the pH value had no difference between controlⅠand treatmentⅡ(P<0.05).TreatmentⅡ increased ammonia Nitrogen(P<0.05), ammonia Nitrogen concentrate gradually increased incontrolⅠ,trialⅡ at0to4hour, ammonia Nitrogen had difference between controlⅠand trialⅡ(P<0.05),ammonia Nitrogen of trialⅡdeclined more than in controlⅠat4to8hour, ammonia Nitrogen had a slowdownward trend in two groups at8to48hour. Concentrate of acetic acid and propionic acid had no differencebetween controlⅠand trialⅡ(P>0.05), Concentrate of acetic acid and propionic acid reached the highest since in controlⅠ,trialⅡ at4hour. Ratio of C2/C3were lower than three in controlⅠand trialⅡ. Butyric acid andTotal Volatile Fatty Acid had no difference between controlⅠand treatmentⅡ. And increased the effectivedegradability of dry matter, neutral detergent fiber, acid detergent fiber and crude protein(P<0.05).3. The effects of corn silage of Longfudan208species and the mixed sowed corn silage of Longfudan208with corn-lablab bean on Apparent digestibility, milk yield and milk composition of dairy cattle.Sixty multiparous lactating Holstein cows were randomly divided into three treatment groups.GroupⅠwas fed with diets containing corn silage. For groups ⅡandⅢcorn silage was replaced with the samefresh and dry matter (DM) weight of corn-lablab bean mixture silages. The results indicated that DM, CP,NDF,and ADF degradability in the trial group were higher than those in the control. Higher DM, CP, NDF, and ADFdigestibility and lower milk somatic cell counts were observed in groupsⅡand Ⅲ compared withgroupⅠ.GroupⅡ produced higher milk yield and milk protein compared with groupsⅠand Ⅲ. GroupsⅠandⅡ had the same cost of diet, but the net income in groupⅡ was7.67yuan/day/cow higher than that in groupⅠ.The cost of diet and net income in groupⅢ were1.33yuan/day/cow lower and1.00yuan/day/cow higher netincome compared with groupⅠ, respectively. In conclusion, corn-lablab bean mixtures improved thefermentation characteristics and nutrient value of silage compared with monoculture corn. In this study,replacing corn silage with the same fresh weight of corn-lablab bean mixture silages in dairy cow dietenhanced milk yield and milk protein of dairy cows and in-vitro ruminal degradability of diet in northernChina.