studies on parasitic worms of sheep in scotland. i. embryonic and larval development of haemonchus contortus at constant conditions. 195913657514
sheep helminth parasitic disease in south eastern scotland arising as a possible consequence of climate change.the climate in the uk is changing, with a trend towards increased rainfall in the autumn and winter and warmer average temperatures throughout the year. there has also been a 4-week extension of the herbage growing season over the past 40 years. these changes may have implications for the epidemiology of sheep helminth parasites. here, we describe production-limiting disease outbreaks caused by haemonchus contortus, nematodirus battus, teladorsagia circumcincta and fasciola hepatica in sheep flo ...200919556065
back to the future: developing hypotheses on the effects of climate change on ovine parasitic gastroenteritis from historical data.although the influence of temperature and moisture on the free-living stages of gastrointestinal nematodes has been described in detail, and evidence for global climate change is mounting, serious attempts to relate altered incidence or seasonal patterns of disease to climate change are lacking. in great britain, veterinary surveillance laboratory diagnoses of ovine parasitic gastroenteritis (pge) have been categorised in species groups and recorded since 1975. here we present a detailed analysi ...200818824303
haemonchosis and teladorsagiosis in a scottish sheep flock putatively associated with the overwintering of hypobiotic fourth stage larvae.the cause of ill thrift and deaths was investigated in a group of 40 scottish lowground ewes, which had been treated with levamisole and then turned onto clean grazing after lambing, 6-8 weeks previously. concurrent haemonchosis and teladorsagiosis were diagnosed, putatively associated with the spring maturation of large numbers of hypobiotic larvae. ill thrift due to parasitic gastroenteritis consequently occurred in the lambs which had been turned onto the 'clean' grazing with their dams, desp ...200717531390
effect of anthelmintic treatment strategy on strongylid nematode species composition in grazing lambs in scotland.refugia based anthelmintic protocols aim to reduce the rate of development of anthelmintic resistance in gastrointestinal nematodes (gin). previous studies have illustrated the impact of different drenching regimes on drug efficacy and animal growth; however, the impact on nematode populations has yet to be characterised within natural infections. this study investigated the changes in species composition of gin throughout the grazing season, following implementation of four different ivermectin ...201627067011
a survey of the trichostrongylid nematode species present on uk sheep farms and associated anthelmintic control practices.a survey of sheep farms from across the uk was conducted to establish information on farming practices, the trichostrongylid nematode species present and anthelmintic usage. questionnaires and faecal samples were returned from 118 farms. first stage larvae (l(1)) were cultured from faecal samples and used for pcr analysis to determine the presence/absence of selected trichostrongylid species. teladorsagia circumcincta was the only species present on 100% of farms. haemonchus contortus was found ...201222560313
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