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
model life cycle
Trichostrongyloid , trichostrongyle, strongyloid, strongyle
PPP
21 days
clinical signs for type 1 disease
Summer Ostertagiosis
– In calves during first grazing season
– Profuse watery diarrhea
– Morbidity high
clinical signs for type II disease
Winter Ostertagiosis
– In calves following first grazing season with arrested L4
– Profuse watery diarrhea
– More “bottle jaw”
– Clinical disease low, mortality high unless treatment instituted
diagnosis
culture and identification of L3
fecal egg counts
Plasma pepsinogen levels elevated
% adults to larvae high in _____ and low in____
Type 1, Type II
treatment and prevention for type 1
Responds well to anthelmintics
move cattle
treatment and prevention for type II
Requires anthelmintics
effective against arrested L4, larvae and adults
to prevent create a ____ pasture
safe
