Problems in the use of immune drugs in chickens

With the development of broiler breeding industry, many farmers regard raising broilers as the way to get rich, but there are still two major problems in raising broilers.

(1) blindly copy outdated immunization procedures: many households are immunized with Newcastle disease Ⅳ vaccine only once, until they are sold and no longer immunized with other vaccines; some chicken farmers develop infectious bursal disease in each batch of chickens, and the yolk fluid for treatment and injection contains Newcastle disease antibody, thus interfering with the immune effect of Newcastle disease vaccine. In infectious bronchitis epidemic areas, the vast majority of chicken farmers do not use infectious bronchitis vaccine, which have led to the occurrence of infectious diseases in chickens, resulting in huge economic losses. Therefore, farmers should pay attention to the immunity of flocks and require breeding farms to provide maternal antibodies to chicks, so as to determine the first immune age of Newcastle disease and bursal disease in chicks. It is suggested that broiler chickens should be immunized with Newcastle disease twice, the first immunity is 7-9 days old, and the second immunity is about 25 days old. The moderately virulent strain vaccine should be used in the areas with high incidence of bursal disease at the age of 14-16 days. In infectious bronchitis endemic areas, about 5-7 days old, they were immunized by nasal dripping or drinking water with H120 vaccine.

(2) Drug abuse the drugs used by most chicken farmers are very messy, including old and traditional medicines as well as new ones. For example, when chicks have diarrhea symptoms, they are fed with chloramphenicol in large quantities, often causing damage to the immune system; some chicken farms have just used microecological agents, followed by antibiotics, resulting in a counterbalance between the two effects. Misuse of drugs, on the one hand, is bound to increase drug costs, on the other hand, it also affects the balance of intestinal flora, resulting in nutritional imbalance in broilers, resulting in poor growth and decline in disease resistance. Therefore, when using drugs, chicken farmers should first find out which kinds of chicken diseases often occur in this area, which drugs have no obvious effect in this area, and screen out the drugs that are suitable for this area; secondly, they should observe carefully, analyze the causes carefully, diagnose and administer drugs early, and it is best to prevent them in advance.