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Background <p>Implantable loggers enable continuous monitoring of physiological parameters, providing valuable insights into animal health and welfare. The objectives of this study were to: (1) Compare two sites (coelomic cavity vs. neck) for implanting Star-Oddi loggers in broiler chickens; (2) assess recording performance for core body temperature (BT), heart rate (HR), and heart rate variability (HRV) in control versus corticosterone (CORT)-treated birds; and (3) compare BT values obtained from the loggers (intracelomic) with those from thermal microchips (intramuscular).</p> Results <p>Intracelomic implantation of the Star-Oddi logger produced substantially higher-quality HR recordings than neck implantation in the pilot study (62.4% vs. 12.2% QI 0–1), and was therefore selected for the main trial. In the main experiment, 80.2% of HR measurements were classified as highest quality (QI 0), yielding 14,029 valid recordings. BT measured by Star-Oddi loggers was significantly higher than temperatures obtained from thermal microchips (median difference = 0.23&#xa0;°C; <i>p</i> &lt; 0.001) and showed a weak correlation between devices (<i>r</i> = 0.25). BT decreased significantly with age (<i>p</i> &lt; 0.001), while HR declined from approximately 438&#xa0;bpm in week 2 to around 305&#xa0;bpm by week 6 (<i>p</i> &lt; 0.001). A clear circadian rhythm was observed for HR, with values at night being significantly lower than at all the other times of the day (<i>p</i> &lt; 0.001). CORT treatment had no significant overall effect on BT or HR but it affected both parameters differently depending on the time of day and the week of age (<i>p</i> &lt; 0.05). HR variability indices (SDNN and RMSSD) increased significantly during weeks 3–4 compared with week 2 (<i>p</i> &lt; 0.001) and then declined toward the end of the rearing period.</p> Conclusions <p>Intracelomic implantation of Star-Oddi loggers provided high-quality physiological data and detected changes under CORT challenge. Thermal microchips offered consistent measurements but recorded slightly lower temperature values when compared to Star-Oddi loggers. Star-Oddi loggers proved to be suitable for continuous monitoring of HR and BT, contributing valuable baseline physiological data for poultry research and precision livestock farming applications.</p>

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Monitoring heart rate, heart rate variability and body temperature in broiler chickens using implantable loggers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月3日

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  • Imad Khan,
  • Patricia Soster,
  • Camila Lopes Carvalho,
  • Frank A. M. Tuyttens,
  • Annelike Dedeurwaerder,
  • Maarten de Gussem,
  • Eli De Poorter,
  • Gunther Antonissen

摘要

Background

Implantable loggers enable continuous monitoring of physiological parameters, providing valuable insights into animal health and welfare. The objectives of this study were to: (1) Compare two sites (coelomic cavity vs. neck) for implanting Star-Oddi loggers in broiler chickens; (2) assess recording performance for core body temperature (BT), heart rate (HR), and heart rate variability (HRV) in control versus corticosterone (CORT)-treated birds; and (3) compare BT values obtained from the loggers (intracelomic) with those from thermal microchips (intramuscular).

Results

Intracelomic implantation of the Star-Oddi logger produced substantially higher-quality HR recordings than neck implantation in the pilot study (62.4% vs. 12.2% QI 0–1), and was therefore selected for the main trial. In the main experiment, 80.2% of HR measurements were classified as highest quality (QI 0), yielding 14,029 valid recordings. BT measured by Star-Oddi loggers was significantly higher than temperatures obtained from thermal microchips (median difference = 0.23 °C; p < 0.001) and showed a weak correlation between devices (r = 0.25). BT decreased significantly with age (p < 0.001), while HR declined from approximately 438 bpm in week 2 to around 305 bpm by week 6 (p < 0.001). A clear circadian rhythm was observed for HR, with values at night being significantly lower than at all the other times of the day (p < 0.001). CORT treatment had no significant overall effect on BT or HR but it affected both parameters differently depending on the time of day and the week of age (p < 0.05). HR variability indices (SDNN and RMSSD) increased significantly during weeks 3–4 compared with week 2 (p < 0.001) and then declined toward the end of the rearing period.

Conclusions

Intracelomic implantation of Star-Oddi loggers provided high-quality physiological data and detected changes under CORT challenge. Thermal microchips offered consistent measurements but recorded slightly lower temperature values when compared to Star-Oddi loggers. Star-Oddi loggers proved to be suitable for continuous monitoring of HR and BT, contributing valuable baseline physiological data for poultry research and precision livestock farming applications.