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External Parasites Biting insects that suck blood Vectors of encephalomyelitis ____ _____ hatches into maggots which feed on dead tissue Flies Lifecycle.

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Presentation on theme: "External Parasites Biting insects that suck blood Vectors of encephalomyelitis ____ _____ hatches into maggots which feed on dead tissue Flies Lifecycle."— Presentation transcript:

1 External Parasites Biting insects that suck blood Vectors of encephalomyelitis ____ _____ hatches into maggots which feed on dead tissue Flies Lifecycle stages are: egg, larva, pupa, adult Best way to control is to remove manure and decaying vegetable material Lice There are both biting and sucking kind Attach eggs, called nits, to the hair, close to skin Eggs hatch in days Can only exist about 3 days when off the host animal Females lay eggs days of age Treat by spraying, sponging or dusting and repeat in 2-3 weeks Mites Cause mange So small must be viewed under microscope Chorioptic type may cause foot mange resembling scratches Eggs hatch in 3-10 days Females lay 10 to 25 eggs during laying period which lasts days Dust is not effective, must spray or use a wet brush wash, repeat every 7 days Ticks Cause piroplasmosis The _____ ________ caused African horse fever Lifecycle stages are: egg, 6 legged larva or seed tick, 8 legged nymph, adult Breathe by spiracles or holes on their abdomen Treat by dipping entire animals Caused by various species of fungi, arranged in circles on the skin Causes severe itching, infection may lead to abscesses Lesions are usually covered with grayish crusts The disease this parasite causes can be spread to children Treat with warm soap and water to soften crusts, paint with tincture of iodine daily for 1 – 2 weeks Ringworm

2 External Parasites Flies Lice Mites Ticks Ringworm

3 Internal Parasites Lays yellow eggs on legs, chest, belly and neck. Also chin, throat, nostrils and lips. Horse licks or bites stimulating hatching of eggs Bot Fly Larvae burrow into the tongue and travel to the stomach Mature in stomach in 9 months Ascarids (Roundworms) Primarily affects young horses Swallowing eggs in feed, pasture and water infects young horse Larvae migrate to small intestine, liver and lung tissue Measure 5 to 22 inches in length Cause digestive problems, intestinal and blood vessel blockage, colic and possibly death Lifecycle is about 3 months Strongyles (Bloodworms) Unthriftiness, pot belly, rough coat, lack of growth and cough are signs of infestation Most common form of equine internal parasites Found in large intestine Larvae climb to upper portions of pasture grasses and are swallowed by horses grazing Lays several thousand eggs per day Infests young foals that ingest larvae in the dams milk or by larvae in bedding Larvae migrate through lungs and small intestine Foals become dehydrated and developer chronic diarrhea Seen in feces of affected horses White-appearing worms with long slender tails Stronglyoides (Threadworms) Mature larvae burrow into the ground, turn into pupa and in days they emerge to begin the cycle again Active from early spring to first freeze Treated with anthelmintic Cycle must be broken by killing the flies, egg removal or deworming Female worms lay up to 200,000 eggs per day Deworm foals every two months for 1 st year to prevent Large strongyle larvae migrate into arties and cause blood clots Small strongyles migrate thru liver and large intestine causing diarrhea and colic Worms mature in large intestines and females full of eggs travel to small colon, rectum and crawl out anus Causes horse to rub tail against posts, this crushes the adult but leaves eggs glued to anal region Pinworm

4 Internal Parasites Bot Fly Ascarids (Roundworms) Strongyles (Bloodworms) Stronglyoides (Threadworms) Pinworm


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