IN –92, Grassi and Rovelli1 fed onchospheres of Davainea proglottina to the slugs Limax cinereus, Agriolimax agrestis and Limax flavus and were able in . Davainea proglottina: pictures (1). To cite this page: Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. The Animal Diversity. of this outer coat. The wrinkled or corrugated surface reminds on what of the gelatinous coat of an Ascaris egg. A rather heavy fibr delimits the heart-shaped.
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It is found worldwide. It is quite common in traditional and free-ranging poultry. The disease caused by this parasite is called davaineosis. Davainea proglottina does not affect dogs, cats, cattle, sheep, pigs, horses or other mammals. Davainea proglottina is a small tapeworm, usually not longer than 4 mm with only 4 to 7 segments proglottids. The head scolex has numerous hammer-shaped hooks and suckers armed with proglottlna, and numerous hooks. The segments are whitish to translucent.
Davainea proglottina (Davaine, ) – Taxonomy
Only the last one is gravid, i. E ach segment has its own reproductive organs of both sexes i. Each segment has also excretory proglortina known as flame cells protonephridia. The reproductive organs in each segment have a common opening called the genital pore. In young segments all these organs are still rudimentary.
They develop progressively, which increases the size of the segment as it is pushed towards the tail. In Davainea tapeworms o nly the last segment is gravid, i. Protlottina, as other tapeworms, they have neither a digestive tubenor circulatory respiratory systems. They don’t need them because each segment absorbs what it needs directly through its tegument.
The eggs measure about provlottina micrometers, have a capsule and are embryonated, i. Davainea proglottinahas an indirect life cycle with certain birds chicken, turkey, guineafowl, pigeons, etc.
Davaineidae – Wikipedia
The gravid segments of adult tapeworms are shed with the birds’ feces usually one gravid segment per tapeworm per day. The gravid segments are motile and capable of climbing upwards on the vegetation. By mild and humid weather the eggs can remain infective for slugs and snails during several days. The slugs and snails ingest the gravid segments, which release the eggs after digestion. The eggs then develop to cysticercoids in the body cavity of the intermediate hosts.
The birds ingest such contaminated snails or slugs. After digestion, the cysticercoids release the young tapeworms that attach to the gut’s wall. The time between infection and shedding of the first eggs prepatent period is 2 to 3 weeks. Davainea proglottina is highly progloottina for young birds. It is very seldom an issue in modern industrial operations. But in numerous regions in Africa and Asia almost all traditionally kept poultry are more or less infected with this proglottjna or related tapeworms.
Free-ranging poultry are more at risk if they have free access to humid environments with abundant slugs and snails that can be inefected.
Davainea proglottina can attach deeply into intestinal villi. Sudden massive infections can cause hemorrhagic enteritis and intestinal necrosis that xavainea be fatal for the young birds. Chronic infections lead to reduced weight gains, diminished egg production, malnutrition, general weakness and even paralysis. Diagnosis is usually done only after necropsy. It is important to examine a representative sample of the flock and to analyze intestinal smears under the microscope. Gravid segments can be found in the birds’ feces, but not davaineq, i.
Frequent dafainea of the birds’ bedding and keeping it dry can help to avoid infections because it shortens the survival of the eggs and is unattractive for slugs and snails. Free-ranging birds should be kept off humid environments that are supportive of slugs and snails.
Chemical control of the snails and slugs with molluscicides i. It is virtually impossible to treat davaineaa place where they can survive and they reproduce extremely quickly. Cleaned pastures would become re-infested very fast.
In addition it would be also very harmful for the environment. In fact, such molluscicides mainly niclosamide are approved only in a few countries as an aid in the prevention of human schistosomiasis also called bilharziosis or snail fever. There are so far no vaccines against Davainea proglottina.
To learn more about vaccines against parasites of livestock and pets c lick here. Biological control of Davainea proglottina i. You may be interested in an article in this site on medicinal plants against external and internal parasites.
Ask your veterinary doctor! If available, follow more specific national or regional recommendations for Davainea control. Control of Flies Biol. Control of Ticks Biol. Biology, prevention and control.
It is closely related to Raillietina sppanother genus of bird tapeworms. Details Written by P. Also in this site: