The impact of the period of keeping cows on their biochemical composition of blood

The paper presents studies on the biochemical composition of blood in cows in winter housing and summer content. The researchers obtained information from the blood flow on the processes occurring in the body, much better than with other methods of study. Consequently, changes in the blood can be judged on intermediate metabolism of the organism, its protective reactions, and many other indicators, vital for animals. The main methods of research were samples of blood taken from the jugular vein in summer and winter content. Blood samples were taken from the jugular vein. Studies were performed on lactating Holsteins cows black-motley breed. Content was determined in blood of cows carotene, calcium, phosphorus, total protein, a level of reserve alkalinity and reaction to ketone bodies in the beginning of the stable winter and summer periods. The blood test results showed that the total amounts of protein in the blood of cows in winter 0.42 abs. mg/% was lower than in the grazing period, due to inadequate protein nutrition of animals. It should be noted that the content of carotene and also calcium in the blood was also lower in the winter 0.17 abs. mg/% and 1.65 abs. mg/% in comparison with summer period, respectively. Ketone bodies in both periods in the blood of cows was not detected. The results confirm that the unbalanced rations, low feed quality major causes of metabolic disorders in animals, as in the winter stabling period of the content, so in the summer.