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Urinary recovery of allantoin in normally fed steers

  • F. Herrera Gomez (a1), F. D. Deb Hovell (a1) (a2) and C. A. Sandoval Castro (a1)

Extract

Studies in the use of the purine derivatives technique in ruminants have been stimulated by the possible use of this technique as an estimator of the rumen microbial-N supplied to the host animal. The recovery factor influences the estimation of the total purines absorbed and therefore the microbial-N supply. The relationship between exogenous purine input and urinary excretion and recovery has been studied using cattle maintained with the intragastric infusion technique (Orskov et al., 1979). The urinary recovery of exogenous purines has been estimated to be 0.77-0.85 (Chen et al., 1990a, Verbic et al., 1990), and this relationship has been assumed to be applicable to normal feeding situations. To our knowledge there is no data to support or reject this approach. This study examined the urinary recovery of exogenous allantoin input in steers under normal feeding conditions.

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Chen, X. B., Hovell, F. D. DeB., Orskov, E. R. and Brown, D.A. 1990a. Excretion of purine derivatives by ruminants: effect of exogenous nucleic acid supply on purine derivative excretion by sheep. British Journal of Nutrition. 63: 131142.
Chen, X. B., Hovell, F. D. DeB., Orskov, E. R. and Brown, D.A. 1990b. Excretion of purine derivatives by ruminants: recycling of allantoin into the rumen via saliva and its fate in the gut. British Journal of Nutrition. 63: 197205.
Orskov, E. R., Grubb, D. A., Wenham, G. and Corrigall, W. 1979. The sustenance of growing and fattening ruminants by intragastric infusion of volatile fatty acids and protein. British Journal of Nutrition. 41: 553558.
Verbic, J., Chen, X. B., MacLeod, N. A., Orskov, E. R. 1990. Excretion of purine derivatives by ruminants, effect of microbial nucleic acid infusion on purine derivative excretion by steers. Journal of Agricultural Science, Cambridge. 114: 243248.

Urinary recovery of allantoin in normally fed steers

  • F. Herrera Gomez (a1), F. D. Deb Hovell (a1) (a2) and C. A. Sandoval Castro (a1)

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