In the conditions of the Republic of Belarus there was analyzed the influence of inclusion into broiler chickens diets of probiotoc preparation Bifidoflorin zhidkij (liquid) and prediotic veterinary drug Biofon AIL on the natural resistance, hematopoiesis, growth, metabolic function, development and viability of broiler chickens. In course of the study there was analyzed the dynamics of total haemoglobin, total protein of blood serum, albumins and globulins of broiler chickens which were fed with veterinary drugs probiotoc Bifidoflorin zhidkij and prediotic Biofon AIL. Indexes of chicken viability and life weight gain were marked. Research results showed that application of the presented veterinary preparations rendered the growth promoting action, lowering of disease incidence, increasing of chicken viability, increasing of live weight gain and stimulation of metabolic processes in the most intense period of poultry growing. All these factors were expressed in highest degree after the combined application of the probiotic and prebiotic veterinary drugs.

In the conditions of the Republic of Belarus there were analyzed the peculiar features of morphology of bursa of Fabricius of turkeys broad-breasted white turkeys at the stage of postnatal ontogenesis. Research results showed that postnatal ontogenesis of bursa of Fabricius of turkeys developed irregularly with preservation of organ up to 220 days. At turkeys in 300-day old age the organ preserved only in 45% of bird units. Form, colour and consistency of bursa of Fabricius depended on bird age. The absolute weight of the organ increased up to 220 days. The relative weight was maximum at 20-day old age. The sexual peculiar features of the organ morphology were insignificant; they revealed after the beginning of sexual maturity and expressed by some difference in weight and linear dimensions.

In the conditions of the Republic of Belarus there was studied the activity of alaninaminotranspherase (AIT) and aspartate aminotransferases (AsT), alkaline phosphatase, lactic dehydrogenase, cholinesterase, alpha amylase in blood serum, liver and pancreas of 130-158-day old replacement chicks vaccinated against Newcastle disease. Research results showed that the most essential changes were observed from such enzymes, as AsT and AIT. Increasing of AIT activity in a liver, pancreas and blood serum of immunized hens was stated on the seventh day after vaccine administration. Character of changes can testify both the increasing of synthesis of the mentioned enzymes, and also their posttransmitting activation which took place due to intensification of transamination processes. Changes of activity of alkaline phosphatase, cholinesterase and alpha amylase were the most expressed on the 14th and 21st days of research. It was possible to assume, that there was a stimulation of synthetic function of hepatocytes under the influence of the vaccine. It was possibly the decreasing of enzymatic functions pancreas.

In the conditions of the Republic of Belarus there was determined the influence of multi-enzymatic veterinary drug preparations Vitazim (contained a complex of enzymes of carbohydrases: xilanase; cellulose; beta-glucanase) and Ehkosim (universal multi-enzymatic complex: beta-glucanase; endo-xilase; and cellulase) on microbial composition of intestinal bacterial population. Research was realized by an example of layer hens of four-linear cross Highsex white at the age of 34-51 weeks. Regimens of administration of the analyzed preparations were presented. Research results showed promoted the development of the regenerative process of physiological media in intestines of poultry which was necessary for subsisting of normal flora of pathogenic bacteria. The studied preparations Vitazim and Ehkosim can be applied for the preventive treatment and therapy of intestinal dysbacteriosis, normalization of its microbial flora, as well as for the antibacterial therapy.

Research of a pancreas of geese in course of different age-specific periods was realized in the conditions of the Republic of Belarus. Ecological features of water fowl inhabitance, prevalence of phytogenous forages in a diet of led in first two life decades to rapid growth of body weight and pancreas which was capable to adapt an organism to new conditions of existence. The subsequent growth and differentiating processes in a pancreas of geese showed direct correlative dependence on the basic physiological states of their organism (plumage, a moult, puberty, egg production efficiency). By the beginning of egg production (6 months) the basic structural components of secretory parts of gland of geese reached a rather developed condition, but their full morphological and functional maturity occurred by 2-year-old age, possibly, because of a long reproductive period of life. | Проведено исследование поджелудочной железы у гусей в разные возрастные периоды. Экологические особенности среды обитания водоплавающих птиц, преобладание в рационе кормов растительного происхождения приводят в первые две декады жизни к бурному росту массы тела животных и поджелудочной железы, способной адаптировать организм к новым условиям существования. Последующие ростовые и дифференцировочные процессы в поджелудочной железе гусей проявляют прямую коррелятивную зависимость от основных физиологических состояний их организма (оперение, линька, половое созревание, яйценосная продуктивность). К началу яйценоскости (6 месяцев) основные структурные компоненты секреторных отделов железы гусей достигают достаточно развитого состояния, но их полная морфофункциональная зрелость наступает к 2-летнему возрасту животных, вероятно, из-за продолжительного репродуктивного периода жизни.

In the conditions of the Republic of Belarus there was studied the veterinary and sanitary quality and safety of poultry slaughter products after application of a natural biological corrector VitoLAD produced in Belarus on the basis of cultivation of nonpathogenic strain of fungi Fusarium sambuninum MKF-2001-3 used for restoration of dysfunction disorders. As a result of the realized bacteriological research there were marked no pathogenic and opportunistic organisms in all experimental samples of meat and internal organs. Indices of biological value of meat of three experimental and control group had no authentic differences. Displays of toxicity for infusorians were not marked. Poultry meat of investigated samples in control, and all three experimental groups (doses of 0,25 ml/head - the second experimental group, a dose of 0,5 ml/head - the third experimental group and a dose of 1 ml/head - the fourth experimental group) in diets of which there was added the natural biological corrector VitoLAD, proved to be good-quality and harmless. In accordance with organoleptic, physical and chemical, bacteriological indexes, as well as biological value and harmlessness did not concede to meat of the control group. The complex veterinary and sanitary estimation of bird carcasses of three experimental and control groups did not show any deviations from existing standards that made it possible to organize production realization without restriction.

In the conditions of the Republic of Belarus there was showed the possibility of import substitution of methionine and threonine preparations used for growing poultry birds by a new national developed in Belarus fodder additive L-homoserine. The chemical composition of the new feed additive L-homoserine is the following: amino acid L-homoserine; metabolizable energy; crude protein; crude fat; vitamins (B1; B2; B3; betaine; B5; B6; Bc); macro and trace elements (calcium; phosphorous; natrium; manganese; zinc; iron; copper). In course of the study there was analyzed the dynamics of body weight of broiler chickens; expenses of fodders per live weight gain; dynamics of body weight of replacement growing birds; indexes of second pen-feathers; dimensions of combs). Research results showed that addition of L-homoserine for broiler chickens diets was safe and nontoxic; the preparation showed the same growth promoting indexes as the foreign methionine and threonine preparations.