THE INFLUENCE OF LIVE WEIGHT OF MOTHER-COWS ON THE GOBIES GROWTH OF DIFFERENT BREEDS
From the studies of the influence of the mother's body on the offsprings live weight at birth and growth rate intensity it was determined that the gobies with greater live weight were obtained from the mother-cows with average and high live weight. This tendency was observed in the animals of Ukrainian black and white and red and white dairy breeds (control group) and Holstein and Ukrainian black and white dairy breeds (experimental group). At the age of 6 months the advantage in live weight also had gobies whose mothers were cows with average and high live weight. However, this advantage was not determined in young Holstein breed (control group) and the Ukrainian red and white dairy breed (experimental group) at birth and at the age of 6 months. Among animals of the experimental group the gobies of Ukrainian red and white dairy breed obtained from the cows with low live weight had the highest live weight (226,5 kg) at the age of 6 months. High live weight is typical for the gobies whose mothers were the cows with average and high levels of live weight. Some advantage of the gobies that are from the cows with low and average live weight was determined due to the indicators of the average daily growths. Significantly greater difference (123,3 g at P>0,95) according to the average daily gain of gobies was found in the Holstein breed (control group ) compared with their peers that come from mothers with high live weight. Experimental gobies of Ukrainian red and white dairy breed obtained from the cows with low live weight are characterized by the highest intensity of growth (average daily gain - 1027,3 g) for the period from the birth to the age of 6 months. The intense body weight gain from the birth to the age of 6 months was proved on the basis of comparable data of the control and the experimental groups of the gobies that are specialized dairy breeds. The relative gain for animals in the control group during the period of 0-6 months was 123,84-138,15%, and in the experimental group was 125,91-147,27%. The gobies obtained from the cows with average live weight levels were characterized by the highest intensity of growth. Thus, it was found that the live weight of mother-cows influences the growth rate of the specialized dairy breeds gobies in the period from their birth to 6 months. The gobies obtained from the cows with low live weight are characterized by a higher intensity of growth. Cubs which come from the mother-cows with average live weight have high intensity of growth.