Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment
Seasonal energy metabolism was investigated in young (2- to 3-year-old) muskoxen (Ovibos moschatus) during the winters of 1994 (JanuaryApril) and 1996 (January) and summer of 1995 (July and August). Energy expenditure (EE) increased 35%42% following a meal of chopped brome hay (Bromus inermis) and...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2003
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/z03-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-133 |
id |
crcansciencepubl:10.1139/z03-133 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/z03-133 2024-04-07T07:54:04+00:00 Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment Lawler, James P White, Robert G 2003 http://dx.doi.org/10.1139/z03-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-133 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 81, issue 9, page 1524-1538 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2003 crcansciencepubl https://doi.org/10.1139/z03-133 2024-03-08T00:37:37Z Seasonal energy metabolism was investigated in young (2- to 3-year-old) muskoxen (Ovibos moschatus) during the winters of 1994 (JanuaryApril) and 1996 (January) and summer of 1995 (July and August). Energy expenditure (EE) increased 35%42% following a meal of chopped brome hay (Bromus inermis) and declined as a double-exponential process over 8 h. The mean energy cost of eating (321 and 361 J·g dry matter 1 ) was lower in winter than in summer, and declined with body mass (BM) (r 2 = 0.58). The mean energy cost of standing was 21% (SE = 2.7%) higher than that of bedding. Prefeeding energy expenditure (EE p ) was 26% higher in summer than in winter. An endo genous heat increment, measured as EE p EE, at 7-8 h post feeding was lower (P < 0.001) in winter than in summer (39 and 58 kJ·kg BM 0.75 ·d 1 , respectively). Mean cumulative EE (minus activity costs) for 8 h post feeding was 124 (SE = 4) and 148 (SE = 4) kJ·kg BM 0.75 (P < 0.001) in winter and summer, respectively. Respiratory quotients (RQs) >1 were recorded during feeding in winter and a mean RQ of 0.9 was recorded in summer. Seasonal EE p , postfeeding EE, and RQ are consistent with a low cost of maintenance metabolism in winter and an increased requirement for productivity in summer. Article in Journal/Newspaper muskox ovibos moschatus Canadian Science Publishing Canadian Journal of Zoology 81 9 1524 1538 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Lawler, James P White, Robert G Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Seasonal energy metabolism was investigated in young (2- to 3-year-old) muskoxen (Ovibos moschatus) during the winters of 1994 (JanuaryApril) and 1996 (January) and summer of 1995 (July and August). Energy expenditure (EE) increased 35%42% following a meal of chopped brome hay (Bromus inermis) and declined as a double-exponential process over 8 h. The mean energy cost of eating (321 and 361 J·g dry matter 1 ) was lower in winter than in summer, and declined with body mass (BM) (r 2 = 0.58). The mean energy cost of standing was 21% (SE = 2.7%) higher than that of bedding. Prefeeding energy expenditure (EE p ) was 26% higher in summer than in winter. An endo genous heat increment, measured as EE p EE, at 7-8 h post feeding was lower (P < 0.001) in winter than in summer (39 and 58 kJ·kg BM 0.75 ·d 1 , respectively). Mean cumulative EE (minus activity costs) for 8 h post feeding was 124 (SE = 4) and 148 (SE = 4) kJ·kg BM 0.75 (P < 0.001) in winter and summer, respectively. Respiratory quotients (RQs) >1 were recorded during feeding in winter and a mean RQ of 0.9 was recorded in summer. Seasonal EE p , postfeeding EE, and RQ are consistent with a low cost of maintenance metabolism in winter and an increased requirement for productivity in summer. |
format |
Article in Journal/Newspaper |
author |
Lawler, James P White, Robert G |
author_facet |
Lawler, James P White, Robert G |
author_sort |
Lawler, James P |
title |
Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
title_short |
Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
title_full |
Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
title_fullStr |
Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
title_full_unstemmed |
Temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
title_sort |
temporal responses in energy expenditure and respiratory quotient following feeding in the muskox: influence of season on energy costs of eating and standing and an endogenous heat increment |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/z03-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-133 |
genre |
muskox ovibos moschatus |
genre_facet |
muskox ovibos moschatus |
op_source |
Canadian Journal of Zoology volume 81, issue 9, page 1524-1538 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z03-133 |
container_title |
Canadian Journal of Zoology |
container_volume |
81 |
container_issue |
9 |
container_start_page |
1524 |
op_container_end_page |
1538 |
_version_ |
1795670364026568704 |