Ostertagia ostertagi Flashcards
class
nematoda
order
strongylida
common name
brown stomach worm
hosts
cattle
ostertagia is important in _____ regions with winter rainfall
temperate and subtropical
adult characteristics
slender
reddish brown
size of adult
1cm
larvae are _____
microscopic
species differentiation based on _____
spicules in males
vulva in females
egg characteristics
trichostrongyloid
oval
85micrometers
thin shelled
life cycle direct or indirect?
direct
life cycle
eggs pass in feces develop to L3 L3 migrate to herbage ingested by cow during grazing L3 develops in abomassal gland 2 molts occur adult emerges from the gland male and females mate females lay eggs
if conditions are not favorable the ____ will arrest inside the host for up to 6 months
L4
site of infection
abomasum
pathogenesis
Caused primarily by L3 to immature adult in the gastric glands
Thickened gastric mucosa; raised nodules = “Moroccan leather”
Increased plasma pepsinogen