Open AccessREGULARITIES OF LARVAE SURVIVAL OF Oestrus ovis L. IN THE HOST BODY
Author(s) -
Marchenko
Publication year - 2020
Publication title -
theory and practice of parasitic disease control
Language(s) - English
DOI - 10.31016/978-5-9902341-5-4.2020.21.217-222
Subject(s) - larva , biology , oestrus ovis , parasite hosting , host (biology) , abundance (ecology) , zoology , ovis , reproduction , veterinary medicine , myiasis , ecology , medicine , world wide web , computer science
Experiments with artificial invasion of sheep by larvae (Oestrus ovis L.) and experiments with surgical replacing of older gadfly larvae were conducted. Survival of larvae upon infection of 40 specimens higher (22.5%) than with infection of 20 and 80 specimens (10 and 11.2%), respectively. High percentage of death of larvae of II and III ages (63.7 and 58.4%) was found in the experimental replacing of larvae. It was shown that the natural resistance of larvae to adverse environmental factors increases with increasing age of the larvae. The hypothesis of a self-regulating level of sheep gadfly abundance in the parasitic system is discussed. The optimum abundance, which is characterized by the maximum survival and abundance of the parasite and is within 40 specimens based on the result of spontaneous infection, is considered. This level of infection allows maintaining a high reproductive potential of the parasite with a minimum of negative effects on the host.