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The study analyzed the impact of growth and development parameters of Holstein heifers on their subsequent productivity after the first calving. The material was based on records of first-calf cows (n = 570) raised at STOV “Promin” (Mykolaiv region).
It was found that the live weight of heifers at birth had a statistically significant effect on the lactation duration (P = 0.047) and total milk yield per lactation (P = 0.002), whereas the relationship with the 305-day lactation yield was not significant (P = 0.162).
The analysis showed no statistically significant effect of the average daily gain of heifers from birth to 90 days of age on lactation duration (P = 0.161), total lactation yield (P = 0.700), or 305-day yield (P = 0.413).
The dependence of primiparous productivity indicators on live weight at 90 days of age also revealed no statistically significant influence on lactation duration (P = 0.826), total lactation yield (P = 0.487), or 305-day yield (P = 0.128).
According to the results, the average daily gain of heifers from birth to insemination had no significant effect on lactation duration (P = 0.306), total lactation yield (P = 0.907), or 305-day yield (P = 0.935).
The live weight of heifers at 250 days of age did not have a statistically significant effect on lactation duration (P = 0.141), total lactation yield (P = 0.220), or 305-day yield (P = 0.189).
The average daily gain of heifers from birth to insemination had no significant effect on the duration of the dry period (P = 0.167) or the calving interval (P = 0.868).
Similarly, the live weight of heifers at 250 days of age did not significantly affect the duration of the dry period (P = 0.278) or the calving interval (P = 0.374).

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