| field observations on the epidemiology of abomasal parasites in young sheep during winter and spring. | a flock of spring born lambs was continuously exposed to natural parasite infection from birth until selected for slaughter in groups of two or three, at monthly intervals throughout winter and spring for abomasal worm counts. meteorological data were recorded and regular estimates of infective pasture larval availability were made. parasite population changes and inhibition patterns for ostertagia spp, haemonchus contortus and trichostrongylus axei were recorded. ostertagia spp were found to su ... | 1979 | 262603 |
| observations on the epidemiology of gastrointestinal nematodes of farmed red deer in central southern england. | the epidemiology of the gastrointestinal nematodes of farmed red deer was followed over three years on two farms in north hertfordshire. worm counts on 10 animals (four months to 10 years old) between november and march showed that mixed ostertagid infections were dominant with very small numbers of trichostrongylus axei, cooperia punctata and oesophagostomum species also present in some individuals. an increase in the faecal nematode egg count of the hinds in summer was followed by an increase ... | 1996 | 8883346 |
| worm burdens of dairy heifers in england and wales. | the size and composition of abomasal worm burdens from 143 casualty and cull dairy heifers were estimated. over 60 per cent had totals of less than 10,000, only four exceeded 100,000 and the overall mean was 16,285. ostertagia ostertagi was almost always present and usually formed the major proportion of the total. trichostrongylus axei was recorded in 83 heifers and was the most common species on 17 occasions. the numbers of arrested early fourth stage worms were highest in winter and declined ... | 1981 | 7197843 |
| epidemiology and control of equine strongylosis at newmarket. | seasonal rises in mean faecal egg output were observed in grazing ponies in spring (578 eggs per gram) and in summer (930 epg) on 30 april and 2 september, respectively, in untreated ponies. pasture infectivity reached a peak of 18,486 third stage larvae (l3)/kg on 17 september, two weeks after peak egg counts, coincidental with abundant september rainfall (103.0 mm). differentiation of infective larvae from pasture showed the cyathostomes (small strongyles) to be predominant, but trichostrongyl ... | 1986 | 3803357 |
| prevalence of benzimidazole-resistance in equine cyathostome populations in south east england. | in order to study the prevalence of benzimidazole-resistance in equine cyathostomes, 30 stables in south east england were selected according to strict criteria but with minimum bias to provide three matched groups of 100 horses. one group was treated with fenbendazole, one with pyrantel embonate and the third was left untreated. the overall efficacies of fenbendazole and pyrantel embonate, as judged by the faecal egg-count reduction test, were 56.3 and 95.8 per cent, respectively. the numbers o ... | 1992 | 1595158 |