Antagonistic Bacillus species is one of the most promising probiotics which can be used as a substitute for antibiotic feed additives.It is important to facilitate the application of antagonisticBacillus species in aquaculture to reduce the abuse of antibiotics.In this article,the current research and application situations of antagonistic Bacillus species in China are introduced.Meanwhile,current problems are discussed.Moreover,we suggest that the study of antagonistic Bacillus species in aquaculture should be strengthened.
This study aims to explore the effects of different feeding methods(grazing+supplementary feeding,and house feeding)on the production and reproductive performance of Sanhe cattle.Forty cows of similar weight,age,and parity,who have been pregnant for 5 months,were selected as experimental animals and randomly divided into two groups:the control group and the experimental group.The feeding method of the control group's cattle is grazing+supplementary feeding,while the feeding method of the experimental group's cattle is house feeding.After a 5-month feeding period,the production performance indicators and reproductive performance indicators of the cows were measured.The results showed that compared with the control group,the production indicators of Sanhe cattle in the experimental group,such as milk yield,milk fat rate,and milk protein rate,were significantly improved,and their reproductive performance was also significantly better than that of the control group.In summary,in order to achieve high milk production performance and good reproductive performance in the process of raising Sanhe cattle,it is necessary to raise them in captivity.
Select 21 milk products of 7 types available on the market for chloramphenicol residue detection,through matrix spiking tests,exploring the impact of different milk matrices on test results.The results showed that fat index was the main factor affecting the recovery rate of chloramphenicol detection in the 21 milk products sold on the market.This study attempted three different methods to reduce the emulsification reaction between fat and ethyl acetate during the extraction process.Finally,it was determined that the low-temperature high-speed centrifugation method can effectively improve the recovery rate of chloramphenicol detection in high fat milk matrix without reducing the efficiency of the inspection work.The method optimization results showed that the average recovery rate of high fat milk increased from 65%to 93%,with an inter batch standard deviation of 6%.This indicates that after the optimization of the pre-treatment extraction method,the impact of fat in the milk matrix on the results decreased,and the method accuracy is high.It can be used for the detection of chloramphenicol residues in milk.
Heilongjiang Province as one of the important beef cattle breeding bases in China,has rich beef resources and good ecological environment.Through measures such as policy support,technical training and market promotion,Heilongjiang Province has promoted the implementation of the"Wagyu Industrialization Construction Project",providing new opportunities to fill the domestic high-end beef market.This paper summarizes the development of Heilongjiang Province's wagyu cattle industrialization,analyzes its development status and prospects,and provides suggestions for the development of Heilongjiang Province's Wagyu cattle industrialization.
Social service is a reflection of the quality of higher vocational colleges and an important platform for improving the level of"double-qualified"teachers.The article takes the field of animal medicine as an example to analyze the current situation and existing problems in the construction of the"double-qualified"teacher team in this field.By investigating the requirements of professional enterprises,governments,and individuals for the training of schools,professional teachers,and students,it provides suggestions on how to use social services as a medium to build a"double-qualified"teacher team in vocational colleges,improve the social service level of"double-qualified"teachers,and put forward actionable suggestions.
