Investigation of histological structures of liver of fattening broiler chickens after application of concentrate of E and F vitamins produced on the basis of rapeseed oil was realized in the conditions of the Republic of Belarus in order to evaluate their efficiency for prophylaxis of massive hepatic necrosis. Research results showed that application of the vitamins on the basis of rapeseed oil promoted the support of structural properties of hepatic cells that proved their higher antioxidant efficiency in comparison with synthetic vitamin analogues

A description of a method of chemical inactivation of Aujeszky's disease virus by teotropin was studied in the conditions of the Republic of Belarus. The developed inactivated viral suspension was tested for its antigenic activity. On the basis of realized experiments there were determined the optimal parameters of inactivation of Aujeszky's disease virus y means of 0,1% solution of teotropin under temperature of 37 deg C, pH 7,8 and duration of exposition of 24 hours. There were studied indexes of antigenic activity of inactivated virus

Research results showed that in the conditions of correct organization and application of technological methods of livestock breeding and feeding it was possible to achieve high livability rate of sheep and lambs up to 90%. Also it was possible to get a substantial break of infection chain of many sheep diseases (especially those which had a respiratory nature). Research results showed that simultaneous application of convalescent-phase serum against sheep acute respiratory diseases, as well as Nitox 200 and Invamek for treatment of sheep and especially 2-3 month old lambs with respiratory infectious diseases promoted the recovery of 80-100% of animals.

In the conditions of immunization of swine by experimental produced at Vitebsk Biofactory in the Republic of Belarus vaccines in blood of experimental swine there stated the morphological changes which pointed to formation of immune response.

Analysis of national studies and literary sources on problems of haemophilus pleuropneumoniae of swine was realized in the conditions of the republic of Belarus. Research was realized in the conditions of Agricultural Production Co-operative Uritskoe (Gomel region, Belarus). It was established that medical actions gave positive result only at early stages of disease.

Results of studying the local of irritating properties of preparative forms of marsh cinquefoil (Comarum palustre) which were intended for treatment of parasitic of diseases of animals, namely, strongylatosis of gastro-intestinal tract of sheep and calves realized in the conditions of the Republic of Belarus were presented. Preparative forms of Comarum palustre (liquor, tincture, liquid extract and powder) had poorly expressed irritating properties after application into skin of animals and weak irritating action, excluding native forms of tincture and liquid extract on mucous coat eye, that confirms their low toxicity action as a whole on organism of animals.

Development of a new national preparation for the preventive maintenance of cow mastitis, fissures of milking tubes skin of cow udder was realized in the conditions of the Republic of Belarus. The preparation Maz' Solnechnaya ("Unguent Solnechnaya") did not contain antibiotics, hormones and other synthetic components. Natural components of a preparation provide long anti-inflammatory action, stimulate local blood circulation, regeneration of epidermis and accelerate processes of healing of microtraumas. Besides it possesses high efficiency at preventive maintenance of mastitises at cows.

Definition of quality parameters and chemical composition of feeds, evaluation their nutritional value and composing on this basis optimal rations for high productive animals are the most significant conditions for their health and production. More often metabolism disorders registers in the conditions of intensive animal production, at high dairy efficiency and intensive fattening. At animals at disorder of key parameters of technology (unbalanced feeding, hypodynamia, lack of insolation) is broken metabolism, decreases natural resistance, goes down quality of production that conducts to disease, premature culling and to the compelled slaughter of animals. On frequency these diseases occupy on the average 10% from all noncontagious diseases, and on dairy complexes with industrial technology and in specialized feeding economy at intensive cultivation on their share it is necessary over 30% of a noncontagious pathology. Today the control of rations on such indicators, as dry matter level, quantity of exchange energy, the maintenance of a crude and digested protein, amino acids, sugars, starch, cellulose, fat, macro-and microelements, vitamins, and also sugar-energy-protein and calcium-phosphoric parities, acid-base balance has got special value. The lack of those or other nutrients causes infringement of a clinical condition of animals and reduces their efficiency. Among the most widespread diseases of the animals registered in animal industry: cattle ketosis, osteodystrophy, endemic struma, hypomagnesiemia tetany, pasturable tetany, microelementosis, hypovitaminoses A and Е.

The use of low intensive red spectrum laser radiation for prevention of abomasoenteritis in calves is effective method. As a result the increase of erythrocytes level and saturation of them with hemoglobin happens. Natural resistance with bactericide and lysozyme activity are going up phagocytosis of neutrophils is activated. The most successful method are magnet-laser radiation of blood and laser acupuncture. There was studied the low intensive red spectrum laser radiation for prevention of abomasoenteritis in calves. During the research it is established, that preventive efficiency at abomasoenteritis in the first trial group has made 80%, in the second and the third - 90%. As a result of the spent work high preventive efficiency of action of the low intensive red spectrum laser radiation is established at prescription of through-skin blood irradiations by the therapeutic laser in a combination to a constant magnetic field and as a result influences on biologically active points. Application of these ways allows to reduce level of disease of animal abomasoenteritis. As a result of physiotherapeutic influence there is content increase of erythrocytes in blood of calves and saturation their haemoglobin. Natural resistance with bactericide and lysozyme activity are going up phagocytosis of neutrophils is activated. The most successful method are magnet-laser radiation of blood and laser acupuncture. It is caused by that positive changes occurring in an organism, have been more brightly expressed and besides preventive and economic efficiency of these ways of irradiation also were at higher level. In the tabular form dynamics of morphological indicators at calves under the influence of laser radiation, dynamics of indicators of natural resistance at calves as a result of the laser therapy, some biochemical indicators of blood is presented at carrying out of research.

The purpose of the research was establishment of hepatic diseases spread in cattle fattening. Trials were conducted with total number of hybrids IV-V generation of black-motley heifer with pedigree Hereford bulls. It has been established the wide spread (22,4%) of hepatic pathology. The leading place among all hepatic pathologies belongs to fatty hepatosis (13,4%) with weakly expressed symptoms, decrease of serum protein level, albumin, glucose and increase of bilirubin, globulins, hepatic enzymes and strong pathology-anatomical and histological manifestations. In the tabular form results of histologic research of liver, some biochemical indicators of blood of healthy and sick animals (M +/- m), the clinical symptoms revealed during the various periods are resulted | Целью исследований являлось изучение структуры и установление широты распространения болезней печени у крупного рогатого скота на откорме. Опыты проведены на широком поголовье помесей IV-V поколения тёлок чёрно-пёстрой породы с племенными быками герефордской породы. Установлено широкое (22,4%) распространение гепатопатий. Ведущее место среди различных форм поражения печени принадлежит жировому гепатозу - 13,4%, морфофункцинальный профиль которого определяется слабо выраженными клиническими симптомами, уменьшением уровня общего белка, альбуминов, глюкозы, повышением концентрации билирубина, активности гепатоспецифических ферментов, а также всех фракций глобулинов, яркой и характерной патологоанатомической и гистологической картиной. В табличной форме приведены результаты гистологического исследования печени, некоторые биохимические показатели крови здоровых и больных животных (M +/- m), клинические симптомы, выявленные в различные периоды