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The digestion of bulbils (Polygonum viviparum L.) and berries (Vaccinium myrtillus L. and Empetrum sp.) by captive ptarmigan (Lagopus mutus)

Published online by Cambridge University Press:  25 March 2008

R. Moss
Affiliation:
Institute of Terrestrial Ecology, Blackhall, Banchory, Kincardineshire AB3 3PS
J. A. Parkinson
Affiliation:
Institute of Terrestrial Ecology, Merlewood Research Station, Grange-over-Sands, Lancashire
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Abstract

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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.

Type
General Nutrition
Copyright
Copyright © The Nutrition Society 1975

References

Baldwin, B. C., Robinson, D. & Williams, R. T. (1960). Biochem. J. 76, 595.CrossRefGoogle Scholar
Block, R. J. & Weiss, K. W. (1956). Amino Acid Handbook. Springfield, Ill.: C. C. Thomas.Google Scholar
Bolton, W. (1957). J. Sci. Fd Agric. 8, 132.CrossRefGoogle Scholar
Gardarsson, A. & Moss, R. (1970). In Animal Populations in Relation to their Food Resources p. 47 [Watson, A., editor]. Oxford and Edinburgh: Blackwell Scientific Publications.Google Scholar
Gelting, P. (1937). Meddr Grønland 116, 111.Google Scholar
Martin, A. K. (1969). Proc. Nutr. Soc. 28, 65A.Google Scholar
Moss, R. (1967). Aspects of grouse nutrition. PhD Thesis, University of Aberdeen.Google Scholar
Moss, R. (1969). Avicult. Mag. 75, 256.Google Scholar
Moss, R. (1972). J. Wildl. Mgmt 36, 99.CrossRefGoogle Scholar
Moss, R. (1973). Condor 75, 293.CrossRefGoogle Scholar
Moss, R. & Parkinson, J. A. (1972). Br. J. Nutr. 27, 285.CrossRefGoogle Scholar
Tasaki, I. & Okumura, J. (1964). J. Nutr. 83, 34.CrossRefGoogle Scholar
Watson, A. (1964). Scott. Nat. 71, 60.Google Scholar
West, G. C. (1972). Comp. Biochem. Physiol. 42A, 867.CrossRefGoogle Scholar
Wilson, E. A. (1911). The Grouse in Health and in Disease, Being the Final Report of the Committee of Enquiry on Grouse Disease p. 67. London: Elder.Google Scholar