Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden
Background: Free-ranging brown bears exhibit highly contrasting physiological states throughout the year. They hibernate 6 months of the year, experiencing a decrease in body temperature, heart rate, respiratory rate and metabolism. An increase in food consumption and the resulting weight gain (most...
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fthsinnlandet:oai:brage.inn.no:11250/2373579 2024-03-03T08:49:17+00:00 Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden Græsli, Anne Randi Evans, Alina L. Fahlman, Åsa Bertelsen, Mads Frost Blanc, Stéphane Arnemo, Jon Martin 2015 application/pdf http://hdl.handle.net/11250/2373579 https://doi.org/10.1186/s12917-015-0615-2 eng eng urn:issn:1746-6148 http://hdl.handle.net/11250/2373579 https://doi.org/10.1186/s12917-015-0615-2 brown bear Ursus arctos haematology biochemistry seasonality VDP::Agriculture and fishery disciplines: 900::Clinical veterinary science disciplines: 950 Journal article 2015 fthsinnlandet https://doi.org/10.1186/s12917-015-0615-2 2024-02-02T12:42:20Z Background: Free-ranging brown bears exhibit highly contrasting physiological states throughout the year. They hibernate 6 months of the year, experiencing a decrease in body temperature, heart rate, respiratory rate and metabolism. An increase in food consumption and the resulting weight gain (mostly through fat storage) prior to hibernation are also part of the brown bear’s annual cycle. Due to these physiological changes, haematological and biochemical variables vary dramatically throughout the year. Seasonal changes in 12 haematological and 34 biochemical variables were evaluated in blood samples collected from 40 free-ranging subadult brown bears (22 females, 18 males) immobilised in Sweden in winter (February-March), spring (April-May), and summer (June). Results: Higher levels of haemoglobin, haematocrit and red blood cell count, and a lower white blood cell count and mean cell volume was found during hibernation than in spring and summer. Lower values of the enzymes; aspartate aminotransferase (AST), alanine transaminase (ALT), alkaline phosphatase (AP), γ-glutamyl transpeptidase (GGT), glutamate dehydrogenase (GD) and amylase, and increased values of β-hydroxybutyrate (β-HBA) and blood lipids; triglycerides, cholesterol and free fatty acids, were present during hibernation compared to spring and summer. Conclusions: This study documents significant shifts in haematological and biochemical variables in samples collected from brown bears anaesthetised in winter (February-March) compared to in spring and summer (April-June), reflecting the lowered metabolic, renal and hepatic activity during hibernation. Lower values of enzymes and higher values of blood lipids during hibernation, likely reflect a lipid-based metabolism. Article in Journal/Newspaper Ursus arctos Høgskolen i Innlandet: Brage INN BMC Veterinary Research 11 1 |
institution |
Open Polar |
collection |
Høgskolen i Innlandet: Brage INN |
op_collection_id |
fthsinnlandet |
language |
English |
topic |
brown bear Ursus arctos haematology biochemistry seasonality VDP::Agriculture and fishery disciplines: 900::Clinical veterinary science disciplines: 950 |
spellingShingle |
brown bear Ursus arctos haematology biochemistry seasonality VDP::Agriculture and fishery disciplines: 900::Clinical veterinary science disciplines: 950 Græsli, Anne Randi Evans, Alina L. Fahlman, Åsa Bertelsen, Mads Frost Blanc, Stéphane Arnemo, Jon Martin Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden |
topic_facet |
brown bear Ursus arctos haematology biochemistry seasonality VDP::Agriculture and fishery disciplines: 900::Clinical veterinary science disciplines: 950 |
description |
Background: Free-ranging brown bears exhibit highly contrasting physiological states throughout the year. They hibernate 6 months of the year, experiencing a decrease in body temperature, heart rate, respiratory rate and metabolism. An increase in food consumption and the resulting weight gain (mostly through fat storage) prior to hibernation are also part of the brown bear’s annual cycle. Due to these physiological changes, haematological and biochemical variables vary dramatically throughout the year. Seasonal changes in 12 haematological and 34 biochemical variables were evaluated in blood samples collected from 40 free-ranging subadult brown bears (22 females, 18 males) immobilised in Sweden in winter (February-March), spring (April-May), and summer (June). Results: Higher levels of haemoglobin, haematocrit and red blood cell count, and a lower white blood cell count and mean cell volume was found during hibernation than in spring and summer. Lower values of the enzymes; aspartate aminotransferase (AST), alanine transaminase (ALT), alkaline phosphatase (AP), γ-glutamyl transpeptidase (GGT), glutamate dehydrogenase (GD) and amylase, and increased values of β-hydroxybutyrate (β-HBA) and blood lipids; triglycerides, cholesterol and free fatty acids, were present during hibernation compared to spring and summer. Conclusions: This study documents significant shifts in haematological and biochemical variables in samples collected from brown bears anaesthetised in winter (February-March) compared to in spring and summer (April-June), reflecting the lowered metabolic, renal and hepatic activity during hibernation. Lower values of enzymes and higher values of blood lipids during hibernation, likely reflect a lipid-based metabolism. |
format |
Article in Journal/Newspaper |
author |
Græsli, Anne Randi Evans, Alina L. Fahlman, Åsa Bertelsen, Mads Frost Blanc, Stéphane Arnemo, Jon Martin |
author_facet |
Græsli, Anne Randi Evans, Alina L. Fahlman, Åsa Bertelsen, Mads Frost Blanc, Stéphane Arnemo, Jon Martin |
author_sort |
Græsli, Anne Randi |
title |
Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden |
title_short |
Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden |
title_full |
Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden |
title_fullStr |
Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden |
title_full_unstemmed |
Seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (Ursus arctos) in Sweden |
title_sort |
seasonal variation in haematological and biochemical variables in free-ranging subadult brown bears (ursus arctos) in sweden |
publishDate |
2015 |
url |
http://hdl.handle.net/11250/2373579 https://doi.org/10.1186/s12917-015-0615-2 |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_relation |
urn:issn:1746-6148 http://hdl.handle.net/11250/2373579 https://doi.org/10.1186/s12917-015-0615-2 |
op_doi |
https://doi.org/10.1186/s12917-015-0615-2 |
container_title |
BMC Veterinary Research |
container_volume |
11 |
container_issue |
1 |
_version_ |
1792506484806909952 |