Epidemiological study of parasite infection in a cow-calf beef herd in Quebec.
Vet Parasitol
; 42(3-4): 281-93, 1992 May.
Article
in En
| MEDLINE
| ID: mdl-1496788
ABSTRACT
The patterns of gastrointestinal and pulmonary nematode infections in a previously untreated Aberdeen Angus cow-calf herd were observed between May 1988 and December 1990. The cow-calf herd and replacement heifers were on separate pastures. The relatively high mean faecal egg counts of cows and heifers at the time of turnout were mainly owing to the maturation of hypobiotic worms. The strongyle egg counts of calves began to rise soon after turnout onto pasture and reached peak levels at the end of the grazing season. The number of infective larvae on pasture was highest during September/October. Ostertagia, Cooperia and Nematodirus were the most prevalent genera found at necropsy and on pasture. Larvae of these nematodes were able to overwinter on pasture and Ostertagia larvae, additionally, were able to overwinter in the host as arrested early fourth stage larvae. The high egg output of cows at the time of turnout may serve as a source of infection for their calves and be responsible for the late-season rise in pasture larval counts.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cattle Diseases
/
Intestinal Diseases, Parasitic
/
Lung Diseases, Parasitic
/
Nematode Infections
Type of study:
Prevalence_studies
/
Risk_factors_studies
Limits:
Animals
Country/Region as subject:
America do norte
Language:
En
Journal:
Vet Parasitol
Year:
1992
Type:
Article
Affiliation country:
Canada