These are the real symptoms and prevention and treatment methods of PRRS, stop getting it wrong!
A while ago I saw many pig farming friends discussing whether blue discoloration on pigs means PRRS. Today I will explain in detail what PRRS actually is and how to identify it. It is not the case that blue skin means PRRS. Friends, remember this.
First, let's look at the basis for identifying PRRS:
1. Conjunctivitis, eyelid edema; respiratory symptoms such as coughing and wheezing.
2. Some pigs show neurological symptoms such as weakness of the hindquarters, inability to stand, or ataxia.
3. Sow abortion and premature birth exceed 8%, stillbirth rate exceeds 20%, piglet mortality exceeds 25% in the first week after birth, and adult pigs may also die.
1. Diseased pigs mainly show interstitial pneumonia, with visible widening of pulmonary interstitial edema
2. Sometimes there are blue hemorrhagic spots at the subcutaneous pores, and sometimes conjunctivitis causes protruding eyeballs.
3. Lymph nodes are enlarged, with visible necrotic foci on the cut surface, and sometimes obvious hemorrhagic spots can also be seen in the kidneys.
4. Aborted fetuses show obvious hemorrhagic spots on the body surface.
5. In the middle and late stages, secondary diseases such as classical swine fever, Haemophilus parasuis, and Eperythrozoonosis may occur, and the pathological changes will change accordingly.
The above is an overall basis for identification. Next, let's talk separately about the specific changes of PRRS in different pigs.
SowsIn the early stage of the disease, they show poor spirits, fever, reduced appetite, or complete refusal to eat. After a few days, abortions, stillbirths, mummified fetuses, and weak piglets appear one after another. A small number of sows develop red or blue-purple hemorrhagic spots on the skin of the ears, buttocks, and extremities.
BoarsSymptoms include coughing, difficulty breathing, poor appetite, and decreased sexual function such as dead sperm and no sperm. It spreads quickly, with an incidence rate of 50% to 100% and a mortality rate below 1%.
PigletsThey show a higher proportion of weak piglets, listlessness, reduced feed intake, unsteady walking, pale skin, inflamed and edematous conjunctiva, protruding eyeballs, and light blue skin around the eye sockets. Diseased pigs show difficulty breathing and abdominal breathing, and sometimes coughing and mild fever. The incidence rate is about 50%, and the mortality rate is above 20%.
Growing and finishing pigsThey mainly show panting, coughing, difficulty breathing, abdominal breathing, protruding eyeballs, and flu-like symptoms. Sometimes blue hemorrhagic spots can be seen at the pores of the skin on the ears and abdomen, and some also develop blue or purplish-red hemorrhagic spots.
Now that you have determined whether it is PRRS, next let's look atPrevention and treatmentMethods:
During the period when the pig herd is infected with PRRS, the use of live vaccines is prohibitedBreeding pigsherd. Second, after 2-3 months of drug control, once the pig herd has stabilized, you can try vaccinating with the PRRS vaccine.
In addition, for farms without PRRSpig farmsit is not recommended to vaccinate against PRRS, because this disease is an immunosuppressive disease, and the vaccine also has immunosuppressive effects. The key point of prevention is to prevent diseases that induce this disease, such as asthma, classical swine fever, and porcine contagious pleuropneumonia, and another point is to strengthen feeding management.