A METHOD FOR MEASURING DEEP BODY-TEMPERATURE IN AVIAN EMBRYOS

Two methods for the measurement of deep body temperature in chicken em bryos (21st day of incubation) were compared: temperature of the allan toic fluid near the embryo (T-af) and colonic temperature (T-c). When ambient temperature (T-a) was raised to 40.5 degrees C T-af increased shortly after and parallel to T-a while T-c was kept nearly constant f or more than 40 min after the beginning T-a-rise. Measuring T-c has th e advantage of being the only possibility to get information about the embryo's deep body temperature after external pipping. Measuring T-af is sufficient and adequate for experiments concerning thermoregulator y heat production in normal or lowered incubation temperatures. (C) 19 98 Elsevier Science Ltd. All rights reserved.