Document Detail

Excretion of Eimeria alabamensis oocysts in grazing calves and young stock.
MedLine Citation:
PMID:  10763379     Owner:  NLM     Status:  MEDLINE    
The aims of the present study were to investigate the excretion of Eimeria alabamensis oocysts by young cattle during their first grazing season and during the first 16 days of their second grazing period. In trial 1, nine first-season grazing heifers were studied and found to have become infected with E. alabamensis shortly after turnout. The next grazing period they were turned out on to a permanent pasture together with two first-season grazing calves. Faecal samples were collected before turnout and then daily from day 3 to day 16. The second-season grazing heifers excreted insignificant numbers of E. alabamensis oocysts, whereas one of the two first-season grazing calves excreted up to 703,000 oocysts/g of faeces (OPG), indicating that the pasture was contaminated. In trial 2, faecal samples were collected from 12 calves before their first turnout in May, daily from day 2 to day 20 after turnout and then once a week until the end of September. The calves grazed pastures used in previous years by first-season grazing calves. Nine of the calves developed clinical E. alabamensis coccidiosis 4-7 days after turnout and excreted more than 950,000 OPG on days 9-10. By day 17 the oocyst excretion had decreased below 900 OPG and remained low throughout the rest of the grazing season. The results of the two studies indicate that reinfections with E. alabamensis are of little clinical importance in calves grazing contaminated pastures, and that young stock infected with E. alabamensis during their first grazing season may be used to cleanse contaminated pastures without risk of developing clinical coccidiosis.
C Svensson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of veterinary medicine. B, Infectious diseases and veterinary public health     Volume:  47     ISSN:  0931-1793     ISO Abbreviation:  J. Vet. Med. B Infect. Dis. Vet. Public Health     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-05-16     Completed Date:  2000-05-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100955260     Medline TA:  J Vet Med B Infect Dis Vet Public Health     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  105-10     Citation Subset:  IM    
Department of Animal Environment and Health, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Skara, Sweden.
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MeSH Terms
Cattle Diseases / immunology,  parasitology*
Coccidiosis / immunology,  parasitology,  veterinary*
Eimeria / isolation & purification*
Feces / parasitology*
Parasite Egg Count / veterinary

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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