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The purpose of this study was to observe the changes in body temperature before parturition using a wireless temperature monitoring device (WTMD) and to evaluate the usefulness of body temperature measurements using a digital rectal thermometer (DRT) and a microchip transponder thermometry device (MTTD) for predicting parturition in mares. The body temperatures using a WTMD at 0 hr and -1 hr were significantly different from those at the same time on Days 1-5 (P&lt;0.01). The temperature differences between the morning of Day 0 and at -3 hr, -2 hr, -1 hr and 0 hr using the DRT and MTTD showed a significant drop compared with the temperature differences between the morning and evening of Days 1-5 (P&lt;0.05). Furthermore, when the cutoff value of the temperature differences between the morning and other times was set to ≤0, the sensitivities of the DRT and MTTD in the evening of Day 0 and at -3 hr were 43% and 100% and 71% and 86%, respectively. The results suggested that monitoring the body temperature differences between morning and within 3 hr before the time of parturition is a valuable method for predicting parturition in mares. Conversely, this method would be more useful in predicting parturition when used in combination with other observations such as the mammary gland size and waxing of the teat ends because it has nearly a 20% probability of false-positive results prior to the day of parturition.

journal of veterinary medical science

Assessment for Predicting Parturition in Mares Based on Prepartum Temperature Changes Using a Digital Rectal Thermometer and Microchip Transponder Thermometry Device