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The aim of the study was to estimate the extensiveness and intensity of Hippobosca equina in primitive Polish horses. Studies were carried out on 13 mares, 10 sucking colts as well as 15 mares and 10 stallions at 1.5-2 years of age from July 25-30, 2005. The presence of H. equina was found in all animals, but the number of insects depended on the horses age and sex. The extensiveness (E.i) and intensity (I.i) of invasion fluctuated between 23-38.5% 0.6-2.2 in mares, 10-30% and 1.0 in sucking colts, while in 1.5-2 year-old mares and stallions E.i. and I.i. it was 40-80%, 2.1-9 53.3-86.7% and 3.8-6.5 respectively. A certain level of anxiety, which manifested in intensive tail lashing and frequent scraping of posts or tree trunks, was observed in the animals despite the minor level of intensity in the invasion which did not exceed 9 insects per animal. Skin Inflammations were also noted, especially in mares, which were unrelated to the amount of parasites existing in the anus and pudendum lips. The lack of interest in H. equina invasions in horses on the part of veterinary surgeons is probably due to difficulties in actually diagnosing them, since this insect exists in places which are invisible and difficult to examine in grazing animals.
One problem underestimated by veterinarians and farmers in horses is diptera Hippobosca equina, a blood-sucking insect that annoys horses and causes skin injuries. The aim of the presented studies was to estimate the extensiveness and intensity of Hippobosca equina invasion in primitive Polish horses during the grazing period. Studies were carried out from July to October on 15 mares, 10 sucking foals, as well as on 15 young stallions and 13 young mares. Insects were counted in all animals once in mid June, then daily from July 24 to 29, next on August 16, September 20 and October 25. In July the presence of Hippobosca equina was not found in mares and sucking foals, but in young horses the invasion occurred in more than 53% of stallions and about 76% of mares. Daily examinations in July showed the presence of diptera in all groups, but not in all animals. The maximum invasion extensiveness in mares (80%) occurred July 28, while in foals July 26 (90%) and August 16 (70%). In 1.5-year-old mares and stallions H. equina occurred in July and lasted up to September. The greatest number of insects (up to 11) was found July 29 in one stallion and July 25, 27 and 29 in mares (up to 29). The extensiveness of invasion in young stallions in the early part of the summer fluctuated between 53.3% (June) and 93.3% (July 27) and decreased in September to about 27%, while in young mares it was more than 92% in July and August and 30.8% in September. Hippobosca. equina did not occur in October in 1.5-year-old horses.
The present paper focuses on three species belonging to the family Hippoboscidae: Hippobosca equina, Lipoptena cervi and L. fortisetosa – haematophagus ectoparasites typical of cervids. In Europe, the forest flies (H. equina) are observed mainly in horses and cattle, but the primary host of this parasite is the red deer (Cervus elaphus). The host group of deer keds Lipoptena sp. include different ruminant species belonging to Cervidae (moose, red deer, sika deer, fallow deer, roe deer and maral) and Bovidae family (mouflon, european bison, cattle, sheep and goat). Furthermore, some species of carnivores (European badger, dog and red fox) can be accidental hosts. The presence of adult hippoboscid flies in the environment shows strong seasonality. One or two generations of H. equina occurs from May to October. The alate forms of univoltine Lipoptena cervi and probably multivoltine L. fortisetosa appear from August to September, and from June to September, respectively. During warm autumns, both species can be observed in late October, or even November. Hippobosca equina and Lipoptena cervi are native species, unlike the foreign L. fortisetosa. This Asian species was noted in Europe for the first time in the 1960s, and has rapidly spread in numerous countries. The most probable way of L. fortisetosa introduction to Europe was translocation via host (probably sika deer), or natural dispersion throughout Eurasia. Therefore L. fortisetosa should be treated as an alien invasive species in Poland and Europe. Interest in these three neglected dipteran species has increased after reports of their veterinary and medical importance. All these parasite species are able to attack humans. Bites of these insects are considered painful, cause skin lesions with the presence of characteristic persistent pruritic papules, and, in extreme cases, may result in an anaphylactic reaction. Hippoboscids can play a role in the transmission of bacterial pathogens, including Anaplasma and Bartonella genera, dangerous for humans and animals. Permanent and intensive attacks on humans, during the seasonal mass occurrence of these parasites, can hinder forestry work, as well as harvesting, recreation, and hunting activities in forested areas.
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