Article
Public, Environmental & Occupational Health
Yang Li, Yizhang Xia, Hongbin Zhu, Chunli Shi, Xianyan Jiang, Shijuan Ruan, Yue Wen, Xufang Gao, Wei Huang, Mingjiang Li, Rong Xue, Jianyu Chen, Li Zhang
Summary: There is an inverted J-shaped association between humidity and cardiovascular disease mortality. Low humidity significantly increases the risk of cardiovascular mortality, and susceptibility to humidity differs across populations with different demographic characteristics.
Article
Geosciences, Multidisciplinary
Dae Il Jeong, Bin Yu, Alex J. Cannon
Summary: The unprecedented 2021 heatwave in Western North America resulted in record-breaking human-perceived heat stress, with extreme heat stress increasing at a faster rate than extreme air temperature, both showing rapid increases in recent decades. In the future, a larger increase in extreme human-perceived heat stress is projected compared to air temperature, especially for events exceeding the levels observed in 2021.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
J. Van de Walle, O. Brousse, L. Arnalsteen, C. Brimicombe, D. Byarugaba, M. Demuzere, E. Jjemba, S. Lwasa, H. Misiani, G. Nsangi, F. Soetewey, H. Sseviiri, W. Thiery, R. Vanhaeren, B. F. Zaitchik, N. P. M. van Lipzig
Summary: Both climate change and rapid urbanization contribute to increased heat exposure in Kampala, Uganda. Using a network of low-cost sensors, the study analyzes temperature and humidity data to measure and explain intra-urban heat stress variation. Results show that heat stress is distributed unevenly across the city, with significant differences between the coolest and warmest stations. The study emphasizes the importance of urban greening in urban planning and the need to consider large intra-urban heat stress variations in heat action plans for tropical humid cities.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Mario A. Carvajal, Alberto J. Alaniz, Constanza Gutierrez-Gomez, Pablo M. Vergara, Veerasamy Sejian, Francisco Bozinovic
Summary: In recent decades, rising temperatures have severely affected livestock due to heat stress, with approximately 7% of the global cattle population currently exposed to dangerous heat conditions, projected to increase to about 48% by 2100. Tropical countries are expected to face an early increase in heat exposure, with a negative correlation between heat exposure and socioeconomic variables, highlighting the urgent need for effective abatement strategies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Gholamabbas Fallah Ghalhari, Hamidreza Heidari, Somayeh Farhang Dehghan, Mehdi Asghari
Summary: The study found that the Summer Simmer Index (SSI) is significantly correlated with the wet-bulb globe temperature (WBGT) and Humidex indices, with a higher correlation observed between SSI and Humidex. In the Mediterranean region, SSI showed less correlation with both WBGT and Humidex indices.
Article
Green & Sustainable Science & Technology
Suresh Chandra, Swatantra Kumar Dubey, Devesh Sharma, Bijon Kumer Mitra, Rajarshi Dasgupta
Summary: Heat waves are expected to intensify globally, particularly in areas with high exposure like India. This study analyzes the heat stress in Jaipur and investigates the city's land use changes and growth. The findings suggest that discomfort levels and difficulties in outdoor work and daily activities will increase in the future.
Article
Agriculture, Dairy & Animal Science
Nicolo P. P. Macciotta, Corrado Dimauro, Lorenzo Degano, Daniele Vicario, Alberto Cesarani
Summary: Heat stress during pregnancy can lead to physiological and metabolic changes in the offspring of animals, as a result of epigenetic reprogramming of the genome. This study investigated the transgenerational effects of heat stress in Italian Simmental cows. The birth months of the dam and granddam, as well as the temperature-humidity index during pregnancy, were found to affect breeding values for dairy traits in the daughters and granddaughters. The findings suggest an epigenetic inheritance due to environmental stressors in Italian Simmental cattle.
