[Role of flies in the epizootiology of coccidiosis in poultry].

The possibility is shown Musca domestica L. to ingest considerable amounts of oocysts of Eimeria tenella which remain in their digestive tract during 120 hrs. Both sporulated and non-sporulated oocysts remain viable and infectable.

[Trials in the therapy and prevention of sheep nose bots].

Comparative experiments were carried out on the effectiveness of some antiparasitic agents for the treatment and prophylaxis of estrosis in sheep. An evaluation is made of all methods applied in the modern technologies of sheep raising. It was found that the method of fumigation of airtight premises using negouvon at the rate of 0.

[Residual action of Neguvon, Neocidol, Nuvanol and Dursban on the imaginal and larval stages of the housefly].

It is shown that Dursban, Neocydol and Neguvon preparations, mixed with swine manure at amounts of 500 mg/kg, kill 100 per cent the larvae of the domestic fly up to the 30th, 20th and 10th day, respectively, while the Neguvon and Neocydol preparations in cattle manure, up to the 10th day. Lower concentrations possess a residual effect of a shorter duration. It is also shown that the type of the surfaces and the pH of the mater on which the preparations are placed markedly affect the inctesicide activity and the residual effect of the preparations.

[Role of the housefly in the epizootology of pseudoplague in birds].

It has been demonstrated that Musca domestica L. could harbour the Newcastle disease virus. It has been isolated from the surface of the flies body 96 hours after these had been in contact with it, and from their digestive tract--after 240 hours.

[Spread and economic importance of acariasis in swine].

Studies were carried out on the aspects of the epizootic process and the economic importance of acariasis in swine. It was established that the disease had widely spread. About 92 per cent of the pig-breeding farms proved infected, in which an average of 30.

[Distribution, species composition and seasonal dynamics of ticks of the Ixodidate family in northwest Bulgaria].

It has been established that a total of 7 species of Ixodes ticks parasitize in farm animals in the northwest region of the country. The prevailing species is Rh. bursa, which constitutes 67.