Journal of thermal biology最新文献

{"title":"Embryological incubation temperature modulates behaviour in larval white sturgeon (Acispencer transmontanus)","authors":"Trevor J. Hamilton ,&nbsp;Katherine Cheung ,&nbsp;James Hudson ,&nbsp;Joshua Szaszkiewicz ,&nbsp;Erica Ingraham ,&nbsp;Jeffrey Krook ,&nbsp;Andréa Johnson ,&nbsp;Brian Franczak ,&nbsp;Steve McAdam ,&nbsp;Colin J. Brauner","doi":"10.1016/j.jtherbio.2025.104069","DOIUrl":"10.1016/j.jtherbio.2025.104069","url":null,"abstract":"<div><div>White sturgeon inhabit large rivers and estuaries along the Pacific coast of North America and play important ecological and cultural roles. As with other poikilotherms, the expected rise in global temperatures will create physiological challenges for sturgeon, including direct effects on physiological rates, and may also cause changes in behaviour that impact survival. In this study, we investigated ‘carryover effects’ in white sturgeon (<em>Acipenser transmontanus</em>) by incubating fish at one of three embryological temperatures (12 °C, 15 °C, or 18 °C) from fertilization to hatch, and then holding them at 15 °C for the following 30 days post-hatch (dph). We investigated the effect of these incubation temperatures on subsequent behaviours, including locomotion and anxiety-like behaviour, at 18, 24 and 30 dph. The open field test was used to quantify distance moved by the fish and time spent near the outer wall of the arena (to quantify thigmotaxis, an indicator of anxiety-like behaviour) and recorded with motion-tracking software. This test was also used to compare behaviour during the day versus night (at 21 dph) and hourly at night (at 28 dph). Additionally, a light/dark test commonly used in rodents and other fish species was performed for the first time on larval sturgeon at 24 dph. We found a significant family effect; the impact of embryo rearing temperature on locomotion and thigmotaxis varied depending on the family lineage of the fish. Furthermore, we provide evidence that larval sturgeon exhibit greater locomotion at 24 and 30 dph compared to 18 dph, and have a preference for the light zone of the light/dark test. Our findings identify a more nuanced effect of incubation temperature on later life stages that varies with family lineage and underscores the need to consider such variation in research and conservation programs.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104069"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the potential of geothermal heat pump and precision air supply system for heat stress abatement in dairy cattle barns","authors":"Yangyang Li ,&nbsp;Ran Ju ,&nbsp;Chongtao Liu ,&nbsp;Xiuping Tao ,&nbsp;Jianchao Song","doi":"10.1016/j.jtherbio.2024.104039","DOIUrl":"10.1016/j.jtherbio.2024.104039","url":null,"abstract":"<div><div>Maintaining an optimal indoor thermal environment is crucial for enhancing the welfare and productivity of livestock in intensive breeding farms. This paper investigated the application of a combined geothermal heat pump with a precision air supply (GHP-PAS) system for cooling dairy cows on a dairy farm. The effectiveness of the GHP-PAS system in mitigating heat stress in lactating dairy cattle, along with its energy performance and local cooling efficiency in the free stalls were evaluated. A total of 140 multiparous lactating Holstein cows was tested in two groups. One group was housed in a barn equipped with a GHP-PAS system (GP barn, n = 70), and the other was housed in a barn with a conventional fan-sprinkling system (FS barn, n = 70). Results showed that the ambient temperature of both GP and FS barns were lower than that outside the barn (<em>P</em> &lt; 0.05), with no significant difference between the GP and FS barns (<em>P</em> &gt; 0.05). Compared to cows in the FS barn, those in the GP barn exhibited lower skin temperature, rectal temperature, and respiratory rate (<em>P</em> &lt; 0.05). The mean temperature difference between outflow and inflow water was 2.56 °C of the GHP unit. The average energy efficiency ratios (EER) of the GHP unit and the GHP-PAS system were 5.03 and 2.92, respectively. The daily average electricity consumption was 20.4 ± 1.0 kWh. The field test results indicated that the airflow from a single nozzle of the GHP-PAS system effectively covered a stall space with an average width of 1.84 m at a cow reclining height of 0.5 m, with an average air velocity of 1 m/s. The per-cow hourly electricity consumption for cooling was 2.04 kWh for the GHP-PAS system and 0.36 kWh for the FS system, highlighting that the GHP-PAS system is approximately 5.6 times more energy-intensive than the FS system. In conclusion, the GHP-PAS system showed the potential for alleviating heat stress in dairy cows. Further research is needed to enhance the energy efficiency and cooling effectiveness of the current GHP-PAS system.