JOURNAL OF DAIRY SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
Ivan L. Campos, Tatiane C. S. Chud, Gerson A. Oliveira, Christine F. Baes, Angela Canovas, Flavio S. Schenkel
Summary: This study estimated the genetic parameters for heat tolerance of milk, fat, and protein yields in Canadian Holstein cows. The results showed an antagonistic relationship between production level and heat tolerance, but the correlation was moderate, indicating the possibility of selecting animals with high genetic merit for production and heat tolerance.
Article
Agronomy
Geqi Yan, Zhengxiang Shi, Hao Li
Summary: Detecting early signs of heat stress in dairy farming is crucial. This study identified critical THI thresholds for ST in dairy cows and evaluated the effects of lactation stage and number. The findings suggest that STave is more suitable for defining thresholds, with cheek STave being a primary variable for determining critical THI thresholds.
Article
Biology
Juan L. Morales-Cruz, Guadalupe Calderon-Leyva, Oscar Angel-Garcia, Juan M. Guillen-Munoz, Zurisaday Santos-Jimenez, Miguel Mellado, Luiz Gustavo Pessoa, Hugo Z. Guerrero-Gallego
Summary: This study evaluated the impact of the month of oocyte harvesting and the temperature-humidity index on oocyte number and quality, oocyte developmental competence, and total embryos produced from Holstein cows and heifers in an area with intense ambient temperatures. Results showed that severe heat stress adversely affected the number and quality of oocytes collected, oocyte developmental competence, and total embryo production from Holstein cows and heifers in this region.
Article
Environmental Sciences
C. Theusme, L. Avendano-Reyes, U. Macias-Cruz, A. Correa-Calderon, R. O. Garcia-Cueto, M. Mellado, L. Vargas-Villamil, A. Vicente-Perez
Summary: This study characterized two livestock regions in Mexico using bioclimatic indexes and predicted the impact of global warming on animal production systems. Results showed severe heat stress risk for dairy cattle, sheep, and pigs in the valley zone during summer, while the coastal zone had a lower impact.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Emilia Diaconescu, Housseyni Sankare, Kenneth Chow, Trevor Q. Murdock, Alex J. Cannon
Summary: The projected increase in the frequency and intensity of extreme heat events due to climate change leads to higher risks of heat-related illnesses and mortality. Public health systems need to be prepared to reduce the vulnerability of susceptible populations. To facilitate this, climate services have developed climate change projections for heat-stress indices. However, they face difficulties in computing these indices due to the difference in temporal resolution between the hourly data used and the daily or longer time steps in climate model outputs.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Ghasem Keikhosravi
Summary: The study evaluates the impact of heat waves on early snow melt in the Karkheh catchment of Iran, finding an increasing trend in heat wave frequency. Two dominant synoptic patterns, a Siberian high-pressure pattern and a Pakistan-Africa low-pressure pattern, significantly decrease snow cover area during specific months.
Article
Agriculture, Dairy & Animal Science
Paige L. Rockett, I. L. Campos, C. F. Baes, D. Tulpan, F. Miglior, F. S. Schenkel
Summary: This study aimed to evaluate the possibility of genetic evaluation for heat tolerance in Canadian dairy cattle. By using a repeatability test-day model with a heat stress function, the milk production capacity of first parity cows in different regions of Canada was evaluated under high environmental heat loads, and an antagonistic relationship was observed between sensitivity to heat stress and level of production.
JOURNAL OF DAIRY SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
S. Sterup Moore, A. Costa, M. Penasa, S. Callegaro, M. De Marchi
Summary: An edited data set of bulk and test-day records collected from 42 Holstein-dominated farms in the Veneto Region of Italy between 2019 and 2021 was used in this study. Results showed that heat stress conditions significantly lowered the quality of milk, with reduced fat and protein content, and increased somatic cell score and differential somatic cell count. Heat stress had a greater impact on test-day records than on bulk milk. The estimated farm-level economic losses due to reduced milk quality were comparable to losses resulting from reduced production. Furthermore, the maximum temperature-humidity index (MTHI) was found to be a more accurate indicator of heat stress experienced by cows.
JOURNAL OF DAIRY SCIENCE
(2023)