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Response of urinary purine derivatives to urea supplementation of sodium hydroxide treated straw

Published online by Cambridge University Press:  24 November 2017

J.A. Guada ,
J. Balcells ,
J. Gasa  and
A. de Vega
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Extract

Since in ruminants urinary excretion of purine derivatives is related to duodenal absorption of purines (Fujihara et al.1987;Giesecke et al.1984), it may be a valuable index to identify nutritive constraints limiting rumen fermentation and microbial synthesis.

In the present experiment, the response in the urinary excretion of purine derivatives to urea supplementation of a N deficient diet was studied to test the validity of the above assumption.

Five Rasa Aragonesa ewes rumen cannulated and 38, 9±2, 52 Kg mean live weight, were offered “ad libitum” OHNa treated barley straw (50 g/Kg DM) ground and pelleted.

Five experimental treatments including four levels of urea supplementation(6.5, 13, 19.5 and 26 g/d) plus a negative control were arranged in a 5x5 latin square design,allowing 14 days of adaptation between experimental periods.The urea was given by continuous infusion to the rumen at a flow rate of 0.92 ml/mn during 18 h per day starting after feeding.

Type
Ruminant Nutrition
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1990 , March 1990 , pp. 121
Copyright
Copyright © The British Society of Animal Production 1990

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References

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