Respiratory Diseases of Pigs in the later stage of Conservation

The conservation stage is not only the most important period in the whole growth cycle of piglets from birth to out of the pen, but also the period of physical fragility and the lowest resistance of piglets, and it is also the most difficult period of nursing. Because it is a link between the past and the future, it is very important to pay attention to this period. In the early stage, piglets often face the problem of diarrhea after weaning, while in the later stage, it is mostly respiratory problems. Especially since the end of last autumn, respiratory diseases have become more and more complex and difficult to control, which has become the most thorny problem for pig farmers.

The common symptoms of respiratory diseases in the conservation stage are sneezing, coughing, wheezing, abdominal breathing, gradual weight loss, dark hair, pale skin, decreased feed intake, like lying, unwilling to move. Once obviously emaciated, treatment is often ineffective, mostly with death. In the colder season, in order to keep warm in the house, poor ventilation, poor air quality, the incidence of respiratory diseases is relatively high; in the warmer season of early spring and summer, the air is relatively fresh, but respiratory diseases still occur, of which distribution is the most common and difficult to control. According to the domestic situation, respiratory diseases are mainly mycoplasma infection, mixed infection of Pasteurella multocida, Bordetella, Streptococcus, Actinobacillus pleuropneumoniae, Escherichia coli and so on. Some pig farms have the possibility of pseudorabies virus, classical swine fever virus, blue ear disease virus infection, and even circovirus (PCV) infection. Most of the pathological changes were pneumonia, pleuropneumonia, pericarditis and even peritonitis. Pulmonary apical lobe, cardiac mesenchymal degeneration, symmetrical hemorrhage on the dorsal side of the diaphragmatic lobe or consolidation of the ventral margin. In severe cases, the whole lung consolidation, increased specific gravity, cellulose exudation of the sharp lobe, cardiac lobe or diaphragmatic lobe, or fibrous adhesion of the whole lung and pleura, pulmonary interstitial edema, variegated, elastic; pericardial effusion or pericardial adhesion with the heart; there is pus in the abdominal cavity or purulent membrane around the liver. The incidence of the disease varies from pig farm to pig farm. The high incidence rate in winter is more than 40%, and the low incidence rate is about 15%. The warm season is about 10-20%, but the mortality rate is high. Once there is a higher incidence, the production status of pigs will decrease significantly, the growth rate will slow down, the feed reward will be reduced, the fencing time will be delayed, and the drug cost will increase during the whole conservation stage. Therefore, in order to control the disease, early administration and early prevention are necessary. The following measures are recommended:

1. Prevention of early infection

1)。 Sows are fed with drugs before and after delivery, one is to reduce the content of mycoplasma in the respiratory tract, to reduce the chance of early infection of mycoplasma in the delivery room, and the other is to clean up the bacteria in the birth canal, such as Streptococcus, Escherichia coli, salmonella, etc. to prevent early infection in the process of delivery. The common drug regimens are:

80% sodium bicarbonate 125g + doxycycline 100g, or 80g crude 125g + 12% Kelipin 2000 g + sodium bicarbonate (baking soda) 1000 g, or 80% crude net 125g + sulfamethoxazole 500g + TMP 100g + sodium bicarbonate (baking soda) 1000 g, mixed into 1 ton of material and fed continuously 1 week before and 1 week after delivery.

2)。 From 14 days old, sensitive drugs were used to control the infection of mycoplasma, streptococcus, Pasteurella multocida and so on.

The common schemes are as follows:

80% of the original net 190g + amoxicillin (pure powder) 150g + 1000 g colistin sulfate mixed with 1 ton of material, fed continuously until 100% of the original net 100g + amoxicillin 100g, added 1 ton of water, continued to drink water every other week, "pulse" medicine until the change (about 35-40 days old piglets).

two。 Continuous use of drugs during conservation to control mixed respiratory tract infection and reduce the occurrence of emaciated piglets

The following schemes are commonly used:

80% of the original 100 grams + 150 grams of doxycycline or 150 grams of amoxicillin were mixed with 1 ton of material and fed continuously until they were transferred into the growth and fattening house.