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Nitrogen metabolism in the ovine stomach: 3. Urea in the abomasal secretions

Published online by Cambridge University Press:  27 March 2009

C. J. F. Harrop  and
A. T. Phillipson
C. J. F. Harrop
Affiliation:
Department of Veterinary Clinical Studies, School of Veterinary Medicine, Madingley Road, Cambridge
A. T. Phillipson
Affiliation:
Department of Veterinary Clinical Studies, School of Veterinary Medicine, Madingley Road, Cambridge
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Summary

The effects of various stimuli on the secretion of urea and ammonia in gastric juice were examined in sheep with innervated pouches in the fundic and pyloric regions of the abomasum.

Histamine, pentagastrin and feeding increased the rate of secretion and acidity of fundic juice, but had little or no effect on the concentration of urea and ammonia. The increased output of gastric juice meant that more urea and ammonia entered the abomasum in the secretions. The rate of secretion of pyloric juice was also increased by histamine and feeding, and there was an indication that histamine increased the concentration of urea + ammonia in the secretions after a period of starvation.

Intravenous injections of urea increased the concentration of ammonia in abomasal liquor. This was due in part to higher levels of ammonia in ruminal liquor passing to the abomasum, and to higher concentrations of urea + ammonia in gastric juice. The concentration of urea + ammonia in fundic juice was 45·0±1·1% of the plasma urea level, and 60·4±1·5% in the pyloric secretions.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 83 , Issue 2 , October 1974 , pp. 237 - 247
Copyright
Copyright © Cambridge University Press 1974

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References

REFERENCES

Ash, R. W. (1961). Acid secretion by the abomasura and its relation to the flow of food material in the sheep. Journal of Physiology 156, 93–111.CrossRefGoogle Scholar
Clarke, E. M. W., Ellinger, G. M. & Phillipson, A. T. (1966). The influence of diet on the nitrogenous components passing to the duodenum and through the lower ileum of sheep. Proceedings of the Royal Society London, Series B 166, 63–79.Google Scholar
Conway, E. J. (1957). Microdiffusion Analysis and Volumetric Error. London: Crosby Lockwood and Son Ltd.Google Scholar
Gray, F. V., Pilgrim, A. F. & Weller, R. A. (1958). The digestion of foodstuffs in the stomach of the sheep and the passage of digesta through its compartments. 2. Nitrogenous compounds. British Journal of Nutrition, Cambridge 12, 413–20.Google Scholar
Gregory, R. A., Hallenbeck, G. A. & Code, C. F. (1942). A modification of the method of Hollander and Jemerin for making Pavlov pouches. Proceedings of the Society for Experimental Biology and Medicine 49, 400–403.Google Scholar
Grosskopf, J. F. W. (1954). A simplified operation for the preparation of abomasal pouches in calves. Journal of the South African Veterinary Medical Association 25, 59–62.Google Scholar
Harrison, F. A. & Hill, K. J. (1962). Digestive secretions and the flow of digesta along the duodenum of the sheep. Journal of Physiology 162, 225–43.Google Scholar
Harrop, C. J. F. (1974). Nitrogen metabolism in the ovine stomach. 2. Factors influencing ruminal ammonia levels in sheep maintained on different diets. Journal of Agricultural Science, Cambridge 82, 409–17.CrossRefGoogle Scholar
Harrop, C. J. F. & Phillipson, A. T. (1971). The effects of diet and pentagastrin on the influx of urea into the rumen of sheep. Proceedings of the Nutrition Society, Cambridge 30, 3A.Google Scholar
Harrop, C. J. F. & Phillipson, A. T. (1974). Nitrogen metabolism in the ovine stomach. 1. The transfer of urea from the blood to the rumen. Journal of Agricultural Science, Cambridge 82, 399–408.Google Scholar
Hill, K. J. (1955). Continuous gastric secretion in the ruminant. Quarterly Journal of Experimental Physiology, London 40, 32–39.Google Scholar
Hill, K. J. (1960). Abomasal secretion in the sheep. Journal of Physiology 154, 115–32.CrossRefGoogle ScholarPubMed
Hill, K. J. (1961). Digestive secretions in the ruminant. In Digestive Physiology and Nutrition of the Ruminant (ed. Lewis, D.), ch. 3. London: Buttorworths.Google Scholar
Hogan, J. P. (1957). The transport of ammonia from the digestive tract of the sheep. Ph.D. Thesis, University of Aberdeen.Google Scholar
Hogan, J. P. & Weston, R. H. (1967). The digestion of chopped and ground roughages by sheep. II. The digestion of nitrogen and some carbohydrate fractions in the stomach and intestines. Australian Journal of Agricultural Research 18, 803–19.Google Scholar
Houpt, T. R. (1959). Utilization of blood urea in ruminants. American Journal of Physiology 197, 115–20.Google Scholar
Kornberg, H. L. & Davies, R. E. (1955). Gastric urease. Physiological Reviews 35, 169–77.Google Scholar
Kornberg, H. L., Davies, R. E. & Wood, D. R. (1954). The activity and function of gastric urease in the cat. Biochemical Journal 56, 363–72.Google Scholar
Masson, M. J. & Phillipson, A. T. (1952). The composition of the digesta leaving the abomasum of sheep. Journal of Physiology 116, 98–111.CrossRefGoogle ScholarPubMed
McDonald, I. W. (1948). Studies in the metabolism of sheep with special reference to the digestion of protein. Ph.D. Thesis, University of Cambridge.Google Scholar
McLeay, L. M. & Titchen, D. A. (1970). Abomasal secretory responses to teasing with food and feeding in the sheep. Journal of Physiology 206, 605–28.Google Scholar
Somers, M. (1961). Factors influencing the secretion of nitrogen in sheep saliva. I–IV. Australian Journal of Experimental Biology and Medical Science 39, 111–56.Google Scholar
Vakley, H. (1962). Practical Clinical Biochemistry, 3rd ed.London: William Heinemann Medical Books Ltd.Google Scholar