Inhibited development of Ostertagia ostertagi in relation to production systems for cattle
| Autor: | M. G. Smeal, A. D. Donald |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
geography
Larva geography.geographical_feature_category Ostertagia ostertagi Trichostrongyloidea Australia Cattle Diseases Beef cattle Animal husbandry Biology Poaceae Pasture Trichostrongyloidiasis Infectious Diseases Animal science Ostertagiasis Animals Cattle Animal Science and Zoology Parasitology Seasons Animal Husbandry Dairy cattle Production system |
| Zdroj: | Parasitology. 85:21-25 |
| ISSN: | 1469-8161 0031-1820 |
| Popis: | SUMMARYOn a coastal farm in New South Wales where beef and dairy cattle production was carried on side-by-side, separate pasture plots were contaminated with eggs of Ostertagia ostertagi by calves from each production system in autumn, winter or spring. Successive groups of parasite-free tracer calves grazed on the plots for 14 days at 4-week intervals and were then killed for worm counts 14 days after removal from pasture. On all plots, the proportion of inhibited early 4th-stage larvae in tracer calves reached a maximum in spring, and was consistently and very significantly higher in calves which grazed plots contaminated with O. ostertagi of beef cattle origin. Factors which may be responsible for this difference between beef and dairy cattle populations of O. ostertagi are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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