The Ministry of Agriculture announced the criteria for determining sick pigs
Recently, the Veterinary Bureau of the Ministry of Agriculture and the China Veterinary Drug Control Institute jointly compiled the Manual for Safe Use of Inactivated Vaccine for Highly Pathogenic Porcine Blue Ear Disease, published the quality standards for inactivated vaccine for porcine reproductive and respiratory syndrome, and published the criteria for determining the infected pigs.
According to the manual, the criteria for judging the sick pig are: temperature above 41℃ for at least 3 days; respiratory symptoms such as decreased mental appetite, conjunctivitis, cough and asthma; gross autopsy, flaky consolidation of lung apex or heart lobe. If the above three conditions are met, it can be judged as an illness.
The inactivated vaccine is milky white emulsion in appearance and water-in-oil type. Take a clean pipette and drip a small amount of vaccine into cold water. Except for the first drop, it shall not spread. Its quality can be checked by the following methods:
1. Use a 1 ml pipette (inner diameter of the lower opening is 1.2 mm, inner diameter of the upper opening is 2.7 mm) to suck 1 ml of vaccine at about 25℃, make it flow out naturally vertically, and record the time required for outflow of 0.4 ml, which should be within 8 seconds.
2. 5 pigs of 3-4 weeks old with PRRSV antigen and antibody negative were injected intramuscularly with 4 ml vaccine at the back of each ear. After observation for 21 days, there should be no local and systemic adverse reactions caused by vaccine.
3. Ten pigs of 3-6 weeks old with PRRSV antigen and antibody negative were used, 5 of them were injected intramuscularly with 2 ml vaccine at the back of ears, and the other 5 were used as controls. After 28 days, all pigs were injected intramuscularly with 3 ml of virulent PRRSV NVDC-JXA1 strain (containing 105 TCID50) in the posterior part of their pleura ears. Temperature was measured daily and observed for 21 days. All 5 control pigs should be sick and at least 2 should die; at least 4 vaccinated pigs should be alive.
The manual states that single-dose, single-dose repeat and overdose vaccinations of piglets are safe and should only be used under veterinary guidance. After vaccination, piglets have good mental state and appetite, and generally no adverse reactions are observed at the injection site and the whole body; vaccinated sows will not cause abortion, and a few sows may have transient appetite loss, which can be recovered within 1-2 days.
- Prev
How to improve pig nutrition
1. Nutrition of gilts. Nutrition and related nutrient reserves of gilts are important factors affecting the lifelong performance of gilts, and their nutritional levels should ensure the body needs during the reproductive period after maturity. Starting at 45 kg body weight, the dietary level should be 0. 1% to enhance the skeletal development of gilts. After gilts reach about 150 days of age and enter the gilt herd, their growth should be controlled and feeding should be restricted (2. 3--2。8 kg/day) A medium energy, high protein diet to reduce
- Next
Disease prevention of fish before storage and transportation
As the saying goes, "if you want to buy a chicken, you have to buy a fish." And many fish farmers after a year of hard work, to the adult fish sales season has encountered problems, fish are not resistant to storage and transportation, the whole body is congested, and even dead fish. At this time, most farmers think that there is something wrong with the feed. Indeed, in order to unilaterally reduce the feed coefficient and improve the growth rate of fish, some feed manufacturers add hormone or hormone-like drugs, such as olaquindox, to the feed, resulting in the above phenomenon in the process of fish storage and transportation. But it makes the fish intolerant of storage and transportation.
Related
- On the eggshell is a badge full of pride. British Poultry Egg Market and Consumer observation
- British study: 72% of Britons are willing to buy native eggs raised by insects
- Guidelines for friendly egg production revised the increase of space in chicken sheds can not be forced to change feathers and lay eggs.
- Risk of delay in customs clearance Australia suspends lobster exports to China
- Pig semen-the Vector of virus Transmission (4)
- Pig semen-the Vector of virus Transmission (3)
- Five common causes of difficult control of classical swine fever in clinic and their countermeasures
- Foot-and-mouth disease is the most effective way to prevent it!
- PED is the number one killer of piglets and has to be guarded against in autumn and winter.
- What is "yellow fat pig"? Have you ever heard the pig collector talk about "yellow fat pig"?