Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/28496 |
Resumo: | Climate change is seen as a significant threat to the sustainability of livestock production systems in many parts of the world, particularly in tropical regions. Extreme meteorological events can result in catastrophic production and death of livestock. Heat waves in particular can push vulnerable animals beyond their survival threshold limits. However, there is little information about buffalo responses to sudden changes in the thermal environment, specifically the heat waves. This study aimed to quantify the thermoregulatory and blood biochemical responses of heat-acclimatized buffaloes to a simulated heat wave. The experiment was designed in a climatic chamber with two periods of 4 days each. Twelve heat acclimated buffalo heifers aged 18 months were used. The climatic chamber environment was set as follows: 4-day period (P1) simulating the same weather conditions of a summer in humid tropical climate used as a baseline, with daily cycle with Ta and RH at 27 ± 1 °C and 76% from 0600 h to 1900 h and 24 ± 1 °C and 80% from 1900 h to 0600 h, and 4-day period (P2), simulating a daily heat wave cycle, from 0600 h to 1900 h with Ta and RH kept at 36 °C and 78% and from 1900 h to 0600 h, 27 °C and 74%. All animals were subject to both treatments and data were analyzed by a repeated measure analysis of variance, with post-hoc pooling comparison performed by Tukey’s test. In P2, there was observed a significant increase in respiratory frequency (p < 0.01), found four times in P1. The sweating rates were quite high in both periods; still, there were significant increases in P2 compared to P1 (p < 0.01) (4931 and 3201 g/m2/h, respectively). A slight but significant increase in rectal temperature was observed during the day (p < 0.01), with a rising until 1900 h. The simulated heat wave in P2 did not affect the values of the erythrogram or leukogram, excluding the significant reduction in K+ (p < 0.05). The low heat storage and the subsequent fast and full recovery of the thermal balance late afternoon appear to be related to the high sweating rate values. The massive sweating rate emphasizes its relevance in the maintenance of buffalo homeothermy. The absence of changes in hematological parameters has revealed the considerable physiological resilience of buffaloes toward simulated heat waves |
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Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat WavesEvaporative heat lossBuffaloesheat stressClimate change is seen as a significant threat to the sustainability of livestock production systems in many parts of the world, particularly in tropical regions. Extreme meteorological events can result in catastrophic production and death of livestock. Heat waves in particular can push vulnerable animals beyond their survival threshold limits. However, there is little information about buffalo responses to sudden changes in the thermal environment, specifically the heat waves. This study aimed to quantify the thermoregulatory and blood biochemical responses of heat-acclimatized buffaloes to a simulated heat wave. The experiment was designed in a climatic chamber with two periods of 4 days each. Twelve heat acclimated buffalo heifers aged 18 months were used. The climatic chamber environment was set as follows: 4-day period (P1) simulating the same weather conditions of a summer in humid tropical climate used as a baseline, with daily cycle with Ta and RH at 27 ± 1 °C and 76% from 0600 h to 1900 h and 24 ± 1 °C and 80% from 1900 h to 0600 h, and 4-day period (P2), simulating a daily heat wave cycle, from 0600 h to 1900 h with Ta and RH kept at 36 °C and 78% and from 1900 h to 0600 h, 27 °C and 74%. All animals were subject to both treatments and data were analyzed by a repeated measure analysis of variance, with post-hoc pooling comparison performed by Tukey’s test. In P2, there was observed a significant increase in respiratory frequency (p < 0.01), found four times in P1. The sweating rates were quite high in both periods; still, there were significant increases in P2 compared to P1 (p < 0.01) (4931 and 3201 g/m2/h, respectively). A slight but significant increase in rectal temperature was observed during the day (p < 0.01), with a rising until 1900 h. The simulated heat wave in P2 did not affect the values of the erythrogram or leukogram, excluding the significant reduction in K+ (p < 0.05). The low heat storage and the subsequent fast and full recovery of the thermal balance late afternoon appear to be related to the high sweating rate values. The massive sweating rate emphasizes its relevance in the maintenance of buffalo homeothermy. The absence of changes in hematological parameters has revealed the considerable physiological resilience of buffaloes toward simulated heat wavesMDPI2020-12-03T15:37:13Z2020-12-032020-04-21T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/28496http://hdl.handle.net/10174/28496porPereira, A.M.F.; Vilela, R.A.; Titto, C.G.; Leme-dos-Santos, T.M.C.; Geraldo, A.C.M.; Balieiro, J.C.C.; Calviello, R.F.; Birgel Junior, E.H.; Titto, E.A.L. Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves. Animals 2020, 10, 756.apereira@uevora.ptndndndndndndndnd379DOI: 10.3390/ani10050756Pereira, A.M.F.Vilela, R.Titto, C.Leme dos Santos, TGeraldo, A.Balieiro, J.Calviello, RBirgel Jr, ETitto, Einfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:24:32Zoai:dspace.uevora.pt:10174/28496Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:18:13.274202Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
