According to domestic reports, the incidence of parasitic infection in large-scale pig farms in Sichuan, Hunan, Guangxi, Hubei and Henan was 61.11%, 57.68%, 78.70%, 81.88% and 56.61%, respectively. At present, the infection rate of roundworms in small-scale pig farms or free-range households in China has reached 86%, and the infection rate of whipworms has reached 52%.
With the change of culture practices, biogenic parasitic diseases (such as trematodiasis and taeniasis, etc.) have been controlled, while the incidence of soil-derived parasitic diseases (such as gastrointestinal nematode disease/coccidiosis/colonic pouch ciliosis, etc.) is still relatively high. In particular, some gastrointestinal nematodes, because of their simple life history, do not need intermediate hosts during development, and the resistance of the eggs is strong, easy to infect through drinking water or ground, is the most widespread parasitic disease in pig farms
The huge loss caused by parasites Parasitic infection can reduce the growth rate of fattening pigs by 2% to 21%.
With simple roundworm infection, the average daily weight gain of pigs decreased by about 60g.
Mite infection can reduce the growth rate by 4.5% to 12%.
Simultaneous parasitic infections in vivo and outside can reduce feed utilization by 13% to 25%.
In the United States alone, scabies mites cause up to $230 million a year in the pig industry, even higher than blue ear disease.
The loss caused by parasitic infection appears to be a boiled frog, which does not cause devastating losses in a short period of time, but can seriously eat up the profits of pig farms.