Development and survival of infective larvae of gastrointestinal nematodes of cattle on pasture in central Kenya |
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Authors: | Waruiru RM Munyua WK Thamsborg SM Nansen P Bøgh HO Gathuma JM |
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Institution: | (1) Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, University of Nairobi, PO Box 29053, Nairobi, Kenya;(2) Department of Public Health, Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Nairobi, PO Box 29053, Nairobi, Kenya;(3) Danish Centre for Experimental Parasitology, Department of Veterinary Microbiology, Royal Veterinary and Agricultural University, Bulowsvej, DK-1870, Frederiksberg C, Denmark |
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Abstract: | On a series of pasture plots, 2 kg pats of bovine faeces containing known numbers of strongylid (Haemonchus, Cooperia, Oesophagostomum and Trichostrongylus) eggs were deposited at intervals of 4 weeks from July 1995 to June 1996. The plots were sampled every 2 weeks after contamination and infective larvae were identified and counted. Larvae of all the genera developed throughout the year, but the pats exposed during the rainy season yielded more abundant larvae on the herbage. Irrespective of the season of deposition of the pats, larvae were found in larger numbers from 2 to 6 weeks after deposition and generally declined to below detectable levels within 12 to 16 weeks of contamination. The comparatively short survival times noted in this experiment may present opportunities for manipulation of the population dynamics of the gastrointestinal nematodes in the tropical environment of Kenya. |
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Keywords: | bovine climate eggs infective larvae Oesophagostomum season trichostrongyle |
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