studies on nematode infections of beef cattle in new south wales.the occurrence and seasonal trends of nematode parasite infections in beef cattle on the tablelands and north coast regions of new south wales are described, based on worm counts from 627 spring-born steers slaughtered at 2-monthly intervals from 6 to 24 months of age. the predominant parasites were ostertagia ostertagi, trichostrongylus axei and cooperia spp. large burdens of adult ostertagia were seen in 12-month-old animals in late winter and early spring, and later in 18- to 20-month-old cat ...1977614021
abundance and survival of infective larvae of the cattle nematodes cooperia punctata, haemonchus placei and oesophagostomum radiatum from faecal pats in a wet tropical climate.observations were made on the abundance and survival of haemonchus placei, cooperia punctata and oesophagostomum radiatum infective larvae from cattle faecal pats exposed at various times of the year in north queensland wet tropics. pats exposed in the hot, wet season yielded abundant larvae on herbage. in the dry season, although low numbers of infective larvae were usual, considerable numbers were produced under conditions of heavy dews on dense herbage. irrespective of season of deposition of ...19883190586
factors affecting the survival and migration of the free-living stages of gastrointestinal nematode parasites of cattle in central queensland.faecal pats containing parasitic nematode eggs were deposited monthly on worm-free pasture, from mid-1975 to early in 1979, near rockhampton in central queensland. pasture samples were collected monthly from beside these pats and the number of infective larvae on the samples was counted. cooperia spp. were the most numerous larvae on pasture all year round and haemonchus placei were commonly present in low numbers. small numbers of oesophagostomum radiatum larvae were found, mostly during summer ...19892728322
inhibited development of trichostrongylid worms in grazing cattle.inhibition of development of gastro-intestinal trichostrongylid worms was studied using successive groups of tracer calves and groups of continuously grazed calves over one year in the tully area of north queensland lowland wet tropics. the results, assessed by means of worms from these calves recovered at necropsy 3 weeks after their removal from pastures, showed inhibition in the development of haemonchus placei and cooperia punctata at the early fourth stage at the approach to and during the ...19892590137
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