In this preliminary investigation, various hematologic variables potentially influential in determining the degree of blood viscosity were evaluated in 10 Thoroughbred horses subjected to competitive acute running exercise. Following completion of sprints over a distance of 1.25 miles, mean percent (+/- SD) increases in PCV (38.3 +/- 12.9%), RBC (47.8 +/- 15.3%), and rouleaux index (232.7 +/- 176.8%) were recognized. Simultaneous increases in total plasma protein (28.3 +/- 5.31%), serum albumin (26.7 +/- 6.80%), alpha 1-globulin (60.0 +/- 49.0%), alpha 2-globulin(25.5 +/- 27.9%), beta 1-globulin (46.7 +/- 21.1%), beta 2-globulin (35.0 +/- 50.6%), gamma 1- and 2-globulins (38.7 +/- 29.6%), and plasma fibrinogen (12.5 +/- 10.4%) concentrations increased simultaneously. Horses also had consistent decreases in albumin:globulin ratio (- 10.0 +/- 7.43%). Alterations in these hematologic values after acute running exercise in Thoroughbred horses accompanied increases in serum (69.3 +/- 39.7%), plasma (39.7 +/- 11.9%), and blood (134.7 +/- 55.3%) viscosity.

A study was conducted to examine sources of variation introduced into a phagocytosis assay as a result of the isolation of neutrophils from bovine blood, including variation attributable to isolation of neutrophils from blood, variation between duplicate determinations of percentage phagocytosis, and the variation in the ability of neutrophils isolated from blood (over repeated collections from the jugular vein) to phagocytose. For the phagocytosis assay, jugular venous blood from each of 4 cows was divided into 2 equal portions. The neutrophils were isolated by lysis of red blood cells with 0.2% sodium chloride. The neutrophils (2 X 10(7)) were incubated in duplicate with 32P-labeled Staphylococcus aureus ([32P]SA; 2 X 10(8)) inskimmed milk samples (2.5% final concentration) prepared from 4 cows. This process was repeated thrice on neutrophils isolated from 4 cows at 2-week intervals. The proportions of variation in percentage of 32P-labeled S aureus phagocytosed between duplicate neutrophil isolations and between duplicate assay determinations were 0 and 1%. Differences among skimmed milk sources and among runs, using blood neutrophils taken at different times from the same donor cow, accounted for 62 and 36% of the total variation. The results indicated that variation arising from blood neutrophil isolation introduced into a phagocytosis assay within a single-day trial is of no concern. The large variation among skimmed milk sample sources indicated differences among cows in the ability of their milk to support phagocytosis. The variation in neutrophil isolations over time for any cow was considered too large to allow for evaluation of physiologic and environmental effects on phagocytosis of neutrophils isolated from blood.

In the conditions of the Republic of Belarus there was realized a comparative studying of immune reactivity of broiler chickens immunized against Marek's disease by means of vaccines of Russian production. In course of the study it was established, that in broiler chickens vaccinated against Marek's disease (by means of cultural dry viral vaccine on the basis a virus of herpes of turkeys FS-126 and by liquid bivalent cultural virus vaccine Bimarek on the basis of strains of a herpes virus of turkeys and a herpes virus of hens) the revealed morphological changes in immune system organs of did not essentially differ and testified to the development of intense postvaccinal immunity. Economic efficiency of immunization of broiler chicken against Marek's disease under production conditions made 4,87 and 2,94 Belarusian roubles per 1 rouble of expenses, respectively. | Целью исследования явилось сравнительное изучение иммунной реактивности организма цыплят-бройлеров, иммунизированных против болезни Марека вакцинами российского производства. В ходе исследований установлено, что у цыплят-бройлеров, вакцинированных против болезни Марека культуральной сухой вирусвакциной из вируса герпеса индеек ФС-126 и жидкой бивалентной культуральной вирусвакциной Бимарек из штаммов вируса герпеса индеек и вируса герпеса кур выявленные морфологические изменения в органах иммунной системы существенно не отличаются и свидетельствуют о выработке напряженного поствакцинального иммунитета. Экономическая эффективность иммунизации цыплят против болезни Марека в производственных условиях составляет 4,87 и 2,94 рубля на 1 рубль затрат соответственно.

In the conditions of the Republic of Belarus there was studied the activity of hepatic specific enzymes of blood serum of bull calves of black-and-white breed in course of application of various doses of zinc-containing preparations. Application of zinc-containing preparations led to multidirectional change of activity of hepatic specific serum enzymes. Application of Zinkovet preparation in dose of 1,8 g/100 kg of live weight made it possible to essentially grade the indexes of hepatic tissue affect. In the experimental group at animals there was marked the lowering in activity alanine-aminotransferase, serum glutamic oxalacetic transaminase and gamma-glutamyl transpeptidase. At the same time, there was noted the increasing of zinc-containing enzymes activity (sorbitol dehydrogenase and glutamate dehydrogenase). All these processes were caused by zinc inclusion into the metabolic process.

In the conditions of the Republic of Belarus there was realized an experimental study of a new method treatment of calves diseased with abomasoenteritis by means of application of a preparation Ranitidin. As a result of realized research it was established that the preparation had an expressed therapeutic activity. Inclusion of Ranitidin preparation into the complex therapeutic regimen of calves sick with abomasoenteritis with the enteral feeding once in day in a dose of 0,15 g promoted the reduction of duration and decrease in severity of the disease. There were presented the results of biochemical blood indicators in trial and control groups of calves, haematologic indices in trial and control groups of calves prior to the beginning of experiment and in the end of the test.

In the conditions of the Republic of Belarus there was studied the efficiency of application of forage chemical preservatives Kormoplyus-1, Kormoplyus-2, and Kormoplyus-3 for grass fodder conservation. The analyzed preservatives contained acetous acid, urotropine and sodium acetate (only in Kormoplus-2). In course of the study there were established experimental batches with the studied sreservative; there was determined a chemical composition of prepared forages; in physiological and scientifical and economic experiment there was analyzed the feeding efficiency of cereal ensilage. Research results showed that application of preservatives Kormoplyus-1 and Kormoplyus-2 2 for preparation of cereal ensilage made it possible to receive a high quality ensilage and to increase the dry matter safety on 4,2-8,7% and protein on 12-9,4% on comparison with storage without preservatives. Also, it made it possible to increase the digestibility of dry matter in cattle diets respectively on 5.5% and3.7%; organic substance - on 5.5% and 4.0%; fibre - on 16,5% and 15,0%, and also to increase nitrogen deposition on 17,4 and 20,8%. Feeding with forages preserved with Kormoplyus-1 and 2 did not render negative influence on a health state and biochemical indices of animal blood.