PRODUCTIVE LIFE OF HIGH YIELDING DAIRY COWS

The objective of the research was to investigate the significance of the main systematic effects on productive life of high yielding Black-and-White dairy cows. The average length of productive life reached 1494.18±463.66 days Observed by genotypes, the mean values were as follows: 1377.35 days (>73% HF), 1477.47 days (58-73% HF) and 1627.71 days (0.05)