Studies were conducted on 8 cows and 22 heifers prepared as recipients of embryos. All the cows and 19 heifers were subjected to embryo transfers, the remaining 3 heifers being the control group. The temperature of the milk was taken automatically during milking and body temperature was measured rectally from the first day after synchronized oestrus up to 12 days following the embryo transfer. The heifers body temperature was taken rectally during the same period. Temperatures were recorded twice daily (in the morning and evening) and on the days of the embryo transfer they was recorded more often amongst the heifers. Following the embryo transfer, an increase in body and milk temperature was recorded in 6 cows, and in 12 heifers there was an increase in body temperature. In the decided majority of heifers (11) and in the majority of cows (4) an increase in body temperature occurred on the day of the embryo transfer. In the remaining animals this increase was recorded on the day following the embryo transfer. A probable reason for the increase in body and milk temperature in cows and body temperature in heifers, following embryo transfer, is considered to be an immunological response of the recipient's organism to the appearance of the embryo in the uterus.
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