Vaginal implant transmitters for continuous body temperature measurement in moose

Thompson, Daniel P.; Crouse, John A.; McDonough, Thomas Joseph; Badajos, Oriana H.; Adsem, Jon; Barboza, Perry S.

doi:10.1002/wsb.857

Cited by 13 publications

(14 citation statements)

References 46 publications

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“…To calibrate T r collected with MITs to core body temperature of moose, we recorded vaginal temperature with a modified vaginal implant transmitter (TVIT; Thompson et al ). We deployed TVITs ( n = 8, Model M3970; mass = 50 g; Advanced Telemetry Systems, Isanti, MN, USA) into sedated female moose ( n = 8) at the same time the MITs were deployed in early December 2014 (Thompson et al ). We periodically removed TVITs to assess potential discomfort from the device and redeployed during routine immobilizations throughout the study (Thompson et al ).…”

Section: Methodsmentioning

confidence: 99%

“…We deployed TVITs ( n = 8, Model M3970; mass = 50 g; Advanced Telemetry Systems, Isanti, MN, USA) into sedated female moose ( n = 8) at the same time the MITs were deployed in early December 2014 (Thompson et al ). We periodically removed TVITs to assess potential discomfort from the device and redeployed during routine immobilizations throughout the study (Thompson et al ). Temperature was recorded and stored on the TVIT at 5‐min intervals.…”

Section: Methodsmentioning

confidence: 99%

“…To avoid artificially lowering transmission rates, we removed missing temperature measurements from 1 collar that stopped functioning in May 2015 from presumed battery failure from the analysis. We assumed vaginal implant transmitter temperatures <30° C to be affected by environmental factors and data from these moose were removed from the study (see Thompson et al ). Time stamps of T r and T v were not always exactly the same, so we approximated T r by linearly interpolating between consecutive time stamps.…”

Section: Methodsmentioning

confidence: 99%

“…Our study was conducted at the Kenai Moose Research Center (MRC), located on the Kenai Peninsula, Alaska, USA. The MRC was a 970‐ha captive facility operated by the Alaska Department of Fish and Game that maintained moose at a density of 5–6 moose/260‐ha enclosure and characterized by a mixture of habitat types (Thompson et al ). Free‐ranging captive moose naturally foraged within the enclosures without supplement during this study.…”

Section: Study Areamentioning

confidence: 99%

“…Surgical implantation of long‐term, abdominal, or rectal temperature loggers is invasive and associated with increased risk of infection, adhesions, peritonitis, necrosis, and death (Eagle et al , Guynn et al , Wallace et al , Moe et al ). Vaginal temperature ( T v ) has been measured in domestic and wild ruminants by placing temperature recording sensors on blank controlled‐internal‐drug‐release devices (Vickers et al , Burfeind et al , Burdick et al ) or in modified vaginal implant transmitters (TVIT; Thompson et al ); however, the main limitation of these devices is that they can only monitor females, and if the animal is pregnant, the device will be expelled at parturition. Alternatively, minimally invasive rumen boluses have been developed to measure continuous body temperature, heart activity, and locomotive activity in ruminants (Signer et al ).…”

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confidence: 99%

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Calibration of a rumen bolus to measure continuous internal body temperature in moose

et al. 2018

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Mortality implant transmitters (MITs), a device that can record continuous rumen temperature, have been deployed in wild moose (Alces alces) in Minnesota, USA, to understand physiological and behavioral responses of moose to increasing ambient temperatures. We compared temperatures collected using MITs to temperatures collected using vaginal implant transmitters (VITs) in 8 captive female moose (>2 yr old) at the Kenai Moose Research Center in Alaska, USA, during 2015. Both devices collected continuous body temperature measurements at 5-min intervals for 1 year. We directly observed moose behavior for 384 hr during 4 2-week windows distributed seasonally within the sampling period, to assess potential effects of behavior on MIT-recorded temperatures. We documented a decrease in MIT-recorded temperatures following water intake and developed an approach for censoring these observations. After removing these observations, MIT-based temperatures were, on average, 0.038 C (95% CI ¼ À0.57-0.558 C;x ¼ 38.148 C) lower than VIT-based temperatures ( x ¼ 38.178 C; n ¼ 760,439). We fit linear mixed-effects models to test the relationship between MIT and VIT-based temperatures across seasons and individuals. On average, the difference between predicted and observed temperatures was 0.058 C (95% PI ¼ À0.19-0.298 C) and 0.338 C (95% PI ¼ 0.01-0.638 C) for winter and summer seasons, respectively. We conclude that minimally invasive MITs can accurately record internal body temperature in moose, and thus provide a tool for understanding physiological and behavioral responses of moose to environmental stressors. Ó 2018 The Wildlife Society.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

