DEPENDING OF RUMINATION DYNAMICS IN MILK COWS ON AGE IN LACTATION

Rumination (duration of cud in cows per day) becomes an effective and reliable test that characterizes the general state metabolism their body, process digestion predicted level productivity. In experiment on array dairy at Petrodolinsky LLC, using a remote electronic control system with SCR Heatime HR-IR feeding behavior monitoring function, nature rumination was observed depending age lactations. Studies have found average duration herd changes during lactation period The first time calving has lowest value, its maximum is recorded third lactation. By 30th day calving, indicator activity all ages levels off, however, it remains highest animals second Only by 200 days period, difference practically disappears. cessation before intensity again lower than older animals. It been established 30 after there close correlation between increase amount milk yield. At same time, coefficient for 0.78, - 0.65 0.63. When yield reached (100–120 lactation), drops sharply, (0.57) versus 0.48 0.42 lactations . However, phase lactation, corresponding significant characterizing relationship connection direct. After dependence decreases even more determines this 0.28 (first 0.24 0.23 results research are scientific practical interest determining assessing dynamics establishing economic use Keywords: cows, rumination, activity,