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The digestion of frozen and dried grass by sheep

Published online by Cambridge University Press:  27 March 2009

D. E. Beever ,
D. J. Thomson  and
S. B. Cammell
D. E. Beever
Affiliation:
The Orassland Research Institute, Hurley, Maidenhead, Berkshire, SL6 5LR
D. J. Thomson
Affiliation:
The Orassland Research Institute, Hurley, Maidenhead, Berkshire, SL6 5LR
S. B. Cammell
Affiliation:
The Orassland Research Institute, Hurley, Maidenhead, Berkshire, SL6 5LR
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Summary

S. 24 perennial ryegrass, containing 2·9 g nitrogen/100 g D.M.>, was conserved by freezing (to represent the fresh material) or by drying. Three dehydration treatments were imposed, comprising low temperature (inlet temperature 145 °C) high temperature (inlet temperature 900 °C) or oven drying (100 °C for 18 h) and in addition part of the high temperature dried grass was treated with formalin (1 g/100 g crude protein) prior to feeding.

The digestion of the energy and nitrogen components of all diets was investigated using sheep fitted with re-entrant cannulae at the proximal duodenum and terminal ileum.

Dehydration and formalin of the grass reduced nitrogen solubility and apparent energy and nitrogen (P < 0·001) digestibilities but led to increased quantities of nitrogen entering the small intestine (P < 0·01) compared with the frozen diet. A significant relationship describing nitrogen transformations was established: Y = 165–1·13X (r = –0·98, P < 0·001), where Y is g nitrogen entering the small intestine per 100 g N consumed and X is dietary nitrogen solubility. All dried diets showed increased losses of nitrogen within the small intestine compared with the frozen diet, the largest values being observed on the oven-dried and formalin-treated diets.

Neither total VFA production within the rumen nor overall cellulose digestibility was influenced by dehydration, but on the formalin-treated diet there was a marked shift of cellulose digestion from the rumen to the caecum and colon compared with the other diets, associated presumably with the large reduction in protein solubility on this diet.

Dehydration improved the efficiency of conversion of ruminally digested energy to VFA energy within the rumen, and in relation to the nature of the total absorbed nutrients a significant relationship was established:

Y = 30·97–0·22X (r = –0·98; P < 0·001),

where Y is g digestible crude protein lost in the total intestines per 100 g digestible organic matter intake and X is dietary nitrogen solubility.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 86 , Issue 3 , June 1976 , pp. 443 - 452
Copyright
Copyright © Cambridge University Press 1976

