Reproductive performance and intensity of use of productive potential in cows

Abstract

The reproductive performances (SP - service period, CI - calving interval, Insemination index, percentage of fertilization at first insemination) and the intensity of use of milk production potential of Holstein breed (HL) cow population were studied. Change of level of milk productivity cows in the direction of increase or decrease of 1000 kg leads accordingly to decrease or increase the indicators of reproductive function. The reproductive performance indicators of cows in herds with milk productivity from 4000 to ≥ 8000 (SRL “Holstein”) and from 6000 to ≥ 10000 kg and more (SRL “Doksancom”) revealed two peaks in productivity levels - from 5000 kg milk and from 8000 kg milk. Increasing the service period contributes to increasing the milk yield per normal lactation, but this is not rational because it decreases the average amount of milk per head/day by about 8.1-19.2%, depending on the level of productivity.