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104039"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142983984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Individual variation in diurnal body temperature and foraging activity in overwintering black-capped chickadees (Poecile atricapillus)","authors":"Deborah M. Hawkshaw ,&nbsp;Jan J. Wijmenga ,&nbsp;Kimberley J. Mathot","doi":"10.1016/j.jtherbio.2025.104059","DOIUrl":"10.1016/j.jtherbio.2025.104059","url":null,"abstract":"<div><div>Small birds in winter can mitigate energetic shortfalls via increases in foraging and/or via controlled reductions in metabolic rate and body temperature (torpor). The ability to both increase foraging and use torpor during the day could have profound implications for an individual's daily energy budget and overwinter survival. Trade-offs between foraging efficiency and daytime torpor use may exist but have not been explicitly investigated. Here, we investigated the presence of within- and among-individual correlations between daytime body temperature (T_b, a proxy for torpor use) and foraging in overwintering black-capped chickadees (<em>Poecile atricapillus</em>). Using temperature-sensing passive integrated transponder tags, we measured daytime T_b and foraging in 20 free-living chickadees over 49 days in a single winter (January–February). Chickadees generally exhibited T_b around normothermic levels with an average T_b during visits to the feeder of 41.7 °C, though T_b ranged between 25.0 and 44.9 °C. Chickadees exhibited moderately lower daytime T_b, shorter time intervals between successive feeder visits (IVI), and increased feeder visits as ambient temperature decreased. However, within individuals there was only evidence of a weak positive correlation between visit T_b and IVI, and no correlation between daily feeder visits and daily mean visit T_b. We found that visit T_b, daily mean visit T_b_, and daily feeder visits were repeatable, while IVI was not. Sex did not explain a significant amount of variation in total daily feeder visits or daytime T_b, nor was there evidence of among-individual correlations between daily mean visit T_b and daily feeder visits. Our results suggests that chickadees may independently regulate foraging and diurnal T_b. Overall, our study provides insights into how small birds in winter can use multiple strategies to overcome energetic challenges. Future studies investigating diurnal torpor and its integration with other strategies are needed to further elucidate how small birds survive harsh winter conditions.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104059"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of life stage and season in critical thermal limits of carrion beetles","authors":"Chloe F. Garfinkel ,&nbsp;Christy M. McCain","doi":"10.1016/j.jtherbio.2025.104063","DOIUrl":"10.1016/j.jtherbio.2025.104063","url":null,"abstract":"<div><div>Larval and winter thermal limits may be vital for understanding responses to climate variability, but many studies of insect critical thermal limits focus on adults reared in benign conditions (lab or summer field conditions). For insects generally, temperature variability and thermal tolerance breadth are correlated. Thus, we predict broader thermal limits in adults compared to less-mobile larvae developing within a restricted microclimate. We also predict lower cold limits in winter adults compared to summer adults. To test for this thermal variability across life stages and seasons, we used a recirculating bath to determine critical thermal limits in two species of Colorado carrion beetles (Coleoptera: Staphylinidae: Silphinae) in which larvae develop within a carcass microclimate. For larval and adult comparisons, we used summer <em>Thanatophilus lapponicus</em> (n = 111) and <em>Thanatophilus coloradensis</em> (n = 46). For winter and summer comparisons, we used adult <em>T. lapponicus</em> (n = 103). We detected no difference between larvae and adults in <em>T. lapponicus</em> for either upper thermal limits (CTmax) or lower thermal limits (CTmin) for wild caught adults, bred larvae, and bred adults. In contrast, wild caught adults of <em>T. coloradensis</em> had a significantly lower CTmin (−5.7 ± 0.5 °C) compared to wild caught larvae (−3.0 ± 1.3 °C) and bred larvae (−3.5 ± 0.8 °C) with no difference in CTmax. Winter <em>T. lapponicus</em> adults displayed a nearly one-degree lower CTmin (−2.8 ± 1.6 °C) than summer adults (−1.9 ± 1.9 °C) with no difference in CTmax. These results demonstrate that even closely related, co-occurring species can have distinct strategies for coping with cold temperatures. And, in some cases, particularly for high-elevation specialists, larvae may benefit from a temperature-buffered microclimate. Heat tolerance was broad and less variable across life stages and seasons, emphasizing that variation in cold temperatures will be critical for responses to climate change, for example, changes in snow levels impacting insulation.