Coccidiosis
is a commonly-seen cause of diarrhea, especially in the young animal.
The organism responsible is a protozoan parasite, Eimeria steidae. Other forms of the Eimeria species can also cause disease.
There
are two distinct forms of coccidiosis; liver and intestinal. Liver
coccidiosis is usually affects the young to yearling animal, and is
manifested largely on a non-clinical level, save for possible lack of
gain, and perhaps a slight persistent diarrhea.
The
intestinal form is more common, especially in those animals on high
carbohydrate, low fiber diets. Signs are seen anywhere from three weeks
of age through adulthood as populations of Eimeria become high enough to cause problems for GI tract.
Some
signs of intestinal coccidiosis are: severe diarrhea with a sudden
onset; persistent non-responsive diarrhea which is not alleviated by
increasing fiber levels in the diet; or a positive fecal flotation test
for coccidiosis.
Eimeria
is a small protozoan parasite which colonizes the crypts of the
intestinal wall. As higher numbers accumulate, damage may be done to
the wall of the gut, and a diarrhea with an extremely distinctive odor
is released.
Once
smelt, never forgotten; a fecal flotation test should be performed
immediately to differentiate coccidiosis from other causes. A positive
result means it is time to treat the herd and step up one's
disinfection program.
Coccida
are parasites, and as such, shed eggs which are infective after 24
hours out of the body, which is why a disinfection program is
essential. Daily removal of all fecal material from the cage wires,
resting boards, and floors will aid greatly in reducing the occurrence
of coccidial enteritis.
Liver
coccidiosis is not usually a great cause of diarrhea, but is a
significant cause of unthrifty appearance and lack of gain due to liver
damage.
The
damage done to the liver and bile duct can appear as small,
pencil-point white areas on the liver; in some very severe cases,
larger areas of the liver may be discolored.
These
livers are not safe for human consumption and must be discarded, which
is a complaint often heard from the processor as well.
Treatment
of coccidiosis of either type may be accomplished by a common method.
This is the use of a sulfa drug such as sulfadimethoxine,
sulfaquinoxaline, or sulfamethazine as directed by the veterinarian.
This
drug class is one of the small number approved for rabbits; however,
dosage should be determined by the veterinarian and caution must be
taken to observe the prescribed withdrawal period before using the
animals for meat of any kind.
Once
treated, the animals generally recover without major recurrence.
Outlook after treatment is promising, and unless the animal experienced
severe and prolonged dehydration, recovery is swift and uneventful.
Keeping dietary fiber levels high is helpful in encouraging recovery.
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