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Parasitology > Ruminant Lecture > Flashcards

Ruminant Lecture Flashcards

1
Q

What’s the most important of the trichostrongyles (HOTC worms) worldwide

A

Ostertagia ostertagi

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2
Q

Can nematode parasites reduce milk production

A

Yes

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3
Q

Habitat of trichostronglyes

A

Abomasum and small intestine of ruminants

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4
Q

What is a family of parasites that are small bursate nematodes found mostly in herbivores

A

Trichostrongyles

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5
Q

HOTC complex acronym

A

Haemonchus spp
Ostertagia spp
Trichostrongylus spp
Cooperia spp

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6
Q

Life cycle of trichostrongyles

A

Direct and short

Eggs in poo
L hatch
L3 are ingested
L3 travel to abomasum or small intestine and develop into adults

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7
Q

Bottle jaw

  • seen with
  • reasoning
A

Seen with Haemonchus and Osteragia spp
Due to blood feeding tendency of species, there’s loss of protein in diet and movement of fluid outside of blood vasculature system.

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8
Q

Ostertagia spp larva

  • mechanism
  • north vs south
  • dependent on
A

Can go into arrested development. (inhibition prone)

Occurs in north during winter (larvae will emerge in early spring)

Occurs in south during summer (larvae will emerge in early fall)

Dependent on photoperiod and temperature (pretty much environment)

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9
Q

Expense factor for host during arrested development-Ostertagia

A

Lesions are formed within abomasum during arrested development expand gastric gland pits. Worms irritate glands and cells that release HCl are destroyed and pH is raised. Get green diarrhea because digestive proteins aren’t working.

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10
Q

Morroco leather

A

Studded appearance inside abomasum

Type II ostertagiasis

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11
Q

Purpose of inhibition

A

Survival

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12
Q

Type I osteragiasis

  • inhibition
  • north vs south
A

Inhibition is not present

Occurs during first summer on pasture for animal

  • North:July-Oct
  • South: anytime of year
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13
Q

Type II ostertagiasis

  • inhibition
  • north vs south
A

Inhibition is present
After first grazing season

North:Late winter/early spring (warm weather)
South: Late summer/early fall (cooler weather)

Survival is dependent on temperature

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14
Q

Pre patent period of O.ostertagi

A

3 wks

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15
Q

Increase of eggs/gram can conclude that

-O. ostertagi

A

Decrease in wt of animal

Increase in plasma pepsinogen

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16
Q

If calf in north died in summer at 8 mo after being on pasture for 4 mo, 2+noduleswhat did it probs die of?

A

Type I ostertagiasis

17
Q

If calf in north died in Oct at 10 months after being on pasture 5 mo, 1+ nodule what did it probs die of?

A

Pre-type II ostertagiasis

18
Q

If calf in north died in Mar at 2 yrs old and had 4+ nodules, what did it probs die of?

A

Type II Ostertagiasis

19
Q

What would you see in KY with osteragiasis?

A

You would see both north acting larvae and south acting larvae

Parasitology (6 decks)

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