Overwhelming majority of scientists during organization of feeding pay considerable attention to live weight of cows. However animals with identical live weight, but different habitus can have different fattening and, due to this, different forage requirement. Therefore the study of fattening dynamics, productive and reproductive qualities of different age animals under modern conditions of intensive technologies is actual.

As it is known, for cows after calving the negative power balance is determined, at which the requirement in nutritives on the milk productivity is higher, than actual energy of feed consumption. In this period of milk producting by cow happened due to the body nutritives which results the decline of animal live weight and fattening level. The loss of body weight must be limited most to 1 kg per twenty-four hours, and decline of fattening no  more than 1point during the lactation. It is necessary to provide the positive balance of energy not later, than in 60 days after the calving or even before. One kilogram of the fat mobilized from a body power provides the receiving 7 kg of milk yield.

Providing the animals with energy has the most influence on the reproductive function. The negative influence appears both for lack and at its surplus. The insufficient providing of high-yeielding cow with energy takes place usually after the calving: the greatest at this time milk yield results the excessive loading on metabolism. Under such conditions such diseases, as inflammation of uterus, absence of heat, change in ovaries, decline of animals immunity and productivity are not eliminated.

The purpose of work was the study of different lactations fattening cows dynamics and its influence on productive and reproductive functions under the conditions of loose management and free full ration mix feeding feed.

In SVK "Оstriyky" among all farm milch population (500 cows) most part is presented by cows fattened to 3points – 233cows (60,2 %), part of cows fattened from 3–4 points was – 117 cows (30,25 %), and cows fattened 4 and more points – 32 (8,26 %), the least were cows fattened to 2 points – 5 cows (1,29 %).

The results of researches, conducted in two groups of cows, showed an insignificant difference in the dynamics of their fattening. So, in a first-calf cow the fattening at the beginning of lactation presented 3,0 points with a further slump to 2,75 points on the second month of lactation and a gradual increase on 0,25 points on fifth, seventh, ninth and tenth months. For the cows of 2 lactation the fattening at the beginning presented 2,75 points with a further decline on 0,25 points on the second, and increase on 0,25 points on fourth, seventh, eighth and ninth months.

Under conditions of loose-cell technology of management and milking on "Merry-go-around" bail in the group of first-calf cow middle milk yield during the lactation was on 584,3 kg higher, than in the cows of 2 lactation. The constancy of lactational curves is certain after the Yoganson-Hanson index was higher in the cows of 2 lactation, and after the Turner index – some more lower.

Forms of lactational curves in the cows of both groups were practically identical during the lactation. A peak of the productivity was on the second month of lactation whereupon gradually monthly went down with the sharp falling after the 9th month.

The lactational curves of cows of both groups are characterized by the high index of yield falling. Thus the terms of management, feeding and exploitation at this technology provide the high yield of cows. However the cows of 2 lactation under such conditions have the less productivity  for something more intensive slump of lactation and its lower peak.

Our researches showed that the cows of both groups had middle fecundity. Thus the cows of 2 lactation are characterized by greater age of first calving (on 10 days), and an index of fecundity was almost at identical level in both groups. The duration of service period was 12 days longer, and between calving – on 11 days for the cows of 2 lactation, comparatively with the cows of 1 lactation. The coefficient of the reproductive ability is 1,3 % higher for cows of the first lactation.

It is set that due to result of the prolonged duration between calving period greater losses of milk for a lactation of the first-calf cow – 1702,36 kg comparatively with 1617,6 kg for the cows of 2 lactation, however in the percentage ratio losses were almost at one level.

Thus the index of adaptation had a minus value and was some higher for the cows of 1 lactation.

The technology of the loose-cell management with the selection of  the first-calf cows in a separate group provides the higher level of fattening of the first-calf cows comparatively with the cows of 2 lactation. Thus the lactational curves of the first-calf cows at the high level of lactation constancy indexes are characterized by a higher peak and less index of yield falling. The indexes of their reproductive ability have a tendency to the improvement comparatively with the cows of 2 lactation.

Key words: cows, fattening, lactation, productivity, reproduction.