Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones
The extent of endocrine changes in response to various levels of heat stress and subsequent recovery is not well understood. Two cohorts of 12 Black Angus steers were housed in climate-controlled rooms (CCR) and subjected to three thermal periods: PreChallenge (5 d), Challenge (7 d) and Recovery (5...
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2025-01-01
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| author | Gene Wijffels Megan L. Sullivan Sally Stockwell Suzie Briscoe Roger Pearson Stephen T. Anderson Yutao Li Cintia C. de Melo Costa Russell McCulloch John B. Gaughan |
| author_facet | Gene Wijffels Megan L. Sullivan Sally Stockwell Suzie Briscoe Roger Pearson Stephen T. Anderson Yutao Li Cintia C. de Melo Costa Russell McCulloch John B. Gaughan |
| author_sort | Gene Wijffels |
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| description | The extent of endocrine changes in response to various levels of heat stress and subsequent recovery is not well understood. Two cohorts of 12 Black Angus steers were housed in climate-controlled rooms (CCR) and subjected to three thermal periods: PreChallenge (5 d), Challenge (7 d) and Recovery (5 d). PreChallenge and Recovery provided thermoneutral conditions. The Challenge simulated a strong heatwave. Finally, the steers were maintained in outdoor pens for 38 d. Rumen temperature (RumT), respiration rate (RR) and panting score (PS) were intensively measured in the CCR. Dry matter intake (DMI) was determined daily. The steers were bled most days, and a rectal temperature (RecT) was taken also. Plasma concentrations of TSH, prolactin, T3, T4, insulin, leptin and adiponectin were determined. During the Challenge, RumT, RecT, RR and PS rose; DMI was reduced. Plasma T3, T4 and adiponectin levels fell also. In Recovery, RumT, RecT, RR and PS fell below the PreChallenge mean. DMI partially recovered. T4 and adiponectin levels remained suppressed alongside lowered insulin. There were linear relationships between T3 concentration and THI, and T3 and T4 levels and DMI only. We highlight comparisons with previously reported metabolic hormone responses of grain-fed Black Angus steers to a moderate-heat-load challenge. |
| format | Article |
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| institution | Kabale University |
| issn | 2076-2615 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-e7932ff0b34b45d681d797d18be37b922025-01-24T13:18:17ZengMDPI AGAnimals2076-26152025-01-0115225110.3390/ani15020251Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic HormonesGene Wijffels0Megan L. Sullivan1Sally Stockwell2Suzie Briscoe3Roger Pearson4Stephen T. Anderson5Yutao Li6Cintia C. de Melo Costa7Russell McCulloch8John B. Gaughan9CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD 4067, AustraliaSchool of Agriculture and Food Sustainability, The University of Queensland, Gatton, QLD 4343, AustraliaCSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD 4067, AustraliaCSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD 4067, AustraliaCSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD 4067, AustraliaSchool of Biomedical Sciences, The University of Queensland, St Lucia, QLD 4067, AustraliaCSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD 4067, AustraliaFaculty of Agricultural and Veterinary Sciences, São Paulo State University (Unesp), Via de Acesso Paul Donato Castellane s/n, Jaboticabal 14884-900, SP, BrazilCSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD 4067, AustraliaSchool of Agriculture and Food Sustainability, The University of Queensland, Gatton, QLD 4343, AustraliaThe extent of endocrine changes in response to various levels of heat stress and subsequent recovery is not well understood. Two cohorts of 12 Black Angus steers were housed in climate-controlled rooms (CCR) and subjected to three thermal periods: PreChallenge (5 d), Challenge (7 d) and Recovery (5 d). PreChallenge and Recovery provided thermoneutral conditions. The Challenge simulated a strong heatwave. Finally, the steers were maintained in outdoor pens for 38 d. Rumen temperature (RumT), respiration rate (RR) and panting score (PS) were intensively measured in the CCR. Dry matter intake (DMI) was determined daily. The steers were bled most days, and a rectal temperature (RecT) was taken also. Plasma concentrations of TSH, prolactin, T3, T4, insulin, leptin and adiponectin were determined. During the Challenge, RumT, RecT, RR and PS rose; DMI was reduced. Plasma T3, T4 and adiponectin levels fell also. In Recovery, RumT, RecT, RR and PS fell below the PreChallenge mean. DMI partially recovered. T4 and adiponectin levels remained suppressed alongside lowered insulin. There were linear relationships between T3 concentration and THI, and T3 and T4 levels and DMI only. We highlight comparisons with previously reported metabolic hormone responses of grain-fed Black Angus steers to a moderate-heat-load challenge.https://www.mdpi.com/2076-2615/15/2/251feedlot cattlehyperthermiaallostasisthyroid hormonesleptinadiponectin |
| spellingShingle | Gene Wijffels Megan L. Sullivan Sally Stockwell Suzie Briscoe Roger Pearson Stephen T. Anderson Yutao Li Cintia C. de Melo Costa Russell McCulloch John B. Gaughan Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones Animals feedlot cattle hyperthermia allostasis thyroid hormones leptin adiponectin |
| title | Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones |
| title_full | Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones |
| title_fullStr | Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones |
| title_full_unstemmed | Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones |
| title_short | Stress and Strain: Differentiating the Responses to High and Moderate Heat Loads and Subsequent Recovery in Grain-Fed Feedlot Steers—Metabolic Hormones |
| title_sort | stress and strain differentiating the responses to high and moderate heat loads and subsequent recovery in grain fed feedlot steers metabolic hormones |
| topic | feedlot cattle hyperthermia allostasis thyroid hormones leptin adiponectin |
| url | https://www.mdpi.com/2076-2615/15/2/251 |
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