title |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
spellingShingle |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves Pereira, A.M.F. Evaporative heat loss Buffaloes heat stress |
title_short |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
title_full |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
title_fullStr |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
title_full_unstemmed |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
title_sort |
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves |
author |
Pereira, A.M.F. |
author_facet |
Pereira, A.M.F. Vilela, R. Titto, C. Leme dos Santos, T Geraldo, A. Balieiro, J. Calviello, R Birgel Jr, E Titto, E |
author_role |
author |
author2 |
Vilela, R. Titto, C. Leme dos Santos, T Geraldo, A. Balieiro, J. Calviello, R Birgel Jr, E Titto, E |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Pereira, A.M.F. Vilela, R. Titto, C. Leme dos Santos, T Geraldo, A. Balieiro, J. Calviello, R Birgel Jr, E Titto, E |
dc.subject.por.fl_str_mv |
Evaporative heat loss Buffaloes heat stress |
topic |
Evaporative heat loss Buffaloes heat stress |
description |
Climate change is seen as a significant threat to the sustainability of livestock production systems in many parts of the world, particularly in tropical regions. Extreme meteorological events can result in catastrophic production and death of livestock. Heat waves in particular can push vulnerable animals beyond their survival threshold limits. However, there is little information about buffalo responses to sudden changes in the thermal environment, specifically the heat waves. This study aimed to quantify the thermoregulatory and blood biochemical responses of heat-acclimatized buffaloes to a simulated heat wave. The experiment was designed in a climatic chamber with two periods of 4 days each. Twelve heat acclimated buffalo heifers aged 18 months were used. The climatic chamber environment was set as follows: 4-day period (P1) simulating the same weather conditions of a summer in humid tropical climate used as a baseline, with daily cycle with Ta and RH at 27 ± 1 °C and 76% from 0600 h to 1900 h and 24 ± 1 °C and 80% from 1900 h to 0600 h, and 4-day period (P2), simulating a daily heat wave cycle, from 0600 h to 1900 h with Ta and RH kept at 36 °C and 78% and from 1900 h to 0600 h, 27 °C and 74%. All animals were subject to both treatments and data were analyzed by a repeated measure analysis of variance, with post-hoc pooling comparison performed by Tukey’s test. In P2, there was observed a significant increase in respiratory frequency (p < 0.01), found four times in P1. The sweating rates were quite high in both periods; still, there were significant increases in P2 compared to P1 (p < 0.01) (4931 and 3201 g/m2/h, respectively). A slight but significant increase in rectal temperature was observed during the day (p < 0.01), with a rising until 1900 h. The simulated heat wave in P2 did not affect the values of the erythrogram or leukogram, excluding the significant reduction in K+ (p < 0.05). The low heat storage and the subsequent fast and full recovery of the thermal balance late afternoon appear to be related to the high sweating rate values. The massive sweating rate emphasizes its relevance in the maintenance of buffalo homeothermy. The absence of changes in hematological parameters has revealed the considerable physiological resilience of buffaloes toward simulated heat waves |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-03T15:37:13Z 2020-12-03 2020-04-21T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/28496 http://hdl.handle.net/10174/28496 |
url |
http://hdl.handle.net/10174/28496 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Pereira, A.M.F.; Vilela, R.A.; Titto, C.G.; Leme-dos-Santos, T.M.C.; Geraldo, A.C.M.; Balieiro, J.C.C.; Calviello, R.F.; Birgel Junior, E.H.; Titto, E.A.L. Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves. Animals 2020, 10, 756. apereira@uevora.pt nd nd nd nd nd nd nd nd 379 DOI: 10.3390/ani10050756 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
MDPI |
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MDPI |
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reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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