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The research in dairy cows in mountain aria demonstrated that the arithmetic average of the mammary repose period is about 62 days. This value is very close to the desired value of cow breeders. Very high value of the coefficient of variation (57.28%) shows that we are dealing with an average resulting from compensation. This theory is supported by very large difference of about 13 days between arithmetic and probable average of dry period. Probable average is 49 days to 311 registered cows, preceded by a shorter ...

The research conducted at farms in mountain areas have shown that the average age at first calving is 849.15 days (28 months and 5 days). The variability of this index is extremely large with the minimum of 570 days (19 months) and a maximum of 1350 days (45 months). It follows that the average age at first breeding would be 18 months and 10 days. At first glance this figure fits perfectly within the limits recommended by the literature, but the reality is different. Because of the desire to have the calving group...