Study On Rumen Degradability And Feeding Value Of Saccharomyces Cerevisiae Culture Using Distiller’s Grains As Substrate In Dairy Cows

The aim of this research is to perform a detailed analysis of the basic nutrient value of Saccharomyces cerevisiae culture using distiller’s grains as substrate（SC）,make a comparison with one kind of forage and one kind of concentrate based on the rumen degradation characteristics,explore the effect of the addition of SC to dairy diets on the production performance,apparent digestibility of nutrients,whole blood routine,serum index and rumen fermentation function of dairy cows and offer further theoretical basis for the practical application of SC in Chinese dairy cows.Experiment one:Five Holstein cows with permanent ruminal cannulas were selected to determine the rumen degradation rate of dry matter,crude protein,NDF and ADF using SC,alfalfa and soybean meal as experimental materials.The results showed that:1)the effective degradation rate of dry matter in SC was the lowest in 3 kinds of feed materials and was significantly lower than the rate of alfalfa（P<0.05）;2)the effective degradation rate of crude protein in SC was the highest and was significantly higher than that of soybean meal（P<0.05）;3)the effective degradation rate of NDF in soybean meal was the highest and was significantly higher than the rate of alfalfa and SC（P<0.05）,but there was no significant difference between the rate of alfalfa and SC（P>0.05）;4)the effective degradation rate of ADF in soybean meal was the highest and was significantly higher than that of SC and alfalfa（P<0.05）.Followed was the rate of SC and was significantly higher than that of alfalfa（P<0.05）.Experiment two:Forty-five Holstein dairy cows with the similar milk yield,parity,milk composition and days in milk were selected and randomly assigned into 3 groups.The basal diet group was the control group,the diet of trail group I and the trail group II were added SC with 1%and 2%concentrate respectively in the basal diet.The results showed that:1)the diet of trail group I significantly improved the apparent digestibility of dry matter and the number of white blood cells in the blood（P<0.05）;highly significant increased the content of butyric acid in the rumen（P<0.01）;highly significant decreased the content of ALT in the serum（P<0.01）;there was no significant difference in the production performance,apparent digestibility of other nutrients,blood parameters and rumen fermentation parameters（P>0.05）between the trail group I and the control group;the average additional income in trail group I was 0.86 yuan per cow per day.2)the diet of trail group II highly significant improved the milk yield,the concentration of butyric acid in rumen and the content of Ig G（P<0.01）,significantly decreased the content of ALT in serum（P<0.01）,significantly improved the apparent digestibility of dry matter and crude protein,the number of white blood cells in the blood and the concentration of NH₃-N in the rumen（P<0.05）;there was no significant difference in the milk composition,dry matter intake and other blood routine indicators,serum indicators,rumen fermentation parameters between the trail group II and the control group;the average additional income in trail group II was 2.35 yuan per cow per day.In conclusion,the nutrient content of SC was high,the crude protein rumen utilization efficiency of SC was significant and the fiber degradation characteristics of SC was similar to that of alfalfa.The addition of 2%SC concentrate could enhance the production performance of dairy cows,improve the immune ability,maintain the rumen fermentation environment and consequently increase economic efficiency and profitability of dairy farms.