mentioning

confidence: 99%

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Calibration of a rumen bolus to measure continuous internal body temperature in moose

et al. 2018

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Field Physiology: Studying Organismal Function in the Natural Environment

Williams

Hindle

2021

Comprehensive Physiology

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Continuous physiological measurements collected in field settings are essential to understand baseline, free-ranging physiology, physiological range and variability, and the physiological responses of organisms to disturbances. This article presents a current summary of the available technologies to continuously measure the direct physiological parameters in the field at high-resolution/instantaneous timescales from freely behaving animals. There is a particular focus on advantages versus disadvantages of available methods as well as emerging technologies "on the horizon" that may have been validated in captive or laboratory-based scenarios but have yet to be applied in the wild. Systems to record physiological variables from free-ranging animals are reviewed, including radio (VHF/UFH) telemetry, acoustic telemetry, and dataloggers. Physiological parameters that have been continuously measured in the field are addressed in seven sections including heart rate and electrocardiography (ECG); electromyography (EMG); electroencephalography (EEG); body temperature; respiratory, blood, and muscle oxygen; gastric pH and motility; and blood pressure and flow. The primary focal sections are heart rate and temperature as these can be, and have been, extensively studied in free-ranging organisms. Predicted aspects of future innovation in physiological monitoring are also discussed. The article concludes with an overview of best practices and points to consider regarding experimental designs, cautions, and effects on animals.

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Acute Thermal and Stress Response in Moose to Chemical Immobilization

et al. 2020

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Management and research of moose (Alces alces) in Alaska, USA, often require chemical immobilization; however, moose may be prone to capture‐induced hyperthermia while immobilized. We chemically immobilized moose with carfentanil citrate and xylazine hydrochloride to measure rump fat depth, collect blood and fecal samples, and to deploy modified vaginal implant transmitters and global positioning system (GPS)‐collars for recording body temperature and movement during and after the chemical immobilization. We predicted wild moose pursued and captured from a helicopter would have elevated body temperature at time of capture, whereas body temperature would remain stable in hand‐raised captive moose not pursued and only hand‐injected for immobilization. Additionally, we expected post‐capture body temperature would be a function of activity, time immobilized, and ambient temperature. As predicted, body temperature of wild moose was elevated 1 hour after capture (38.9°C, 95% CI = 38.7–39.1°C) but returned to baseline levels within 3 hours (38.0°C, 95% CI = 37.9–38.1°C); however, body temperatures then rose above baseline levels and remained elevated 12–48 hours post‐capture when movement rates were also elevated. Body temperatures in captive moose were not elevated 1‐hour post‐immobilization (37.9°C, 95% CI = 37.8–38.0°C). Body temperatures of wild moose were positively related to cortisol levels at time of capture. Two moose that died after immobilization had initial body temperatures similar to other immobilized moose; however, their body temperature began to rise at 17 hours and 40 hours post‐immobilization. Our study provides evidence that chemical immobilization affects body temperature and movement of wild moose up to 48 hours after capture, possibly as a result of renarcotization from carfentanil citrate. With advancements in technology, we recommend fine‐scale GPS data (<1‐hr fix rates) and continuous body temperature be evaluated to detect evidence of renarcotization during and after opioid‐based captures of northern ungulates. © 2020 The Wildlife Society.

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Vaginal implant transmitters for continuous body temperature measurement in moose

Cited by 13 publications

References 46 publications

Calibration of a rumen bolus to measure continuous internal body temperature in moose

Calibration of a rumen bolus to measure continuous internal body temperature in moose

Field Physiology: Studying Organismal Function in the Natural Environment

Acute Thermal and Stress Response in Moose to Chemical Immobilization

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