ArticleFrontiers in veterinary science2020
An Acute, Rather Than Progressive, Increase in Temperature-Humidity Index Has Severe Effects on Mortality in Laying Hens.
Article in Frontiers in veterinary science, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.
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Who cites it
25 citing papers in PubMed.
- Research note: Cosinor-based rhythmometry reveals how heat stress disrupts the circadian rhythm of core body temperature in broilers.Poultry science · 2026Article
- Article
- Environmental drivers of broiler carcass condemnation in humid subtropical regions: an exploratory study on the association of lagged climatic effects.Tropical animal health and production · 2026Article
- Compost fermented with thermophilic Bacillaceae reduces heat stress-induced mortality in laying hens through gut microbial modulation.Animal microbiome · 2026Article
- A Supervised Deep Learning Model Was Developed to Classify Nelore Cattle (Animals : an open access journal from MDPI · 2026Article
- Alleviation of Acute Heat Stress in Broiler Chickens by Dietary Supplementation of Polyphenols from Shredded, Steam-Exploded Pine Particles.Microorganisms · 2025Article
- Climate change impacts on livestock in Brazil.International journal of biometeorology · 2024Article
- Effects of Low-Pressure Systems on Temperature, Humidity, Egg Production, and Feed Utilization Efficiency in Large-Scale Poultry Houses during Summer.Animals : an open access journal from MDPI · 2024Article
- Effect of three different insect larvae on growth performance and antioxidant activity of thigh, breast, and liver tissues of chickens reared under mild heat stress.Tropical animal health and production · 2024Article
- Can eggshells indicate stressor exposure in free-range laying hens?Animal welfare (South Mimms, England) · 2024Article
- Thermal impacts on transcriptome of Pectoralis major muscle collected from commercial broilers, Thai native chickens and its crossbreeds.Animal bioscience · 2024Article
- Heat Stress Trends in Regions of Intensive Turkey Production in Germany-A Challenge in Times of Climate Change.Animals : an open access journal from MDPI · 2023Article
- Effect of dietary betaine supplementation on the liver transcriptome profile in broiler chickens under heat stress conditions.Animal bioscience · 2023Article
- Embryonic modulation through thermal manipulation and in ovo feeding to develop heat tolerance in chickens.Animal nutrition (Zhongguo xu mu shou yi xue hui) · 2023Review
- Assessing Indoor Climate Control in a Water-Pad System for Small-Scale Agriculture in Taiwan: A CFD Study on Fan Modes.Bioengineering (Basel, Switzerland) · 2023Article
- Dietary supplementation of solubles from shredded, steam-exploded pine particles modifies gut length and cecum microbiota in cyclic heat-stressed broilers.Poultry science · 2023Article
- Effects of gamma aminobutyric acid on performance, blood cell of broiler subjected to multi-stress environments.Animal bioscience · 2023Article
- Riding out the storm: depleted fat stores and elevated hematocrit in a small bodied endotherm exposed to severe weather.Conservation physiology · 2023Article
- Effects of Dietary Supplementation of Solubles from Shredded, Steam-Exploded Pine Particles on the Performance and Cecum Microbiota of Acute Heat-Stressed Broilers.Microorganisms · 2022Article
- Impacts of Air Velocity Treatments under Summer Conditions: Part II-Heavy Broiler's Behavioral Response.Animals : an open access journal from MDPI · 2022Article
Corrections and comments
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Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
This study was conducted to evaluate the effects of temperature-humidity index (THI) on the mortality and the panting rates in hens exposed to varying thermal environments. Hens were challenged with an acute elevation in THI in Experiment 1, where dry-bulb temperature and relative humidity were set at ~27°C and 56% at the beginning of the experiment and changed to 36°C and 45% at its conclusion, respectively. In Experiment 2, different groups of hens were exposed to a progressive increase in THI, with similar ranges to those used in the previous experiment. In Experiment 3, the hens used in Experiment 2 were again challenged by THI conditions, the intensity of which ranged between those used in the previous two experiments. In Experiment 4, panting rates were recorded under varying THI. In the last, plasma biochemical profiles were determined in blood taken from hens subjected to experimental conditions similar to those in Experiment 2. When THI was acutely elevated from 24.2° to 32.1°C within 1 h and then maintained over 4.5 h, no mortality was detected in the first hour, but exceeded 95% after 5 h, and reached 100% at 5.5 h. A gradual increase in THI to 31.2°C over 6 h did not result in mortality during the first 3 h. When THI was set below the conditions in Experiment 1 but above those in Experiment 2, mortality was 29% at 4 h, 75% at 5 h, and 79% at 8 h. However, no mortality was detected in their respective control groups. Panting was not observed under 25.3°C and was largely variable under 30°C. However, all hens exhibited panting exceeding 250 counts/min and 60% mortality at 34°C when heat stress continued for a duration of up to 280 min. In Experiment 5, high ambient THI resulted in significant reductions in plasma albumin, amylase and aspartate aminotransferase, compared with those in control group (
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