The Effect Of Appension Of B.licheniformis On Production Performance And Health Of Lactating Dairy Cow

The standard bacterial strain of B.licheniformis was cultured and produced under the condition of the industrial production. The production technology such as the various parameter indexes and the best nutrient culture medium was determined.Eighty lactating Holstein dairy cows were divided randomly into four groups with 20 dairy cows in each group. 1 billion, 2 billion, 3 billion and 0 B.licheniformis were respectively added into per kilogram cow diet of the trail group 1, 2, 3 and the control group. Comparatively with the control group, the milk production of the three trail groups was higher and thereinto the group of adding 2 billion B.licheniformis per diet increased the most significantly (p<0.05). The common components of milk in the trail groups were improved in contrast with the control group (p>0.05).Otherwise, the urea nitrogen in blood serum reduced but total albumen, glucose and triglyceride in blood serum increased in this experiment. It explained that feeding B.licheniformis agent had the trend to improve the utilization ratio of feed but not evidently (p>0.05).It was hot season in experimental period. In this condition, hot stress could make the milk yield descend and the quality of milk be week. So, that adding B.licheniformis agent could improve lactating performance showed B.licheniformis agent could relief cow's hot stress effectively.After all, the experiment explained B.licheniformis agent had effective meaning to cow. The effective content of liable bacterium and products of metabolism in the agent could balance and improve the dominance of beneficial microbe in rumen, restrain the growth of pernicious microbe, improve the utilization of feed, enforced the immunity of body and increased the ability to resist bad stress.