Journal of thermal biology最新文献_第3页

Evaluating the physiological benefits of behavioral flexibility in chacma baboons (Papio ursinus) using a biophysical model 使用生物物理模型评估chacma狒狒（Papio ursinus）行为灵活性的生理益处。

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2024.104042

Christine D. Grebe , Paul D. Mathewson , Warren P. Porter , Richard McFarland

As opportunistic generalists occupying a range of ecological niches, chacma baboons (Papio ursinus) are considered a highly flexible species of relatively low conservation priority. Underlying their ecological flexibility is a repertoire of behavioral strategies observed in response to ecological stressors. Although these strategies are relatively well-documented, we know very little about how they impact upon an individual’s thermal and energetic physiology, which can influence population-level reproductive potential in the face of climatic warming. Here, we used Niche Mapper™ to construct a biophysical model that integrates morphometric, autonomic, and behavioral inputs to predict the core body temperature of chacma baboons in response to varied microclimate conditions. The predictive integrity of the model was confirmed by comparing model outputs with the core body temperature of a free-living chacma baboon equipped with an intra-abdominal temperature-sensitive data logger. When behavioral thermoregulation was incorporated, our model predicted body temperature within 1.5 °C of the observed temperature for 94% of hours. Of the tested behavioral thermoregulatory responses, shade-seeking provided the greatest thermal benefit, reducing predicted core body temperature by an average of 0.9 °C during daytime hours. Evaporative heat-dissipation strategies (sweating or swimming) were also highly effective in circumventing hyperthermia in our modeled individual, with an average body temperature reduction of 0.6 °C. Our findings underscore the critical importance of behavioral thermoregulatory strategies coupled with access to essential microhabitat features, water and shade, to achieve homeothermy in a warming climate.

作为占据一系列生态位的机会主义通才，恰马狒狒（Papio ursinus）被认为是一种高度灵活的物种，其保护优先级相对较低。其生态灵活性的基础是在应对生态压力时观察到的一系列行为策略。虽然这些策略的记录相对较多，但我们对它们如何影响个体的热能和能量生理机能却知之甚少，而这些生理机能会在气候变暖的情况下影响种群的繁殖潜力。在这里，我们使用 Niche Mapper™ 建立了一个生物物理模型，该模型综合了形态计量学、自律神经学和行为学输入，可预测查克马狒狒在不同小气候条件下的核心体温。通过将模型输出结果与装有腹内温度敏感数据记录器的自由生活的查克马狒狒的核心体温进行比较，证实了该模型的预测完整性。当纳入行为体温调节时，我们的模型在 94% 的时间内预测的体温与观察到的体温相差不超过 1.5 °C。在测试过的行为体温调节反应中，遮荫能提供最大的热效益，使白天的预测核心体温平均降低 0.9 °C。蒸发散热策略（出汗或游泳）对我们的模型个体规避高热也非常有效，平均体温降低了 0.6 °C。我们的研究结果强调了行为体温调节策略的重要性，同时也强调了在气候变暖的情况下，水和遮荫等必要的微生境特征对实现体温调节的重要性。

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引用次数: 0

Effects of warm carbon dioxide insufflation vs. local heat on shoulder pain in laparoscopic cholecystectomy: A randomized clinical trial 热二氧化碳充气与局部加热对腹腔镜胆囊切除术肩关节疼痛的影响：一项随机临床试验。

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2024.104041

Saeideh Vaziri Kordestani , Ebrahim Nasiri-Formi , Mohammad Davood Qane , Elmira Khodabakhsh

Objective

Laparoscopic cholecystectomy is a common procedure for gallbladder diseases, but many patients experience shoulder pain due to pneumoperitoneum. This study investigates the comparative effectiveness of warm carbon dioxide gas insufflation versus local heat application in reducing shoulder pain after laparoscopic cholecystectomy. We also examined changes in body temperature during surgery and postoperative shivering in the intervention and control groups.

Methods

93 patients undergoing elective laparoscopic cholecystectomy were divided into three groups: Group A: Warm carbon dioxide gas, Group B: Local heat, Group C: Control. Patients' body temperature, shivering, and right/left shoulder pain were evaluated. Data was analyzed using SPSS software with a significance level of 0.05 and GEE regression.

Results

Mean right shoulder pain scores at 48 h and mean left shoulder pain scores at 24/48 h post-operation were significantly lower in the intervention groups compared to control (p < 0.05). There were differences in temperature body during surgery among the study groups. The mean body temperature was 0.48 units higher in Group B compared to the control group. Group A had a 0.14-unit lower temperature than the control group, although this difference was not statistically significant. No significant difference in postoperative shivering was observed among the groups.