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104063"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is skin temperature associated with training load during preparatory period of a professional volleyball team?","authors":"Thiago Seixas Duarte ,&nbsp;João B. Ferreira-Júnior ,&nbsp;Jeann C.G. Oliveira ,&nbsp;Carlos M.A. Costa ,&nbsp;Daniel B. Coelho ,&nbsp;João C.B. Marins ,&nbsp;Maurício G. Bara-Filho","doi":"10.1016/j.jtherbio.2024.104038","DOIUrl":"10.1016/j.jtherbio.2024.104038","url":null,"abstract":"<div><div>The current study investigated if skin temperature (Tsk) measurement through infrared thermography could reflect the accumulation of training load during the preparatory period of a professional volleyball team. Sixteen athletes (20.1 ± 3.1 years, 88.1 ± 6.1 kg, 193 ± 0.1 cm e 13.3 ± 2.3 % body fat) were assessed over two weeks of the preparatory period (5 training days in each week) for the second division of the Brazilian Men's Volleyball Super League. After one week of familiarization with the study procedures, Tsk was measured in eight regions (anterior and posterior areas of arm, shoulder, thigh, and leg) on the first and last training days of each week, along with perceived recovery status (PRS) were measured on the first and last training days of each week. Training load for each session and total weekly training load (TWTL) were calculated using the session rating of perceived exertion (SRPE) method. Three days in the first week and four days in the second week had higher training loads (χ² = 89.1, p &lt; 0.001), as indicated by a significant reduction in recovery perception at the end of each week (F = 52.3, p &lt; 0.001). Among the eight regions examined, five showed a decrease in Tsk after two rest days (weekend), while two regions exhibited an increase in Tsk at the end of the following training week (p &lt; 0.05). Out of 44 associations examined between Tsk, PRS, and TWTL, only the associations between delta PRS and delta mean Tsk of the anterior and posterior leg were significant (β = −0.20, p &lt; 0.045 for both). In conclusion, the data suggest that Tsk may be altered during the pre-competitive period of professional volleyball players; however, it does not appear to be associated with PRS and training load as assessed by the SRPE method.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104038"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spawning is accompanied by increased thermal performance in blue mussels","authors":"Katharina Alter ,&nbsp;Maria Constenla ,&nbsp;Francesc Padrós ,&nbsp;Inna M. Sokolova ,&nbsp;Ana Born-Torrijos","doi":"10.1016/j.jtherbio.2024.104018","DOIUrl":"10.1016/j.jtherbio.2024.104018","url":null,"abstract":"<div><div>Climate change is causing extreme short-term warming with greater intensity and more frequent occurrence. Reproduction and subsequent recruitment of coastal ecosystem engineers, such as the blue mussel, may be impacted by the extreme temperatures because these vital functions are sensitive to the timing of short-term changes in abiotic factors. We exposed intertidal blue mussels, <em>Mytilus edulis,</em> to a thermal challenge from 10 to 29 °C using an ecologically relevant heating rate of 4 °C/h. We assessed their reproductive status by observing spawning activity and by analyzing histological sections of their gonad tissue. In addition, we monitored their heart rates and valve gaping behavior to determine their thermal performance. We identified three spawning groups: non-spawners that had mature gonads but did not release gametes, post-spawners that released mature gametes prior to the thermal challenge, and active spawners that released mature gametes during the thermal challenge. Across temperatures, active spawners had significantly higher heart rates and their heart rate peaked at the temperatures 3.9 and 3.2 °C higher compared to those of non-spawners or post-spawners, respectively. Post-spawners had significantly narrower valve gapes across temperatures compared to both other spawning groups. Hence, the metabolic response to warming strongly depends on the reproductive status, with active spawners experiencing increased thermal stress due to heightened metabolism, non-spawners showing heat-induced metabolic depression, and post-spawners adopting an energy-conserving strategy indicated by reduced gaping. Considered together, spawning during recurring short-term warming events may elevate mortality risk with potential consequences for the local biodiversity in a future climate.