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ASC305 exam folder > Ruminant nematodes > Flashcards

Ruminant nematodes Flashcards

1
Q

Name a common sheep nematode (common & scientific name), where it resides in the host and draw its lifecycle…

A

Barber’s pole worm (Haemonchus contortus) - abomasum

lifecycle slide 20…

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2
Q

How much do nematode problems cost Vic, SA & Riverina annually?

A

66 million!

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3
Q

Name a common cattle nematode (common & scientific name), where it resides in the host and draw its lifecycle…

A

Ostertagia ostertagi - abomasum

lifecycle slide 23…

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4
Q

Define hypobiosis…

A

arrested stage of development

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5
Q

Name a common horse nematode (common & scientific name), where it resides in the host and draw its lifecycle…

A 
Small strongyles (cyathostomins) - large intestines (adults)
lifecycle slide 28...
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6
Q

Principles of diagnosing nematode burdens…?

A

may have to listen to lecture…

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7
Q

Define WHP…

A

Witholding period - minimum period of time that must elapse BETWEEN LAST ADMINISTRATION OR APPLICATION of vet chemical product & treated feed & SLAUGHTER OR USE FOR HUMAN CONSUMPTION

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8
Q

Define ESI…

A

Export slaughter interval - the time which should elapse between administration of a veterinary chemical to animals and their slaughter for export.

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9
Q

Name 3 broad spectrum anthelmintics…

A

Benzimidazoles (‘white’ drenches)
Levamisole (‘clear’ drenches)
Macrocyclic lactones (IVERMECTIN etc.)

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10
Q

Name 3 narrow-spectrum sheep anthelmintics & state what they treat…

A

closantel - barber’s pole
Triclabendazole - Fasciola hepatica (liver fluke)
praziquantel - cestodes

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11
Q

Discuss the factors that lead to selection for anthelmintic resistance…

A

Fecal Egg Count Reduction Test (FECRT)
Worm egg count (WEC) & find young animals to test
treat some & not others (control)
resample & WEC/larval diff within PPP
check reduction in WEC = drench efficiency

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12
Q

Principles of diagnosis of nematode burdens…

A

fecal sample egg counts
larval culture & differentiation
morphological ID - microscopy
fecal flotation technique

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13
Q

How would you monitor success in reducing anthelmintic resistance?

A

DrenchCheck day 10:
WEC & larval culture pre-treatment
WEC & larval culture 10 - 14 days after treatment

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14
Q

Major anthelmintic groups for sheep and current resistance levels for these groups… (Benzimidazoles ‘white’ drenches)

A

More than 90% of farms with resistant worms

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15
Q

Major anthelmintic groups for sheep and current resistance levels for these groups… Clear (levamisole) drenches

A

More than 90% of farms with resistant worms

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16
Q

Major anthelmintic groups for sheep and current resistance levels for these groups… BZ/lev combination drenches

A

More than 60% of farms with resistant worms

17
Q

Major anthelmintic groups for sheep and current resistance levels for these groups… Closantel

A

Definite resistance in barber’s pole worm

ASC305 exam folder (7 decks)

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