Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups
Three ringed seal ( Phoca hispida ) pups were used to calculate water flux and milk intake, based on mass increase and dilution of injected tritiated water. Biological half life of tritium in ringed seal pups was 130 ± 17 h (mean ± S.D.). The plateau level of the isotope indicating equilibrium with...
Published in: | Journal of Zoology |
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Language: | English |
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1992
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Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1992.tb04441.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1992.tb04441.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1992.tb04441.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1992.tb04441.x |
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crwiley:10.1111/j.1469-7998.1992.tb04441.x 2024-09-30T14:41:20+00:00 Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups Lydersen, C. Hammill, M. O. Ryg, M. S. 1992 http://dx.doi.org/10.1111/j.1469-7998.1992.tb04441.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1992.tb04441.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1992.tb04441.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1992.tb04441.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 228, issue 3, page 361-369 ISSN 0952-8369 1469-7998 journal-article 1992 crwiley https://doi.org/10.1111/j.1469-7998.1992.tb04441.x 2024-09-05T05:05:22Z Three ringed seal ( Phoca hispida ) pups were used to calculate water flux and milk intake, based on mass increase and dilution of injected tritiated water. Biological half life of tritium in ringed seal pups was 130 ± 17 h (mean ± S.D.). The plateau level of the isotope indicating equilibrium with the body water was, in all cases (N = 8), reached before the first blood sample was collected after 0·5 h. Daily water flux in the pups was 62·9 ± 21·5 ml kg ‐1 . Estimated daily milk intake of 1103 ± 388 ml milk resulted in a mass increase of 386 ± 104 g. Neonates had a fat content of 4·75%, and a water content of 70·1% (N = 3). Corresponding figures for a pup close to weaning were 36·5% and 46·3%. Isotope dilution calculations of body water gave an overestimate of 1·6% compared with body water content from desiccation. Ringed seal milk was found to contain 38·1% fat, 9·9% protein, 2·3% lactose and 1% ash. Article in Journal/Newspaper Phoca hispida ringed seal Wiley Online Library Journal of Zoology 228 3 361 369 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Three ringed seal ( Phoca hispida ) pups were used to calculate water flux and milk intake, based on mass increase and dilution of injected tritiated water. Biological half life of tritium in ringed seal pups was 130 ± 17 h (mean ± S.D.). The plateau level of the isotope indicating equilibrium with the body water was, in all cases (N = 8), reached before the first blood sample was collected after 0·5 h. Daily water flux in the pups was 62·9 ± 21·5 ml kg ‐1 . Estimated daily milk intake of 1103 ± 388 ml milk resulted in a mass increase of 386 ± 104 g. Neonates had a fat content of 4·75%, and a water content of 70·1% (N = 3). Corresponding figures for a pup close to weaning were 36·5% and 46·3%. Isotope dilution calculations of body water gave an overestimate of 1·6% compared with body water content from desiccation. Ringed seal milk was found to contain 38·1% fat, 9·9% protein, 2·3% lactose and 1% ash. |
format |
Article in Journal/Newspaper |
author |
Lydersen, C. Hammill, M. O. Ryg, M. S. |
spellingShingle |
Lydersen, C. Hammill, M. O. Ryg, M. S. Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups |
author_facet |
Lydersen, C. Hammill, M. O. Ryg, M. S. |
author_sort |
Lydersen, C. |
title |
Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups |
title_short |
Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups |
title_full |
Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups |
title_fullStr |
Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups |
title_full_unstemmed |
Water flux and mass gain during lactation in free‐living ringed seal ( Phoca hispida) pups |
title_sort |
water flux and mass gain during lactation in free‐living ringed seal ( phoca hispida) pups |
publisher |
Wiley |
publishDate |
1992 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1992.tb04441.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1992.tb04441.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1992.tb04441.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1992.tb04441.x |
genre |
Phoca hispida ringed seal |
genre_facet |
Phoca hispida ringed seal |
op_source |
Journal of Zoology volume 228, issue 3, page 361-369 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1992.tb04441.x |
container_title |
Journal of Zoology |
container_volume |
228 |
container_issue |
3 |
container_start_page |
361 |
op_container_end_page |
369 |
_version_ |
1811643738996342784 |