Physiological and endocrinological changes in response to terminal heat stress in swine
Abstract
Chester White pigs weighing 65 to 70 kg bearing surgically implanted catheters were placed under a surgical plane of anesthesia and subjected to programmed increases in dry bulb and dew point temperatures from 27C at a rate of 5° per hour (70 to 80% relative humidity) until heart and respiratory action ceased. Changes in plasma adrenocorticotropin (ACTH), adrenocorticoids and growth hormone levels were measured during exposure to increasing temperature. Rectal temperature, heart and respiration rates, blood gases and levels of plasma glucose and free fatty acids were monitored. Severe alterations in physiological homeostatic mechanisms occurred at rectal temperature of 41.5C. The 40- to 20-min. period ante mortem was characterized by rapid increases in rectal temperature. Extreme thermal stress caused increased heart and respiration rates, as well as elevated levels of ACTH, adrenal corticoids and lactate.
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Respiratory rate, core body temperature, rectal temperature, skin temperature, feed, water intake and other physiological responses as well as production performance are affected by heat stress to varying levels.
“Respiratory rate, core body temperature, rectal temperature, skin temperature, feed, water intake and other physiological responses as well as production performance (pregnancy rate, delivery times, estrus time, etc.) are affected by heat stress to varying levels [24,25,26,27,28].”
From Modeling of Heat Stress in Sows—Part 1: Establishment of the Prediction Model for the Equivalent Temperature Index of the Sows (2021) · cites this paper as [24]
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Nutritional and physiological responses of growing pigs exposed to a diurnal pattern of heat stress
Patience, J. F., Umboh, J. F., Chaplin, R. K., & Nyachoti, C. M. (2005) · Livestock Production Science · doi:10.1016/j.livprodsci.2005.01.012 · Cited by 100 · see citing works
Cao, M., Zong, C., Wang, X., Teng, G., Zhuang, Y., & Lei, K. (2021) · Animals · doi:10.3390/ani11051472 · Cited by 19 · see citing works
- Authors
- Marple, D. N., Jones, D. J., Alliston, C. W., & Forrest, J. C.
- Affiliations
- Purdue University West Lafayette (US)
- Venue
- Journal of Animal Science
- Publisher
- Oxford University Press (OUP)
- Published
- 1974-07-01
- Volume
- 39
- Issue
- 1
- Pages
- 79-82
- ISSN
- 0021-8812 (ISSN-L)
- 1525-3163
- OpenAlex
- W2413776632
- Cited by
- 29
- References
- 0
- Citations by year
- 2025: 1 · 2023: 1 · 2021: 1 · 2017: 1 · 2016: 3 · 2014: 2 · 2013: 2
- FWCI
- 1.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Animal Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
- Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
- Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
- Keywords
- heat stress, pigs, terminal heat stress, ACTH, adrenal corticosteroids, growth hormone, rectal temperature, heart rate, respiratory rate, blood gases, plasma glucose, free fatty acids, lactate, thermoregulation, homeostasis
- MeSH terms
- Adrenocorticotropic Hormone, Animals, Blood Glucose, Body Temperature, Carbon Dioxide, Fatty Acids, Nonesterified, Female, Heart Rate, Hot Temperature, Hydrogen-Ion Concentration, Lactates, Oxygen, Respiration, Stress, Physiological, Swine, Swine Diseases
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