The article deals with physiological make-up of the service dogs, influencing their use in Border Service Authorities of the Republic of Belarus». Disputable issues on physiological make-up of the service dogs during vehicles inspection at border crossing points of the Republic of Belarus are analyzed. The ways of their solving in the field of border crossing points functioning through the State Border of the Republic of Belarus and arrangement of cynoligist service and officers training are suggested.

Icrosporidies (14 species), coelomycidies (12), mermitids (7) and mites (3) cause diseases of blood-sucking black flies in the streams of the Central non-blackearth zone of Russia. Mermitids regulate the number of black flies mainly in pure streams, microsporidies and coelomycidies - in polluted ones. Water mites do not play a decisive role in reducing the number of black flies, compared with other parasites.

From FLK-BLV, the sera, lymph nodes of leukemic cows and blood of the person sick with sarcoma filtered through the sterilizing filters (0.22 µm) it was succeeded isolated the identical cultures of cell wall deficient mycobacteria that allows to assume that what is considered a bovine leukemia virus may be virus-like form of mycobacteria tuberculosis.

The analysis of the seasonal dynamics of the number of Apodemus (Sylvaemus) flavicollis Melchior 1834 in undeveloped parts of the Minsk has been carried out. The age structure of the Ap. (Sylvaemus) flavicollis population in different seasons of the year was revealed. The main changes in helminths invasion from the age of the host Ap. (Sylvaemus) flavicollis have been established.

The article reflects the main morphological, morphometric and histochemical indices of the liver in connection with the physiological processes occurring in adult lab rats, and also established the level of toxicity of the anthelmintic drug «Triclafen» suspension.

The article presents the results of a study of the pharmacokinetic parameters of the distribution of L-arginine on the organism of chickens after feeding. The data on the content of amino acids in the blood plasma and tissue samples of the liver, kidneys, lungs, heart, fabric pouch, pectoral muscle were given.

The article presents data on the design of «Multiplex PCR Pasteurella multocida (A, B, D)», a description of the genes encoding factors of the pathogenicity of Pasteurella multocida serovariants A, B, D. The specificity and sensitivity of multiplex PCR test systems are determine

The article presents a review of the literature devoted to the problem of the content of somatic cells in the milk of cows. It was shown that with an increase in the number of somatic cells in milk, its composition and physicochemical properties change. These changes in turn lead to the deterioration of its technological properties, reducing the quality characteristics of milk and finished products

The article presents data on the determination of bactericidal activity and effectiveness of a new antimastitis preparation «Mastin». The experience of determination of bactericidal activity of veterinary Mastin preparation is described. As the test cultures were selected, KMIEV strains: Staphylococcus aureus, Streptococcus epidermidis, Escherichia coli. It was found that Mastin effectively inhibits the growth of staphylococci, streptococci and E. coli. The article presents data on the establishment of the effectiveness of the new drug. Preparation veterinary «Mastin», is an effective drug (85.5±0.5%) in the treatment of cows with subclinical and clinical mastitis and can be recommended for wide practical application.

The article presents data on pharmaco-toxicological characterization of a new drug based on bacteriophages «Endometrofag». The article describes the experience in determining the acute toxicity of the drug, the local irritant effect of the drug on the skin, the irritant effect of the drug on the mucous membranes, sensitizing (allergenic) ability, embryotoxic and teratogenic effects of the drug on laboratory animals. In the parameters of acute toxicity according to the classification GOST 12.1.007 the drug based on bacteriophages «Endometrofag» refers to the IV class of hazard (low hazard substances) with an LD50 of over 5000 mg/kg. It was found that the drug used in a rats in different periods of pregnancy does not cause pathological changes during pregnancy in rats, as well as deviations in the development of offspring, deformities, which indicates the absence of embryotoxic and teratogenic properties.

He article presents data on the infection of introduced fish by invasive species of bacteria (Shewanella putrefaciens and Aeromonаs hydrophila) and helminths (Khawia sinensis (Hsü, 1935), Bothriocephalus acheilognathi (Yamaguti, 1934), Philometroides lusiana (Vismanis, 1966) = Sуn. Philometroides cyprini (Ishii, 1931) in fish farms of Belarus. Seasonal changes in the infection of fish by causative agents of helminthiasis and bacterial infections typify two species of bacteria (Sh.putrefaciens and A. hydrophila) and one species of helminths (Kh.sinensis). The maxima of frequency index for A. hydrophila were noted in april (80,0 %), for Sh. putrefaciens - in june (33,0 %). Contamination of the cestode Kh. sinensis in common carp reaches its maximum in the summer, this is because intermediate hosts of this type of helminth are characterized by high number of infected with Khawia