Golova N. The metabolic profile of blood and milk fatty acid composition in cows fed diets with different selenium content

Object - mastering cows sodium selenite and selenium-methionine diet, receipt of selenium in milk, Selena effects on metabolism and fatty acid composition of milk. The aim - to establish the optimal dose input to the diet of cows sodium selenite and selenium-methionine, compare the effects of different amounts of organic and inorganic compounds Selenium Celenu the content in the blood and milk of cows and their milk production, and conduct comparative studies of the effect of different compounds on metabolic Celenu and antioxidant status of the organism, sharing long-chain fatty acids and fatty acid composition of milk fat cows. Methods: biochemical (chromatographic, spectrometric), zootechnical, statistics. Novelty: The thesis presents data pointed the effects of sodium selenite and selenomethionine addition to the diet of cows in the amounts of 0.2, 0.3 and 0.5 mg/kg of dry matter on antioxidant status and biochemical indices in the blood, fatty acid isomers composition of milk fat, selenium content in the milk and milk yields. The selenium content in milk of cows fed diets with addition the selenomethionine was increasing with rising ones amount in the diet, whereas after adding of sodium selenite the selenium content in the milk was much smaller and did not depend on the quantity. When fat content in the diet has elevated the concentration of selenium was increased in the blood and decreased in the milk. On the antioxidant status of blood and milk most effectively acted selenomethionine in a dose of 0.5 mg/kg. Feeding cows selenium increased the amount of odd and branched-chain fatty acids in milk what indicating the affects on rumen microorganisms. Adding to the cows diet selenomethionine increased levels of trans-11 and reduces the content of trans-10 isomers of 18:1 and 18:2 fatty acids in the milk fat. Supplementation of cows diet with selenomethionine in a dose of 0.2-0.3 mg/kg increased fat content in cow milk, sodium selenite did not affect on the milk fat content. Feeding sodium selenite at a dose of 0.5 mg/kg reduced milk yields of the cows.