STUDY REGARDING THE INFLUENCE OF THI ON THE LAST PERIOD OF GESTATION ON CALVES BIRTH WEIGHT AND THEIR SUBSEQUENT DEVELOPMENT

The aim of this study is to analyse the effects of thermal stress in the last part of cows' pregnancy on the calving weight of calves and on their post-partum weight growth. The data were structured by THI intervals and cow parity and values of the statistical estimators were calculated using the package SAVC and SPSS 16.00 for Windows. It was found that for different THI there are differences for calving bodyweight, from 46.45 to 42.52 kg in pluriparous case and from 45.13 to 40.89 kg for primiparous. For this trait there are significant differences between THI>65 and THI 45 respectively 55≤THI 65.