The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus )
1. The digestion of three foods favoured by ptarmigan ( Lagopus mutus ) in the wild was studied using captive birds 2. Bulbils of Polygonum viviparum L. were a good source of metabolizable energy, protein and phosphorus, but were deficient in sodium. Berries of Vaccinium myrtillus L. were the most d...
Published in: | British Journal of Nutrition |
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Language: | English |
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Cambridge University Press (CUP)
1975
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Online Access: | http://dx.doi.org/10.1079/bjn19750024 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0007114575001201 |
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crcambridgeupr:10.1079/bjn19750024 2023-05-15T17:06:25+02:00 The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) Moss, R. Parkinson, J. A. 1975 http://dx.doi.org/10.1079/bjn19750024 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0007114575001201 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms British Journal of Nutrition volume 33, issue 2, page 197-206 ISSN 0007-1145 1475-2662 Nutrition and Dietetics Medicine (miscellaneous) journal-article 1975 crcambridgeupr https://doi.org/10.1079/bjn19750024 2022-11-07T16:24:15Z 1. The digestion of three foods favoured by ptarmigan ( Lagopus mutus ) in the wild was studied using captive birds 2. Bulbils of Polygonum viviparum L. were a good source of metabolizable energy, protein and phosphorus, but were deficient in sodium. Berries of Vaccinium myrtillus L. were the most digestible of the three foods, contained enough protein and P for maintenance, but were probably deficient in Na. A diet of Empetrum sp. berries caused the birds to be in negative nitrogen and P balance, but provided adequate Na. Both species of berries were rich sources of soluble carbohydrate 3. In the wild, ptarmigan eat a mixed diet, which presumably provides adequate Na, protein and P 4. The relative proportions of the various end-products of N metabolism varied according to the protein content of the food. With the diet of Vaccinium berries (11 g N/kg dry matter) roughly equal amounts of ammonium salts and urates were excreted. With Polygonum bulbils (29 g N/kg dry matter) the quantities of ammonium salts and urates excreted were similar to those with Vaccinium berries, but some urea was also excreted and about half the N in the birds' droppings was in an unidentified form 5. When eating Empetrum berries, ptarmigan digested lignin and tannins and excreted ornithurates. The benzoic acid moiety of the ornithuric acid molecule may have been derived partly from the digested lignin and tannins. Article in Journal/Newspaper Lagopus mutus Polygonum viviparum Cambridge University Press (via Crossref) British Journal of Nutrition 33 2 197 206 |
institution |
Open Polar |
collection |
Cambridge University Press (via Crossref) |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Nutrition and Dietetics Medicine (miscellaneous) |
spellingShingle |
Nutrition and Dietetics Medicine (miscellaneous) Moss, R. Parkinson, J. A. The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) |
topic_facet |
Nutrition and Dietetics Medicine (miscellaneous) |
description |
1. The digestion of three foods favoured by ptarmigan ( Lagopus mutus ) in the wild was studied using captive birds 2. Bulbils of Polygonum viviparum L. were a good source of metabolizable energy, protein and phosphorus, but were deficient in sodium. Berries of Vaccinium myrtillus L. were the most digestible of the three foods, contained enough protein and P for maintenance, but were probably deficient in Na. A diet of Empetrum sp. berries caused the birds to be in negative nitrogen and P balance, but provided adequate Na. Both species of berries were rich sources of soluble carbohydrate 3. In the wild, ptarmigan eat a mixed diet, which presumably provides adequate Na, protein and P 4. The relative proportions of the various end-products of N metabolism varied according to the protein content of the food. With the diet of Vaccinium berries (11 g N/kg dry matter) roughly equal amounts of ammonium salts and urates were excreted. With Polygonum bulbils (29 g N/kg dry matter) the quantities of ammonium salts and urates excreted were similar to those with Vaccinium berries, but some urea was also excreted and about half the N in the birds' droppings was in an unidentified form 5. When eating Empetrum berries, ptarmigan digested lignin and tannins and excreted ornithurates. The benzoic acid moiety of the ornithuric acid molecule may have been derived partly from the digested lignin and tannins. |
format |
Article in Journal/Newspaper |
author |
Moss, R. Parkinson, J. A. |
author_facet |
Moss, R. Parkinson, J. A. |
author_sort |
Moss, R. |
title |
The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) |
title_short |
The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) |
title_full |
The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) |
title_fullStr |
The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) |
title_full_unstemmed |
The digestion of bulbils ( Polygonum viviparum L. ) and berries ( Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan ( Lagopus mutus ) |
title_sort |
digestion of bulbils ( polygonum viviparum l. ) and berries ( vaccinium myrtillus l. and empetrum sp.) by captive ptarmigan ( lagopus mutus ) |
publisher |
Cambridge University Press (CUP) |
publishDate |
1975 |
url |
http://dx.doi.org/10.1079/bjn19750024 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0007114575001201 |
genre |
Lagopus mutus Polygonum viviparum |
genre_facet |
Lagopus mutus Polygonum viviparum |
op_source |
British Journal of Nutrition volume 33, issue 2, page 197-206 ISSN 0007-1145 1475-2662 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1079/bjn19750024 |
container_title |
British Journal of Nutrition |
container_volume |
33 |
container_issue |
2 |
container_start_page |
197 |
op_container_end_page |
206 |
_version_ |
1766061550105264128 |