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Validation of new systems for protein evaluation in ruminants by testing the effect of urea supplementation on intake and digestibility of straw with or without sodium hydroxide treatment

Published online by Cambridge University Press:  27 March 2009

E. R. Ørskov  and
D. A. Grubb
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
D. A. Grubb
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
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Summary

Milled barley straw, either untreated or treated with 70 g of NaOH/kg straw was supplemented with four levels of urea, namely 0, 6, 12 or 18 g/kg and fed ad libitum to young sheep. For the untreated straw, dry-matter intakes were (g/day) 423, 451, 441 and 463, while the digestibility of organic matter was 458, 467, 490 and 483 g/kg, respectively. For the treated straw, the intakes of dry matter were 355, 402, 531 and 567 g/day and the digestibility of organic matter was 423, 480, 589 and 628 g/kg respectively.

The different responses to urea supplementation of treated and untreated straw are discussed in relation to a new system of estimating protein requirements for ruminants put forward by the Agricultural Research Council.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 91 , Issue 2 , October 1978 , pp. 483 - 486
Copyright
Copyright © Cambridge University Press 1978

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References

REFERENCES

Burroughs, W., Nilson, D. K. & Mertens, D. R. (1975). Evaluation of protein nutrition by metabolizable protein and urea fermentation potential. Journal of Dairy Science 58, 611–619.CrossRefGoogle ScholarPubMed
Donefer, E., Adeleye, I. O. A. & Jones, T. A. O. C. (1969). Effect of urea supplementation on the nutritive value of NaOH treated straw. In Celluloses and their Application (ed. Gould, R. F.). Washington, D.C., U.S.A.: American Chemical Society.Google Scholar
Egan, A. R. & Moir, K. J. (1965). Nutritional studies and intake regulation in sheep. Australian Journal of Agricultural Research 16, 437–449.CrossRefGoogle Scholar
Fernandez-Carmone, J. & Greenhalgh, J. F. D. (1972). The digestibility and acceptability to sheep of chopped or milled barley straw soaked or sprayed with alkali. Journal of Agricultural Science, Cambridge 78, 477–485.Google Scholar
Greenhalgh, J. F. D. (1976). Improving the nutritive value of straw by alkali treatment. Agricultural Research Council Research Review 2, 67–70.Google Scholar
Miller, E. L. (1973). Evaluation of food as sources of nitrogen and amino-acids. Proceedings of the Nutrition Society 32, 79–84.Google Scholar
Miller, E. L., Balch, C. C., Ørskov, E. R., Roy, J. H. B. & Smith, R. H. (1977). Comparison of calculated N requirements for ruminants with the results of practical feeding trials. Proceedings of the 2nd International Symposium on Protein Metabolism and Nutrition. Pudoc Wageningen, pp. 137–141.Google Scholar
Ørskov, E. R., Fraser, C., Mason, V. C. & Mann, S. O. (1970). Influence of starch digestion in the large intestine of sheep on caecal fermentation, caecal microflora and faecal nitrogen excreta. British Journal of Nutrition 24, 671–682.Google Scholar
Ørskov, E.R., Fraser, C. & McDonald, I. (1972). Digestion of concentrate in sheep. 4. The effect of urea on digestion, nitrogen retention and growth in young lambs. British Journal of Nutrition, 27, 491–501.Google Scholar
Roy, J. H. B., Balch, C. C.Miller, E. L., Ørskov, E. R. & Smith, R. H. (1977). Calculation of N requirements for ruminants from nitrogen metabolism studies. Proceedings of the 2nd International Symposium on Protein Metabolism and Nutrition. Pudoc Wageningen, pp. 126–128.Google Scholar
Voight, J. & Piatkowski, B. (1974). Studies on the chemical degradation of cereal straw. (5) The effect of sodium in NaOH treated straw on the composition of blood and urine and on the excretion of various compounds. Archives fur Tierernarung 24, 589–599.Google Scholar