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External Parasites, Mites: arachnids (Burrowing: Demodex spp. (demodicosis…
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Mites: arachnids
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Non burrowing mites
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feed on scale, hair, and tissue fluids
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NB: Psoroptes spp.
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US strains in sheep have been eradicated, bovine strain is less significant due to new drugs
NB: Chorioptes bovis
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may see crusting, pruritis, alopecia
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Lice: insect
Mallophaga
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species
bovicula spp
horses, cattle, sheep, goats, camelids
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Anoplura
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species
hematopinus spp
pigs, horses, cattle, camelids
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Flies: insect
Melophagus ovinus
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cause significant damage, reduce value of fleece, pain and irritation from biting
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Hypoderma spp
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damage to the host
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severe inflammatory reactions, bloat, paralysis if larvae die while along esophagus or spinal cord
Biting flies
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cause irritation, allergic dermatitis, toxemia/death in large fly strikes
parasitic phases
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Larvae
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instar stages instead of L1, L2..
myiasis
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Maggots
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feed on necrotic tissue, hair stained with blood, urine, or feces
bots
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barrel shaped, rows of spines on body
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Ticks: Arachnids
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Tick life cycle
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nymph
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similar to adult, lacks functional repro system
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blood feeders, can lead to anemia
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