Abstract
Pskov and its region are biogeochemical provinces, since the composition of the soil of these territories is characterized by a low content of iodine and selenium. The deficiency of these trace elements will affect the composition of the feed, so it is necessary to use preparations based on selenium and iodine to prevent the appearance of symptoms of the corresponding microelementoses in cows kept in such areas. When evaluating the data obtained, a decrease in milking calcium and phosphorus in the blood serum of cows in the control group was revealed, which most likely occurred due to a lack of iodine and selenium in the normal diet of the natural cows of this farm. There is also a noticeable increase in such indicators as calcium and phosphorus in the selected samples of blood serum in both experimental groups of animals, in the diet of which two drugs were introduced: "Kayod" and "Sedimin". This haylage means a positive trend in the use of these preparations for animals.
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