Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus)
At birth reindeer calves often are exposed to sub‐zero ambient temperatures ( T a ) sometimes even combined with wind and precipitation. The resting metabolism was measured in three different age groups (1, 7 and 14 days old) at T a 's of –20, –5, 10 and 20 o C. Resting metabolism in the thermo...
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crwiley:10.1111/j.1748-1716.1985.tb07580.x 2024-09-30T14:41:42+00:00 Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) MARKUSSEN, K. A. ROGNMO, A. BLIX, A. S. 1985 http://dx.doi.org/10.1111/j.1748-1716.1985.tb07580.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-1716.1985.tb07580.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-1716.1985.tb07580.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Acta Physiologica Scandinavica volume 123, issue 2, page 215-220 ISSN 0001-6772 1365-201X journal-article 1985 crwiley https://doi.org/10.1111/j.1748-1716.1985.tb07580.x 2024-09-05T05:03:51Z At birth reindeer calves often are exposed to sub‐zero ambient temperatures ( T a ) sometimes even combined with wind and precipitation. The resting metabolism was measured in three different age groups (1, 7 and 14 days old) at T a 's of –20, –5, 10 and 20 o C. Resting metabolism in the thermoneutral zone decreased from 5.1 W‐kg ‐1 at day 1 and 7 to 4.8 W‐kg ‐1 at day 14. At day 1 apparent lower critical temperature ( T Ic ) was 11 o C, while at day 7 it was 7.7 o C and at day 14 73 o C, but total body conductance continued to decrease below apparent T Ic . At T a of – 5 and – 20 o C total body conductance was: 0.77 and 0.72 W‐ o C ‐1 at day 1, 0.98 and 0.92 W o C ‐1 at day 7, r.08 and 0.91 W o C ‐1 at day 14, respectively. Thermal conductance of pelt samples from the trunk was determined in vitro at different combinations of windspeed, T a and wetness. The conductance of dry fur increased from 5.9 to 11.8 W‐m ‐2 ‐ o C ‐1 at a windspeed of o and 10 m s ‐1 , respectively, as compared to 28.7 Wm ‐2 o C ‐1 when wetted without wind. Newborn reindeer calves seem to be heavily dependant on non‐shivering thermogenesis in brown adipose tissue for their cold defence since deep body temperature in a calf subjected to propranolol infusion when exposed to a T a of – 25 o C in combination with a 10 m s ‐1 windspeed increased its cooling rate five times. Article in Journal/Newspaper Rangifer tarandus Wiley Online Library Acta Physiologica Scandinavica 123 2 215 220 |
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English |
description |
At birth reindeer calves often are exposed to sub‐zero ambient temperatures ( T a ) sometimes even combined with wind and precipitation. The resting metabolism was measured in three different age groups (1, 7 and 14 days old) at T a 's of –20, –5, 10 and 20 o C. Resting metabolism in the thermoneutral zone decreased from 5.1 W‐kg ‐1 at day 1 and 7 to 4.8 W‐kg ‐1 at day 14. At day 1 apparent lower critical temperature ( T Ic ) was 11 o C, while at day 7 it was 7.7 o C and at day 14 73 o C, but total body conductance continued to decrease below apparent T Ic . At T a of – 5 and – 20 o C total body conductance was: 0.77 and 0.72 W‐ o C ‐1 at day 1, 0.98 and 0.92 W o C ‐1 at day 7, r.08 and 0.91 W o C ‐1 at day 14, respectively. Thermal conductance of pelt samples from the trunk was determined in vitro at different combinations of windspeed, T a and wetness. The conductance of dry fur increased from 5.9 to 11.8 W‐m ‐2 ‐ o C ‐1 at a windspeed of o and 10 m s ‐1 , respectively, as compared to 28.7 Wm ‐2 o C ‐1 when wetted without wind. Newborn reindeer calves seem to be heavily dependant on non‐shivering thermogenesis in brown adipose tissue for their cold defence since deep body temperature in a calf subjected to propranolol infusion when exposed to a T a of – 25 o C in combination with a 10 m s ‐1 windspeed increased its cooling rate five times. |
format |
Article in Journal/Newspaper |
author |
MARKUSSEN, K. A. ROGNMO, A. BLIX, A. S. |
spellingShingle |
MARKUSSEN, K. A. ROGNMO, A. BLIX, A. S. Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) |
author_facet |
MARKUSSEN, K. A. ROGNMO, A. BLIX, A. S. |
author_sort |
MARKUSSEN, K. A. |
title |
Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) |
title_short |
Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) |
title_full |
Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) |
title_fullStr |
Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) |
title_full_unstemmed |
Some aspects of thermoregulation in newborn reindeer calves (Rangifer tarandus tarandus) |
title_sort |
some aspects of thermoregulation in newborn reindeer calves (rangifer tarandus tarandus) |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1748-1716.1985.tb07580.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-1716.1985.tb07580.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-1716.1985.tb07580.x |
genre |
Rangifer tarandus |
genre_facet |
Rangifer tarandus |
op_source |
Acta Physiologica Scandinavica volume 123, issue 2, page 215-220 ISSN 0001-6772 1365-201X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-1716.1985.tb07580.x |
container_title |
Acta Physiologica Scandinavica |
container_volume |
123 |
container_issue |
2 |
container_start_page |
215 |
op_container_end_page |
220 |
_version_ |
1811644161843003392 |