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Digestion and nitrogen conservation in cattle and buffaloes given rice straw with or without molasses

Published online by Cambridge University Press:  27 March 2009

N. Abdullah ,
J. V. Nolan ,
M. Mahyuddin  and
S. Jalaludin
N. Abdullah
Affiliation:
Department of Biochemistry and Microbiology, Universiti Pertanian Malaysia, Serdang 43400, Selangor, Malaysia
J. V. Nolan
Affiliation:
Department of Biochemistry, Microbiology and Nutrition, Armidale 2351, NSW, Australia
M. Mahyuddin
Affiliation:
Department of Animal Science, Universiti Pertanian Malaysia, Serdang 43400, Selangor, Malaysia
S. Jalaludin
Affiliation:
Department of Animal Science, Universiti Pertanian Malaysia, Serdang 43400, Selangor, Malaysia
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Summary

Using [14C]urea, the rates of urea synthesis in the body, excretion in the urine and degradation in the rumen and gut were compared in 20-month-old Kedah-Kelantan cattle and swamp buffaloes at the Universiti Pertanian Malaysia, Malaysia in 1987. The animals were fed rice straw or straw plus molasses.

The buffaloes were heavier than the cattle and had higher straw and nitrogen intakes, although these intakes did not differ significantly when compared on the basis of metabolic liveweight (W0·75).

Rumen pH in the buffaloes was lower, whereas ammonia and total volatile fatty acid (VFA) concentrations were higher than in the cattle. Total VFA concentration was lower when the diet contained molasses. Rumen bicarbonate kinetics did not differ significantly between species or diets.

There were no significant differences between species in plasma urea concentration, or urea synthesis rate per W0·75, or endogenous urea movement into the rumen per W0·75.

The buffaloes consumed more water and discharged twice as much urine as the cattle, but nevertheless excreted less urea per W0·75, and a larger fraction of their endogenously produced urea entered the gut. Movement of urea into the rumen per W0·75 was lower when the diet contained molasses.

Type
Animals
Information
The Journal of Agricultural Science , Volume 119 , Issue 2 , October 1992 , pp. 255 - 263
Copyright
Copyright © Cambridge University Press 1992

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