PECULIARITIES OF DAILY VARIATION SERIES IN THE SYSTEM OF MORPHOMETRIC, BIOPHYSICAL AND BIOCHEMICAL INDICES OF COWS' SKELETON AT THE MILK PRODUCTION PERIOD
The morphometry of skeleton bones (8 parameters) and ultrasonic osteometry of the metacarpus, ribs and bodies of the 5th caudal vertebra have been performed in clinically healthy Black-Spotted cows during the period of 6 months, for 3-6 days, 2 times a day, with 2 hours intervals. The blood serum levels of total calcium, total magnesium, inorganic phosphorus, and alkaline phosphatase have been determined. Using the algorithm of system analysis based on the circadian rhythm, the regularities of skeletal functioning in pregnant lactating cows during the day have been considered. The results obtained demonstrate the presence of two time periods during a day in the life of pregnant and lactating cows: the first period is from 5.00 to 19.00., when the skeleton of an animal is mainly subjected to destruction due to intensive discharging of its components into blood; the second period is from 19.00 to 5.00 hrs., when the skeletal system of dairy cows, on the contrary, reproduces them. The author concludes that the most complete and comprehensive assessment of the skeleton can be made only on the basis of a systematic approach, taking into account the daily activity rhythms of the skeletal system.