Journal of Nutrition

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Journal of Nutrition Vol. 93 No. 4 December 1967, pp. 561-567
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Free Amino Acids, Ammonia and Urea Concentrations in the Blood Plasma of Starved Lambs1

Jane Leibholz and C. F. Cook2

M. C. Franklin Laboratory, Department of Animal Husbandry, University of Sydney, Camden, N. S. W., Australia

The effect of short periods of starvation on the free amino acid, ammonia and urea concentrations in blood plasma of Dorset Horn x Border Leicester-Merino lambs was studied in 3 age groups between 14 and 20 weeks of age. They were subjected to one of the following treatments:

1) fed a maintenance ration for 3 weeks;
2) fed a maintenance ration for 2 weeks and starved for 1 week; or
3) totally starved for 3 weeks. The concentration of free amino acids, ammonia and urea were determined in the blood plasma at the time of killing.
Starvation for 3 weeks resulted in a significantly lower concentration of total {alpha}-amino nitrogen in the plasma when compared with the control fed lambs. The individual amino acids which were significantly lower were threonine, glutamic acid, alanine, valine, isoleucine and leucine and also urea. The concentration of lysine in the blood plasma was significantly higher in the starved lambs.

1 This investigation was supported in part by grants made available by the Commonwealth Scientific and Industrial Research Organization, the Australian Cattle and Beef Research Committee and the Rural Credit Development Fund of the Reserve Bank of Australia.

2 Present address: Department of Animal Husbandry, University of Missouri, Columbia, Missouri.

Manuscript received 24 May 1967.




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