Conclusion

Based on the findings of this study, Methods of warm carbon dioxide gas insufflation and local heating in laparoscopic cholecystectomy reduce shoulder pain in patients during the postoperative phase. The local heating method significantly increased the patients' body temperature compared to the other two groups, and shivering was similar across all three groups.

目的：腹腔镜胆囊切除术是胆囊疾病的常用手术，但许多患者因气腹而出现肩部疼痛。本研究探讨了热二氧化碳气体注入与局部热应用在减轻腹腔镜胆囊切除术后肩部疼痛方面的比较效果。我们还检查了干预组和对照组在手术期间的体温变化和术后颤抖。方法：93例择期腹腔镜胆囊切除术患者分为三组：A组：暖二氧化碳气体组，B组：局部加热组，C组：对照组。评估患者的体温、颤抖和右/左肩疼痛。数据分析采用SPSS软件，显著性水平为0.05，采用GEE回归。结果：干预组术后48 h右肩平均疼痛评分和24/48 h左肩平均疼痛评分均显著低于对照组(p)。结论：基于本研究结果，腹腔镜胆囊切除术中采用暖二氧化碳气体注入和局部加热的方法可减轻患者术后肩关节疼痛。与其他两组相比，局部加热方法显著提高了患者的体温，三组患者的发抖情况相似。

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引用次数: 0

Effect of different cold acclimation methods on the exercise capacity of mice in low-temperature environments

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2025.104050

Xue Geng , Zhihui Li , Chaoyi Qu , Yiwei Feng , Zhijian Rao , Changzhen Wang , Jiexiu Zhao

Objective

This study aimed to evaluate the effects of different cold acclimation strategies on exercise performance in male mice exposed to low-temperature environments.

Methods

Male mice were subjected to five distinct acclimation regimens over 8 weeks: immersion at 10 °C (10 °CI) or 20 °C (20 °CI), swimming at 10 °C (10 °CS), 20 °C (20 °CS), or 34 °C (34 °CS). During the first 2 weeks, the acclimation time progressively decreased from 30 min to 3 min per day, and the water temperatures were lowered from 34 °C to the target levels, followed by 6 weeks of consistent exposure. Body weight, food intake, and rectal temperature were monitored throughout the study. Post-acclimation assessments included low-temperature exhaustion exercise ability testing; 16 S rDNA sequencing of gut microbiota; and quantification of gene expression related to brown adipose thermogenesis, skeletal muscle synthesis, and degradation.

Results

(1) After 8 weeks of acclimation, neither serum adrenaline nor angiotensin II levels significantly increased in mice exposed to 10 °C or 20 °C water. (2) Cold acclimation extended the endurance time under low-temperature conditions, notably in the 20 °CI, 10 °CS, and 20 °CS groups.

(3) Compared with the control (C) group, the 20 °CI and 10 °CS groups showed significantly increased UCP1, IGF-1, AKT, and mTOR gene expression levels (P < 0.05). The expression levels of MAFbx and MuRF1 genes in the 10 °CS and 20 °CS groups significantly decreased compared with those in the C group (P < 0.05). (4) Compared with the C group, the 20 °CI, 10 °CS, and 20 °CS groups demonstrated significant changes in intestinal microbiota diversity. Specifically, the abundance of Akkermansia strains significantly increased in the 20 °CI and 10 °C S groups. The abundance of Ruminococcus and Prevotellaceae_UCG-001 significantly increased in the 20 °C S group.

Conclusion

Exercise in cold environments can activate genes related to heat production and skeletal muscle synthesis and increase the abundance of beneficial bacteria producing short-chain fatty acids, thereby modulating host metabolism, accelerating the formation of cold acclimation, and enhancing exercise capacity in low-temperature environments.

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引用次数: 0

Investigating the potential of geothermal heat pump and precision air supply system for heat stress abatement in dairy cattle barns 探讨地源热泵和精密送风系统在奶牛舍热应激缓解中的应用潜力。

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2024.104039

Yangyang Li , Ran Ju , Chongtao Liu , Xiuping Tao , Jianchao Song

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 (P < 0.05), with no significant difference between the GP and FS barns (P > 0.05). Compared to cows in the FS barn, those in the GP barn exhibited lower skin temperature, rectal temperature, and respiratory rate (P < 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.

在集约化养殖场，保持最佳的室内热环境对提高牲畜的福利和生产力至关重要。本文研究了地热热泵与精密送风系统（GHP-PAS）在某奶牛场奶牛降温中的应用。评价了GHP-PAS系统在缓解泌乳奶牛热应激方面的有效性，以及其能量性能和自由栏局部冷却效率。试验选用140头产乳荷斯坦奶牛，分为两组。一组饲养在装有GHP-PAS系统的仓房（GP仓房，n = 70），另一组饲养在装有常规风机喷水系统的仓房（FS仓房，n = 70）。结果表明：GP和FS仓内环境温度均低于仓外温度（p0.05）。与FS牲口棚的奶牛相比，GP牲口棚的奶牛表现出较低的皮肤温度、直肠温度和呼吸频率(P

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引用次数: 0

Individual variation in diurnal body temperature and foraging activity in overwintering black-capped chickadees (Poecile atricapillus)

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2025.104059

Deborah M. Hawkshaw , Jan J. Wijmenga , Kimberley J. Mathot

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 (Poecile atricapillus). 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.

