The research was performed at the Faculty of Veterinary Medicine of the Latvia University of Agriculture. At the moment the research in veterinary anaesthesia is in its infancy stage. The aim of this study was to determine the effects of the acepromazine maleate on intraocular pressure (IOP) and horizontal pupil diameter (HPD) in a dog's eye. Ten adult dogs of different age, breed and sex were examined clinically and ophthalmologically. All animals were clinically and ophthalmologically healthy. Animals received acepromazine intramuscularly. IOP and HPD were measured every 5 minutes for the total period of 60 minutes. It was established that the acepromazine maleate intramuscular injection causes an IOP decrease in booth eyes. A significant IOP decrease was observed from 35 till 60 minutes after the acepromazine injection. The pupil contraction was observed 5 minutes after the treatment and continued to contract till the end of the research. As acepromazine maleate causes a significant decrease of intraocular pressure, it is not contraindicated to be used in the case of corneal trauma, perforation, glaucoma and corneal ulcers.

However, the last case of tuberculosis to cattle was registered in Estonia in 1986, rapid and accurate diagnosting of the disease is still an actual veterinary problem. On farms, tuberculin testing has been regularly carried out showing that tuberculin positive cattle constitute 5,47% from all the herd. During 1997-2001, 23 clinical samples were isolated from the tuberculin positive cattle. Each sample was analysed with conventional morphological and bacteriological methods and by PCR. None of eleven mycobacterial cultures, isolated from the lymph modes of cattle, belonged to M. tuberculosis complex. There were seven cultures identified as M. avium and one as M. avium complex (MAC). The research confirmed that M. avium is the most frequently isolated bacteria causing NTM-Mycobacterioses in cattle in Estonia (63,6%). Two cultures of MAC were isolated from the milk of tuberculin-positive cows, verifying that milk can be a potential source of MAC transmission to man.

Describes a purification method for the Bunchy top virus based on density gradient centrifugation which allowed observation of the virus particles for the first time. Thirty micrograms of virus were obtained from 200g of infected leaves. To obtain large amounts of virus for antisera preparation the purification procedure has to be improved