Exam III - Oestrus ovis Flashcards

1
Q

who is the host for Oestrus ovis & what is its common name?

A

sheep & goats +/- humans

nasal bot fly

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2
Q

Oestrus ovis female fly will deliver 25 larva into the nares of sheep with a “squirt” of fluid during flight. larva will remain in the nostral of sheep for 2wks(summer) to 9months(winter). during this time the sheep will secrete a lot of mucus from its nose. why?

what happens to the larva after this time period?

A

the larva cause irritation of the nasl mucosa from their venteral spines and oral hooks.

after maturation 2wks-9 months the larva drop out of the sheep and pupate on the ground.

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3
Q

what are the behavioral CS’s seen by sheep to avoid attacks from Oestrus ovis?

A

pressing there nose to the ground, hiding there head between other sheep, panicing and stomping of feet.

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4
Q

What is the result of sheep that spend a lot of there time avoiding attacks from Oestrus ovis and not grazing?

A

wt loss = decrease production yield.

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5
Q

If a human becomes the target of Oestrus ovis and becomes infested with the larva what is the result?

A

Oestrus ovis larva never fully develop in humans but are commonly laid on the eye & lips.

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6
Q

what is one of the Tx strategies for Oestrus ovis in sheep?

A

tx with MCL’s at the beginning of summer to kill newly aquired larva and again in midwinter to kill overwinter larva.

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7
Q

the adult fly is gray and can be up to 1cm long. How long can the mature larva get?

A

up to 3cm

yellow with dark transverse bands

1 inch = 2.4cm

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8
Q
A
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