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引用次数: 0

The role of life stage and season in critical thermal limits of carrion beetles

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2025.104063

Chloe F. Garfinkel , Christy M. McCain

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 Thanatophilus lapponicus (n = 111) and Thanatophilus coloradensis (n = 46). For winter and summer comparisons, we used adult T. lapponicus (n = 103). We detected no difference between larvae and adults in T. lapponicus 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 T. coloradensis 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 T. lapponicus 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.

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引用次数: 0

Is skin temperature associated with training load during preparatory period of a professional volleyball team?

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2024.104038

Thiago Seixas Duarte , João B. Ferreira-Júnior , Jeann C.G. Oliveira , Carlos M.A. Costa , Daniel B. Coelho , João C.B. Marins , Maurício G. Bara-Filho

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 < 0.001), as indicated by a significant reduction in recovery perception at the end of each week (F = 52.3, p < 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 < 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 < 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.

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引用次数: 0

Spawning is accompanied by increased thermal performance in blue mussels 蓝贻贝的产卵伴随着热性能的提高。

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2024.104018

Katharina Alter , Maria Constenla , Francesc Padrós , Inna M. Sokolova , Ana Born-Torrijos

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, Mytilus edulis, 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.

气候变化正在造成强度更大、发生频率更高的短期极端变暖。沿海生态系统工程师（如蓝贻贝）的繁殖和随后的招募可能会受到极端温度的影响，因为这些重要功能对非生物因素的短期变化时间非常敏感。我们将潮间带蓝贻贝（Mytilus edulis）置于10至29°C的热环境中，加热速率为生态相关的4°C/h。我们通过观察其产卵活动和分析其性腺组织的组织学切片来评估其生殖状态。此外，我们还监测了他们的心率和瓣膜张开行为，以确定他们的热性能。我们确定了三种产卵群体：具有成熟性腺但不释放配子的非产卵者，在热挑战之前释放成熟配子的产卵后产卵者，以及在热挑战期间释放成熟配子的活跃产卵者。在不同的温度下，活跃的产卵者的心率明显更高，与非产卵者或产卵后的人相比，他们的心率峰值分别高出3.9和3.2°C。与其他两个产卵群体相比，产卵后的群体在不同温度下的阀门间隙明显更窄。因此，对变暖的代谢反应在很大程度上取决于生殖状态，活跃的产卵者由于代谢增加而增加热应激，非产卵者表现出热诱导的代谢抑制，产卵后的产卵者采取减少间隙的节能策略。综合考虑，在反复出现的短期变暖事件期间产卵可能会增加死亡风险，并对未来气候中的当地生物多样性产生潜在影响。

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引用次数: 0

Hot air injures human alveolar epithelial cells through ERK1/2 signaling-mediated ferroptosis

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2025.104065

Ruihan Liu, Zhihui Wang, Qing Luo, Guanbin Song

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.

{"title":"Hot air injures human alveolar epithelial cells through ERK1/2 signaling-mediated ferroptosis","authors":"Ruihan Liu, Zhihui Wang, Qing Luo, 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}

引用次数: 0

Effects of heat stress on growth performance, physiological responses, and carcass traits in broilers 热应激对肉鸡生长性能、生理反应和胴体性状的影响。

IF 2.9 2区生物学 Q2 BIOLOGY

Journal of thermal biology

Pub Date : 2025-01-01 DOI: 10.1016/j.jtherbio.2024.103994

Hye Ran Kim , Pilnam Seong , Kuk-Hwan Seol , Jong-Eun Park , Hana Kim , Woncheoul Park , Jin Ho Cho , Sung Dae Lee

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 < 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 < 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 < 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.

高环境温度导致鸡的代谢变化、体重减轻和高死亡率，影响全世界的家禽生产。本试验旨在通过温湿指数（THI）评价热应激对肉鸡生长性能、生理反应、胴体和血液学性状的影响。试验选取200只17 ~ 31日龄的肉鸡，在热中性条件下(21℃；在相对湿度为60% （RH）的环境下处理3 d，然后进行14 d的试验处理。将肉鸡随机分为4组，每组大小相同，饲养在温度为67（21℃）；RH 60%)至84(33°C；RH 60%)。在遭受严重热应激（THI 84）的锅炉中，采食量（-30%）和体增重（-51%）下降(P

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引用次数: 0