Features of the exogenic development of Passalurus ambiguus (Nematoda, Oxyuroidae) at different temperature regimes

Passalurosis is a prevalent disease among helminthiases of domestic rabbits. This invasion caused by the nematode Passalurus ambiguus (Nematoda, Oxyuroidae), which cosmopolitan and localized in cecum colon highly contagious capable unlimited spread, due to biological characteristics its pathogen, such as conditions that ensure maximum preservation parasites at exogenous stages their development. Experimental research laboratory established timing development P. eggs isolated from gonads female helminths, depending on temperature regimes features growth According morphological eggs, four were distinguished development: zygote, cleavage formation blastomeres, larvae motile larvae. Depending cultivation temperature, duration embryogenesis ranged 4 9 days, egg viability 59.3% 72.7%. The most favourable regime for was 35 °C, 72.7% with formed within days. At this zygote stage lasted 1 day cultivation, cleaving blastomeres occurred days 1–2, larval 1–3, larva 3–4. lower temperatures, term increased, number viable decreased. temperatures 30 °С 25 °С, took place during 5 7 respectively, 66.7% 62.7%. these 1–2 1–3 1–4, 2–4 2–6, 3–5 4–7, respectively. least 20 only 59.3%. 1–4 blastomere 3–8, happened 5–9. accompanied significant changes morphometric parameters, increase width thinning shell plug. obtained data will allow preventive measures be effectively implemented rabbit farms are susceptible pinworms, taking into account terms pathogens different seasons.