Urinary Purine Derivatives Excretion as a Method for Estimation of Rumen Microbial Protein Production in Swamp Buffaloes and Zebu Cattle
Prediction equations based on urinary purine derivatives (PD) excretion rate as an index to predict rumen microbial protein production have been developed for European cattle and sheep. However, there is evidence to suggest that those equations may not be applicable directly to tropical swamp buf...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10580/1/FP_2002_7_A.pdf |
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| Summary: | Prediction equations based on urinary purine derivatives (PD) excretion rate as an
index to predict rumen microbial protein production have been developed for
European cattle and sheep. However, there is evidence to suggest that those equations
may not be applicable directly to tropical swamp buffaloes (Bubalus bubalis) and zebu
cattle (Bos indicus). To establish similar equations for the above two species of
ruminant, five studies were conducted. In the first study, endogenous PD excretion
rate determined by fasting procedure for swamp buffaloes and the Malaysian
indegenous KK. cattle (zebu cattle) were 199 and 300 Ilmol/kgO.75 /day, respectively.
Urinary PD excretion rate per kg digestible organic matter intake (DOMI) for
buffaloes (8.19 mmol/kg DOMI) was significantly lower than that for KK. cattle
(15.45 mmol/kg DOMI). The second study examined the relationship between daily
urinary PD excretion (Y, mmol) and exogenous purine bases (PB) supply via duodenal
infusion (X, mmol/day). The relationship obtained were Y = O. I 2X+ 12.78 (r2= 0.45)
for buffaloes and Y = 0.85X + 7.15 (r2= 0.62) for KK. cattle, suggesting that 12% and
85% of the supplied exogenous purine were excreted in the urine of buffaloes and zebu cattle, respectively. In the third study, labelled [8_14C] uric acid marker was used
to test the hypothesis that the lower recovery rate of urinary PD in swamp buffaloes
was due to their higher recycling of plasma PD as compared to KK cattle. The
averaged non-renal PD loss of plasma PD for swamp buffaloes and KK cattle did not
differ significantly. |
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