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No-contact microchip monitoring of body temperature in yearling horses

Abstract : In clinics, temperature is used as an indicator of health. Mostly rectal temperature is recorded, requiringhandling and time. Temperature-sensitive identification microchips could be an alternative. Foals (26males and 17 females), 4e12 months old, were housed in stalls over two winters (DecembereFebruary).They were equipped with an identification and temperature sensor microchip implanted in the neckline.Temperature was recorded using an antenna located near the drinking trough. Animals were fedconcentrated feed and forage twice daily, with free access to water. Rectal temperatures (79 measure-ments) were recorded simultaneously in 26 animals. Data were analyzed with a linear mixed model,using natural cubic splines for the mean curve and a random horse effect. All animals remained healthythroughout the study. More than 100,000 recordings were obtained. Mean temperature for all in-dividuals at all times was 37.5±0.1 C. Time of the day affected temperature with a daily amplitude of0.96 C(P<.001). Lowest temperatures were observed before dawn, the acrophase occurring around18:00, with a smaller increase around midday. Mean temperature was 0.26 C higher in males (P<.05). Itwas also 0.1 C higher in light (<200 kg) compared with heavier foals (P<.001). Temperature decreasedwith increasing daylight ( 0.35 C over the study period,P<.001). Microchip and rectal temperaturesremained within normal limits and were significantly correlated (R2¼0.16,P<.001). This noninvasivetool does not require extra-handling and will allow a better monitoring of normal body temperaturevalues taking into consideration time of the day, meal time, and sex.
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https://hal.inrae.fr/hal-02620357
Déposant : Migration Prodinra <>
Soumis le : lundi 25 mai 2020 - 22:19:39
Dernière modification le : lundi 15 juin 2020 - 14:06:02

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Juliette Auclair-Ronzaud, Stéphanie Benoist, Cedric Dubois, Marie Frejaville, Tristan Jousset, et al.. No-contact microchip monitoring of body temperature in yearling horses. Journal of Equine Veterinary Science, WB Saunders, 2019, 86, pp.102892. ⟨10.1016/j.jevs.2019.102892⟩. ⟨hal-02620357⟩

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