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References

Beever, D. E., Cammell, S. B., MissWallace, A. S. (1974). Digestion of fresh, frozen and dried perennial ryegrass in sheep. Proceedings of the Nutrition Society 33, 73A.Google Scholar
Beever, D. E., Thomson, D. J. & Harrison, D. G. (1971). The effects of drying and comminution of red clover on its subsequent digestion by sheep. Proceedings of the Nutrition Society 30, 86A.Google Scholar
Beever, D. E., Thomson, D. J. & Harrison, D. G. (1974). Energy and protein transformations in the rumen, and the absorption of nutrients by sheep fed forage diets. 12th International Grassland Congress, Moscow. (In the Press.)Google Scholar
Beever, D. E., Thomson, D. J., Pfeffer, E. & Armstrong, D. G. (1969). Effects of drying grass on sites of its digestion in sheep. Proceedings of the Nutrition Society 28, 26A–7.Google ScholarPubMed
Beever, D. E., Thomson, D. J., Pfeffer, E. & Armstrong, D. G. (1971). The effect of drying and ensiling grass on its digestion in sheep. Sites of energy and carbohydrate digestion. British Journal of Nutrition 26, 123–34.CrossRefGoogle ScholarPubMed
Brown, G. F., Armstrong, D. G. & MacRae, J. C. (1968). The establishment in one operation of a cannula into the rumen and re-entrant cannulae into the duodenum and ileum of sheep. British Veterinary Journal 124, 78–82.CrossRefGoogle Scholar
Christian, K. R. & Coup, M. R. (1954). Measurement of feed intake by grazing cattle and sheep. VI. The determination of chromic oxide in faeces. New Zealand Journal of Science and Technology A36, 328–430.Google Scholar
Corbett, J. L., Greenhalgh, J. F. D., McDonald, I. & Florence, E. (1960). Excretion of chromium sesquioxide administered as a component of paper to sheep. British Journal of Nutrition 14, 289–99.CrossRefGoogle Scholar
Ekern, A., Blaxter, K. L. & Sawers, D. (1965). The effect of artificial drying and of freezing on the energy value of pasture herbage. Proceedings of the 3rd Symposium, Troon (1964). In Energy Metabolism (ed. Blaxter, K. L.), pp. 217–24. European Association for Animal Production, publication no. 11. London, New York: Academic Press.Google Scholar
Graham, N. McC. (1964). Utilization by fattening sheep of the energy and nitrogen in fresh herbage and in hay made from it. Australian Journal of Agricultural Research 15, 974–81.Google Scholar
Hogan, J. P. (1973). Intestinal digestion of subterranean clover by sheep. Australian Journal of Agricultural Research 24, 587–98.CrossRefGoogle Scholar
Hogan, J. P. & Weston, R. H. (1970). Quantitative aspects of synthesis in the rumen. In Physiology of Digestion and Metabolism in the Ruminant (ed. Phillipson, A. T.), pp. 474–85. Newcastleupon-Tyne: Oriel Press.Google Scholar
MacRae, J. C. & Armstrong, D. G. (1969). Studies on intestinal digestion in the sheep. I. The use of chromic oxide as an indigestible marker. British Journal of Nutrition 23, 15–23.CrossRefGoogle ScholarPubMed
MacRae, J. C. & Ulyatt, M. J. (1974). Quantitative digestion of fresh herbage by sheep. II. The sites of digestion of some nitrogenous constituents. Journal of Agricultural Science, Cambridge 82, 309–19.Google Scholar
Osbourn, D. F. (1970). The voluntary intake of forage crops by sheep. Ph.D. Thesis, Reading.Google Scholar
Proud, C. J. (1973). Nitrogen digestion in adult ruminants. Ph.D. Thesis, Newcastle-upon-Tyne.Google Scholar
Reid, R. L. & Jung, G. A. (1965). Factors affecting the intake and palatability of forages by sheep. 9th International Grassland Congress (Brazil), pp. 863–9.Google Scholar
Schoch, H., Schurch, A. & Crasemann, E. (1965). Experiments on the energetic efficiency of frozen and dehydrated grass for the ruminant. Proceedings of the 3rd Symposium, Troon (1964). In Energy Metabolism (ed. Blaxter, K. L.), pp. 225–30. European Association for Animal Production, publication no. 11. London, New York: Academic Press.Google Scholar
Thomas, P. C. & Clapperton, J. L. (1972). Significance to the host of changes in fermentation activity. Proceedings of the Nutrition Society 31, 165–70.CrossRefGoogle Scholar
Thomson, D. J., Beever, D. E., Coelho da Suva, J. F. & Armstrong, D. G. (1972). The effect in sheep of physical form on the sites of digestion of a dried lucerne diet. I. Sites of organic matter, energy and carbohydrate digestion. British Journal of Nutrition 28, 31–41.Google Scholar
Tilley, J. M. A. & Terry, R. A. (1963). A two-stage technique for the in vitro digestion of forage crops. Journal of the British Grassland Society 18, 104–11.Google Scholar
Weller, R. A., Gray, F. V., Pilgrim, A. F. & Jones, G. B. (1967). The rates of production of volatile fatty acids in the rumen. V. Individual and total volatile fatty acids. Australian Journal of Agricultural Research 18, 107–18.Google Scholar
Weston, R. H. (1971). Factors limiting the intake of feed by sheep. V. Feed intake and the productive performance of the ruminant lamb in relation to the quantity of crude protein digested in the intestines. Australian Journal of Agricultural Research 22, 307–20.Google Scholar
Weston, R. H. & Hogan, J. P. (1974). Relationships between intestinal protein digestion and various dietary and metabolic parameters in the forage fed sheep. 12th International Grassland Congress, Moscow. (In the Press.)Google Scholar