The rate of growth calves Simmental depending on the duration of embryogenesis and season of birth
In terms of the farm «Pchany-Denkovich» Zhydachiv district, Lviv region found that the best in the embryonic period and postembryonic grow and develop heifers second group with a mean duration of embryogenesis 280–289 days. Calves from the third group with a long duration of embryogenesis (293.1 days) grow best in the embryonic period of embryonic growth rate was 2.8 and 0.52% higher than in the first and second groups of short and medium duration embryogenesis, respectively. The advantage of these animals was observed and body weight (1, 3, 6 months), average (1, 4, 5 month). And absolute growth (1,4,5 months). In particular the study period. However, 2 and 6 months of age the same age in the second group with a mean duration of embryogenesis (284.6 days) dominated their counterparts in the first and third groups by average daily increments respectively – on 0.28% and 0.53 and 2.74% and 5.14% and the intensity of growth at 6 months of age by 1.9 and 2.9%. Heifer born in winter were the best indicators of fetal growth rate in experimental groups with short, medium and extended duration of embryogenesis, but embryonic fast-ripeness index tends to decrease. In winter, the live weight of calves at birth was also the highest that more than in calves born in summer in the first group at 3.94%, the second and third, respectively – at 2.63 and 3.44%. The most effective breeding Simmental heifers of different duration embryogenesis born in winter, because they were the best indicators of fetal growth rate and live weight at birth. During embryonic development of animals under the influence of heredity and state parent body formed features of the body structure and physiological functions, whose development after birth is largely determined by the conditions postembryonic period, so in terms of management appropriate to carry out the selection of heifers with the peculiarities of their development in early ontogeny to facilitate to a certain extent, the formation of the desired type and level of performance.
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