EVALUATION OF THE EFFECTS OF ACCELERATED BODY GROWTH AND DEVELOPMENT ON THE HEALTH AND FERTILITY OF HOLSTEIN FRIESIAN FEMALES IN THE PERIOD SUBSEQUENT TO FIRST CALVING

COLĂ FLORICA, COLĂ M.

Abstract


The variation of the body weight of the heifers at 390 days of life was 31.40 kg, and the variation of milk production per 100 days of lactation was 119.16 kg. These values indicate the variation between the heifers due to the genetic diversity that characterizes the herd of cows .

The most important element of the analysis was the significant differences regarding the chance of heifers from the 4 weight categories at the age of 390 days. For example, heifers in category C - GC1 have a chance of calving 1.22 times higher than heifers in category C - G2. Heifers in category CGC 3 and CGC 4 had the chance to perform 0.82 and 0.70 times compared to heifers in category CGC2. The average time between the calving date and the date of first insemination was 86.5 days, and the interval between the calving date and the date of second insemination was 119.8 days.


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