A comparison of the excretion rate of endogenous purine derivatives in the urine of Bos indicus and Bos taurus steers

Bowen, M. K., Poppi, D. P., McLennan, S. R. and Doogan, V. J. (2006) A comparison of the excretion rate of endogenous purine derivatives in the urine of Bos indicus and Bos taurus steers. Australian Journal of Agricultural Research, 57 2: 173-177. doi:10.1071/AR05182


Author Bowen, M. K.
Poppi, D. P.
McLennan, S. R.
Doogan, V. J.
Title A comparison of the excretion rate of endogenous purine derivatives in the urine of Bos indicus and Bos taurus steers
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 2006
Sub-type Article (original research)
DOI 10.1071/AR05182
Volume 57
Issue 2
Start page 173
End page 177
Total pages 5
Editor Jenny C. Fegent
Place of publication Collingwood
Publisher Csiro Publishing
Collection year 2006
Language eng
Subject C1
300403 Animal Nutrition
630103 Beef cattle
Abstract Estimates of microbial crude protein (MCP) production by ruminants, using a method based on the excretion of purine derivatives in urine, require an estimate of the excretion of endogenous purine derivatives (PD) by the animal. Current methods allocate a single value to all cattle. An experiment was carried out to compare the endogenous PD excretion in Bos taurus and high-content B. indicus ( hereafter, B. indicus) cattle. Five Holstein - Friesian ( B. taurus) and 5 Brahman (> 75% B. indicus) steers ( mean liveweight 326 +/- 3.0 kg) were used in a fasting study. Steers were fed a low-quality buffel grass (Cenchrus ciliaris; 59.4 g crude protein/kg dry matter) hay at estimated maintenance requirements for 19 days, after which hay intake was incrementally reduced for 2 days and the steers were fasted for 7 days. The excretion of PD in urine was measured daily for the last 6 days of the fasting period and the mean represented the daily endogenous PD excretion. Excretion of endogenous PD in the urine of B. indicus steers was less than half that of the B. taurus steers ( 190 mu mol/kg W-0.75. day v. 414 mu mol/kg W-0.75. day; combined s.e. 37.2 mu mol/kg W-0.75. day; P< 0.001). It was concluded that the use of a single value for endogenous PD excretion is inappropriate for use in MCP estimations and that subspecies-specific values would improve precision.
Keyword rumen microbial protein
cattle
Fibrous Feeds
Ruminants
Cattle
Cows
Detergents
Infusion
Nitrogen
Protein
Rumen
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Wed, 15 Aug 2007, 09:40:35 EST