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Purine derivatives excretion and urinary nitrogen losses as influenced by the source of dietary carbohydrates supplementation

Published online by Cambridge University Press:  24 November 2017

J. Balcells ,
M. Fondevila ,
J.A. Guada  and
J. A. Carriedo
J. Balcells
Affiliation:
Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Miguel Servet 177. 50013 Zaragoza, Spain
M. Fondevila
Affiliation:
Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Miguel Servet 177. 50013 Zaragoza, Spain
J.A. Guada
Affiliation:
Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Miguel Servet 177. 50013 Zaragoza, Spain
J. A. Carriedo
Affiliation:
Departamento de Producción Animal, Universidad de León, 24071 Leon, Spain
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Extract

Utilization of low quality roughages is limited fundamentally by the low energy cont and low DM intake when fed to the ruminant animal. Supplementation with concentrates can al improved energy supply although their inclusion can lead to a negative effect upon rough intake and ruminal cellulolitic activity. Urinary excretion of purine derivatives, urea and may constitute a suitable index to detect possible effects on rumen fermentation.

The objective of this study was to determine the effect of changes in rumen fermentat: upon urinary excretion of these compounds induced by dietary supplementation of straw v differents sources of carbohydrates.

Twelve Rasa Aragonesa ewes (44±0.45 Kg) were fed “ad libitum” with urea-supplemer barley straw and allocated at random to 3 groups of 4 animals. Each group was supplemented barley grain, sugar beet pulp and grass hay, respectively, at 4 levels of supplementation (: 300, 450 and 600 g/d) in a 4 x 4 latin square design. Each 42-d experimental period compr: 35 days of adjustment period followed by a 7 days measurement period.

Type
Rumen Metabolism
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 214
Copyright
Copyright © The British Society of Animal Production 1992

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References

Balcells, J., Guada, J. A., Castrillo, C. & Gasa, J. (1991). Urinary excretion of allantoin and allantoin precursors by sheep after different rates of purine infusion into the duodenum. J.Agric. Sci, Camb . 116, 309–317.Google Scholar
Young, E. G. & Conway, C. F. (1942) . On the estimation of allantoin by Rimini-Schriner reaction. J.Biol. Chem. 142, 839–852.CrossRefGoogle Scholar