Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.)
The digestive efficiency in 4 captive walruses (2 males, 2 females) was determined. All 4 walruses were fed a diet of herring (Clupea harengus), and the adults (1 male, 1 female) were fed clams (Spisula sp.), for a total of 6 animal–diet combinations. The digestive coefficient for energy was the sam...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1992
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/z92-005 http://www.nrcresearchpress.com/doi/pdf/10.1139/z92-005 |
id |
crcansciencepubl:10.1139/z92-005 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/z92-005 2024-05-19T07:46:42+00:00 Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) Fisher, K. I. Stewart, R. E. A. Kastelein, R. A. Campbell, L. D. 1992 http://dx.doi.org/10.1139/z92-005 http://www.nrcresearchpress.com/doi/pdf/10.1139/z92-005 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 70, issue 1, page 30-36 ISSN 0008-4301 1480-3283 journal-article 1992 crcansciencepubl https://doi.org/10.1139/z92-005 2024-04-25T06:52:00Z The digestive efficiency in 4 captive walruses (2 males, 2 females) was determined. All 4 walruses were fed a diet of herring (Clupea harengus), and the adults (1 male, 1 female) were fed clams (Spisula sp.), for a total of 6 animal–diet combinations. The digestive coefficient for energy was the same for both diets ([Formula: see text] SD: 92.7 ± 2.1%; n = 6) but significantly (P = 0.02) higher in females (94.4 ± 1.2%, n = 3) than in males (91.0 ± 0.8%, n = 3). No age effects were found. The mean digestive coefficient of protein was 93.8% ± 1.8% (n = 6) and did not vary among diets or animals. The digestive coefficient for lipid was lower for the clam diet (73.2 ± 0.1%, n = 2) than for the herring diet (94.4 ± 2.3%, n = 4), but this is likely an artifact due to the low lipid content of the clams (5.8 ± 0.7%) and the influence of endogenous lipid loss. The approximate maintenance gross energy requirements for the 1200-kg nonpregnant, nonlactating adult walrus in captivity were 31 350 kcal∙day −1 (1 kcal = 4.18 kJ) or 155 kcal∙kg −0.75 ∙day −1 . Article in Journal/Newspaper Odobenus rosmarus walrus* Canadian Science Publishing Canadian Journal of Zoology 70 1 30 36 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The digestive efficiency in 4 captive walruses (2 males, 2 females) was determined. All 4 walruses were fed a diet of herring (Clupea harengus), and the adults (1 male, 1 female) were fed clams (Spisula sp.), for a total of 6 animal–diet combinations. The digestive coefficient for energy was the same for both diets ([Formula: see text] SD: 92.7 ± 2.1%; n = 6) but significantly (P = 0.02) higher in females (94.4 ± 1.2%, n = 3) than in males (91.0 ± 0.8%, n = 3). No age effects were found. The mean digestive coefficient of protein was 93.8% ± 1.8% (n = 6) and did not vary among diets or animals. The digestive coefficient for lipid was lower for the clam diet (73.2 ± 0.1%, n = 2) than for the herring diet (94.4 ± 2.3%, n = 4), but this is likely an artifact due to the low lipid content of the clams (5.8 ± 0.7%) and the influence of endogenous lipid loss. The approximate maintenance gross energy requirements for the 1200-kg nonpregnant, nonlactating adult walrus in captivity were 31 350 kcal∙day −1 (1 kcal = 4.18 kJ) or 155 kcal∙kg −0.75 ∙day −1 . |
format |
Article in Journal/Newspaper |
author |
Fisher, K. I. Stewart, R. E. A. Kastelein, R. A. Campbell, L. D. |
spellingShingle |
Fisher, K. I. Stewart, R. E. A. Kastelein, R. A. Campbell, L. D. Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) |
author_facet |
Fisher, K. I. Stewart, R. E. A. Kastelein, R. A. Campbell, L. D. |
author_sort |
Fisher, K. I. |
title |
Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) |
title_short |
Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) |
title_full |
Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) |
title_fullStr |
Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) |
title_full_unstemmed |
Apparent digestive efficiency in walruses ( Odobenus rosmarus) fed herring ( Clupea harengus) and clams ( Spisula sp.) |
title_sort |
apparent digestive efficiency in walruses ( odobenus rosmarus) fed herring ( clupea harengus) and clams ( spisula sp.) |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/z92-005 http://www.nrcresearchpress.com/doi/pdf/10.1139/z92-005 |
genre |
Odobenus rosmarus walrus* |
genre_facet |
Odobenus rosmarus walrus* |
op_source |
Canadian Journal of Zoology volume 70, issue 1, page 30-36 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z92-005 |
container_title |
Canadian Journal of Zoology |
container_volume |
70 |
container_issue |
1 |
container_start_page |
30 |
op_container_end_page |
36 |
_version_ |
1799486933369356288 |