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104018"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142872250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hot air injures human alveolar epithelial cells through ERK1/2 signaling-mediated ferroptosis","authors":"Ruihan Liu,&nbsp;Zhihui Wang,&nbsp;Qing Luo,&nbsp;Guanbin Song","doi":"10.1016/j.jtherbio.2025.104065","DOIUrl":"10.1016/j.jtherbio.2025.104065","url":null,"abstract":"<div><div>Inhalation lung injury is an acute pulmonary impairment resulting from inhalation of hot air and/or toxic gases. However, the molecular mechanisms involved in hot air-induced heat stress (HS) response of alveolar epithelial cells are not fully understood. In this study, employing a cell heat loading device, we found that HS at 50 °C resulted in significant ferroptosis and injury of human alveolar epithelial cells (BEAS-2B cells), supported by increased lipid peroxidation, reactive oxygen species (ROS), and decreased ferritin heavy chain 1 (FTH1), glutathione peroxidase 4 (GPX4), solute carrier family 7 member 11 (SLC7A11). Ferrostatin-1 (Fer-1), a targeted inhibitor of ferroptosis, could suppress HS-induced ferroptosis and injury of BEAS-2B cells. Moreover, HS activated extracellular signal-regulated kinase 1/2 (ERK1/2) in BEAS-2B cells. Nevertheless, blockage of ERK1/2 activation by U0126, an inhibitor of ERK1/2 phosphorylation, repressed HS-induced ferroptosis and injury of BEAS-2B cells. Taken together, this study demonstrates that HS injures alveolar epithelial cells through ERK1/2 signaling-mediated ferroptosis, which provides a novel potential strategy for the treatment of HS-induced inhalation lung injury.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104065"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143080617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of heat stress on growth performance, physiological responses, and carcass traits in broilers","authors":"Hye Ran Kim ,&nbsp;Pilnam Seong ,&nbsp;Kuk-Hwan Seol ,&nbsp;Jong-Eun Park ,&nbsp;Hana Kim ,&nbsp;Woncheoul Park ,&nbsp;Jin Ho Cho ,&nbsp;Sung Dae Lee","doi":"10.1016/j.jtherbio.2024.103994","DOIUrl":"10.1016/j.jtherbio.2024.103994","url":null,"abstract":"<div><div>High environmental temperatures lead to metabolic changes, body weight reduction, and high mortality in chickens, affecting poultry production worldwide. This study aimed to evaluate the effects of heat stress, assessed by the temperature–humidity index (THI), on the growth performance, physiological response, carcasses, and hematological traits of broilers. A total of 200 broilers (between 17 and 31 days old) were kept in thermoneutral conditions (21 °C; 60% relative humidity, RH) for 3 days during the adaptation period, followed by 14 days of exposure to the experimental treatments. The broilers were randomly assigned to 4 groups of equal size and raised in a temperature–humidity controlled chamber with THI ranging from 67 (21 °C; RH 60%) to 84 (33 °C; RH 60%). In boilers subjected to severe heat stress (THI 84), feed intake (−30%) and body weight gain (−51%) were decreased (P &lt; 0.05) in comparison with the performance parameters of broilers under thermoneutral conditions (THI 67). Moreover, under heat stress, the respiration rate and rectal temperature significantly increased (P &lt; 0.05), whereas blood parameters showed reduced levels of red blood cells, hemoglobin, white blood cells, lymphocytes, and electrolytes (K+, Na+). Regarding carcass traits, differences were observed in broilers exposed to severe heat stress, particularly in the reduction of the bursa of Fabricius as an immune organ growth index (P &lt; 0.05). This study shows that severe heat stress, as revealed by the high THI levels, alters the physiological reactions and metabolic processes of broiler chickens, leading to negative effects on their growth.