The Research Of Microbial Deodorant For Chicken Feed

Along with the development of national economy, animal husbandry has always keep developing at a high speed. However, environment pollution becomes more and more serious with the development of livestock. Noxious gases, such as ammonia and hydrogen sulfide from henhouses can not only harm health of the livestock staff, but also increase the morbidity rate of broilers and influence immune responses of vaccine, which threaten the growth and development and health of broilers.Each country takes the corresponding measure for the pollution of livestock. Home and abroad deodorant for the livestock mainly includes external deodorant and internal regulator. According to different mechanisms, external deodorant can be divided into physical deodorant, chemical deodorant and biologic deodorant. Internal deodorant can be divided into enzymic deodorant, vegetable deodorant and microbial deodorant according to the different sources.Microbial deodorant is usually added to fodder with the form of microbial feed additionally. Microbial deodorant can absorb harmful gases produced from animals, reduce injurious ingredients of feces and the production of odor, decrease fodder waste, and improve animal health conditions and production performance significantly. Therefore, the use of microbial deodorant can radically solve the problem of harmful gas emissions from animal breeding at the source and enhance culture benefit as well.In this research, the study subjects were microbes that approved by the country. We manually simulated the gastrointestinal tract of broilers and the microbial strains with well tolerated digestive tract were screened out. These microbial strains included: Saccharomyces cerevisiae, Candida utilis, Bacillus subtilis, Bacillus licheniformis, Enterococcus faecalis, Bacillus coagulans; microbial strains that can take advantage of ammonia effectively included: Saccharomyces cerevisiae, Candida utilis, Enterococcus faecalis, Bacillus coagulans, Bacillus licheniformis, Bacillus subtilis, Aspergillus niger, Aspergillus oryzae, Aspergillus oryzae X, Trichoderma koningii and Trichoderma viride.We secondly screened the strains with the consideration that they can produce protease, amylase and cellulose effectively and five kinds of strain were obtained: Candida utilis, Bacillus subtilis, Bacillus licheniformis, Enterococcus faecalis and Bacillus coagulans. They were used in feeding experiment and environmental monitoring experiment to test whether the quantity of Bacillus coli, Bacillus bifidus and lactobacillus in faeces changed after feeding, compared with that before feeding.The result was achieved through testing NH3 and H2 S in feces respectively before and after adding the microbes. It showed that the substance being able to effectively reduce ammonia emissions in combination of single bacterium and dixenie was Bacillus subtilis with 61.7% of removal rate, followed by Candida utilis with 56.6% of removal rate. The next was the combination of Bacillus subtilis and Candida utilis with 38.7% of removal rate. In terms of reducing the content of H2 S, Enterococcus faecalis proved to have a better effect and the reduction rate was 27.0%. The second was Bacillus subtilis, with a removal rate of 24.3% and the reduction rate for Candida utilis was 18.9%.After measuring the crude protein content in feces, we knew that the crude protein content of Enterococcus faecalis was 11.89 g, while that of dixenie combining Candida utilis and Bacillus coagulans was 11.80 g. At this moment, the feed digestibility remains the highest.