- Immunization of avian influenza in chick cage
Critical protection value 4-6log2
The age of the first immunization should be around 10 days of age, but because the immune system is not fully developed to affect the response effect, the antibody rises slowly and declines rapidly. 14 days after immunization, the antibody titer can reach 5.86-7.45log2, which can protect the chickens 100%. The antibody can reach the highest peak 28-35 days after immunization, and the 100% protection period is 2 months. - Can the emergency vaccination of the Ⅰ line vaccine cure chickenpox?
It can effectively control! After chicken pox occurs in Chicken in chick cage, emergency vaccination with 2 times the amount of I vaccine can effectively control the occurrence and development of chicken pox, because I vaccine can stimulate the body to produce interferon, and the produced interferon can interfere with the pox virus replication to control disease. - Correct use of vaccine protective agents
The purpose of vaccine protective agents is to protect the activity of vaccines, promote the response of vaccines in the body and form completely strong antibodies. There are three commonly used vaccine protective agents.
A.Skimmed milk powder can prevent the damage of cations in water to vaccine activity.
B.Levamisole is the second type. Its mechanism of action is to restore and improve the response of the vaccine when the body’s phagocytes and immune system are abnormal. Use 8 tablets/kg feed, and use it continuously for no more than 4 days.
C.Nutrition factors: Antibody is actually a macromolecular protein. Its formation requires Fe, Cu, Zn, Se, and amino acids. Supplementing such nutrients can form antibodies with higher titers.
- Correct understanding of double antibody
Double antibody is currently one of the fastest and most effective methods for the treatment of Bursa.
Double antibodies contain bursal antibodies or Newcastle disease antibodies, but from the point of view of the processing technology, the bursa is the mainstay and there are very few Newcastle disease antibodies formed, and no serum is effective at all, so double antibodies are effective in the treatment of Newcastle disease is not obvious. The effective duration of the double antibody is 5-7 days, and the effect of the second injection is better.
- Occurrence and spread of Newcastle disease
The occurrence and spread of a disease will have four periods: incubation period, prodromal period, obvious symptom period, and regression period. During the incubation period or prodromal period, timely detection and treatment can effectively prevent it. In the early stage of atypical Newcastle disease (or before the symptoms are obvious), there must be low or poor antibodies in a flock. They first show signs: hair on the top of the head, drinking water and spitting into the trough or water tank, don’t. of healthy chickens quickly eat spit-stained feed, or drink water that contains the virus, which spreads through the digestive tract. The Newcastle disease virus begins to replicate in chickens. When the number of viruses reaches a certain level, the chickens will have yellow-green loose feces, decreased feed intake, decreased egg production, and death. Another route of transmission is respiratory transmission. This mode of transmission will result in widespread transmission in chick cage.
