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Mature horses appear to develop a certain degree of resistance to this parasite, but it is a concern for younger horses up to about two years old. [4] P. equorum is one of the few parasites where a natural immunity develops in the host. [3] However, when an infection is found in an adult horse, both the worm and egg counts are substantially low ...
Treating a horse with regular dewormer when they have the worms inside of them may cause the worms to migrate all at once, causing rupture of the intestines and lead to death. [11] Recommendations for deworming horses include performing fecal egg counts to determine what kind of protection each individual horse requires and alternating products ...
After the eggs have hatched in the feces, the larvae are ingested by the maggots of various flies that lay their eggs in the feces (such as Stomoxys (the stable fly) or Musca (the house fly). The nematode larvae develop within the maggot for about one week (depending upon ambient temperature), as the maggots mature into the imago (adult) fly .
Equine protozoal myeloencephalitis in various stages. Equine protozoal myeloencephalitis (EPM) is a disease that affects the central nervous system of horses. It is caused by a protozoal infection that is brought about by the apicomplexan parasites Sarcocystis neurona or Neospora hughesi. Most cases are caused by S. neurona.
Lifecycle is similar to mosquitoes: females lay eggs on plants at surface of streams and rivers; larvae settle onto solid substrate in water and feed on suspended organic detritus; pupation occurs at water surface. Hosts are most livestock species, horses and poultry and many wild animals. Humans also may be severely distressed by blackflies.
As a result, most veterinarians now recommend deworming for small strongyles based on fecal egg counts to minimize the development of resistant parasite populations. [15] Fecal egg count reduction tests can also be performed to identify which dewormers are effective on a particular farm.