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 103994"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142894914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increased age and reduced physical activity level worsen thermoregulatory pacing behaviour in men during walking exercise in the heat","authors":"Alison Millyard ,&nbsp;Henry B. Ogden ,&nbsp;Sally P. Waterworth ,&nbsp;David B. Pyne ,&nbsp;Joseph D. Layden ,&nbsp;Saul R. Bloxham","doi":"10.1016/j.jtherbio.2024.104019","DOIUrl":"10.1016/j.jtherbio.2024.104019","url":null,"abstract":"<div><div>Older adults are vulnerable to heat-related morbidity and mortality due to reduced thermoregulatory function associated with aging. The aim of this study was to examine the relationship between age and thermoregulatory behaviour during walking exercise in Control (22 °C; 40% relative humidity [RH]) and Hot (35 °C, 40% RH) conditions. Thirty-six healthy males (age 46 ± 20 (range 19–86) years; stature 177 ± 7 cm; body mass 75.7 ± 11.3 kg; BMI 24.2 ± 2.9 kg m⁻²; Ʃskinfolds 33.3 ± 10.5 mm; mean ± SD) each completed two experimental trials, one in Control and one in Hot conditions. Each trial consisted of three bouts of 10 min walking at a rating of perceived exertion (RPE) of 13, interspersed with 5 min of seated rest. Thermoregulatory behaviour was assessed as the ratio between distance walked in the Control and Hot trials. Participants walked 3.8% less in the Hot (2.63 ± 0.46 km) than in the Control (2.73 ± 0.4 km) condition (t(36) = −2.38, p = 0.023, d = 0.26). Regression analysis demonstrated that age was the primary predictor of thermoregulatory pacing behaviour, explaining 23% of the variance (Std β = −0.475, p = 0.003). Including physical activity levels (PASE) increased the variance accounted to 32% (age Std β = −0.396, p = 0.011; PASE Std β = 0.319, p = 0.038). In conclusion, thermoregulatory pacing behaviour was impaired with increased age and reduced physical activity when undertaking walking exercise at a perceived exertion of ‘somewhat hard’ in hot ambient conditions.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104019"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142907232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between body temperature measured by infrared thermography and performance, feed efficiency and enteric gas emission of hair lambs","authors":"Charleni Crisóstomo ,&nbsp;Rafael F. Bernardi ,&nbsp;Danielle N. Gurgeira ,&nbsp;Robson M.F. Silveira ,&nbsp;Rogério R. Vicentini ,&nbsp;Simón P. Márquez ,&nbsp;Adibe L. Abdalla ,&nbsp;Claudia C. Paro de Paz ,&nbsp;Josiel Ferreira ,&nbsp;Ricardo L. Dias da Costa","doi":"10.1016/j.jtherbio.2025.104070","DOIUrl":"10.1016/j.jtherbio.2025.104070","url":null,"abstract":"<div><div>Infrared thermography (IRT) is a noninvasive method that is one of the main indirect tools to optimize livestock measurements, as most changes in physiological conditions affect body temperature. This study aimed to evaluate the use of IRT to estimate residual feed intake (RFI) and residual intake and gain (RIG) of hair lambs, in addition to variations in performance, feed efficiency estimates, and gas emissions. Forty lambs were monitored during two feed efficiency tests to assess performance, feed efficiency estimates, and enteric gas emissions. These metrics were associated with IRT measurements from different body regions (eyes, hooves, rumen, and left flank). Temperatures were measured using infrared images collected with a Fluke camera, employing the non-steady-state rapid detection measurement method. Lambs were grouped into high (RFI-; RIG+), medium (RFI±; RIG±), and low (RFI+; RIG-) classes based on ± 0.5 standard deviations of adjusted RFI and RIG. To assess group differences, Tukey's test (P &lt; 0.05) was applied, along with Pearson correlation and multivariate analyses to determine relationships between variables. In the 2nd test, differences in RIG classification were observed for eye and left flank temperatures. Some performance variables and feed efficiency estimates, such as dry matter intake, feed efficiency, and feed conversion, differed by RFI and RIG classifications. In the 1st test, only N₂O and NH₄ emissions differed between RFI classifications, while in the 2nd test, CO₂ emissions were higher in RFI + animals. Performance and feed efficiency estimates were the primary variables, whereas temperatures measured by IRT had the lowest discriminatory power for RFI and RIG categories, followed by enteric gas emissions. Limitations related to animal numbers and environmental temperature variation in this study suggest that further investigation of the relationship between infrared thermography and animal performance efficiency is warranted.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"127 ","pages":"Article 104070"},"PeriodicalIF":2.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}