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The effect of grinding and pelleting on the nutritive value of poor quality roughages for sheep

Published online by Cambridge University Press:  27 March 2009

F. W. Wainman  and
K. L. Blaxter
F. W. Wainman
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
K. L. Blaxter
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Summary

Analysis of published data relating to the chemical composition of feeds – mostly roughages – before and after grinding and pelleting showed that ash and crude-protein content increased and crude fibre declined. On the assumption that the ash content was unaffected by grinding and pelleting, the crude-protein and crude-lipid content of the original material was shown to be unaffected by the process but the total carbohydrate was depressed. The loss of organic matter on pelleting was 9% and reasons are given for believing that this was due to partial pyrolysis of the carbohydrate.

Calorimetric experiments with a poor quality sainfoin hay and a poor aftermath mixed hay showed that grinding and pelleting increased intake by over 80%, and also increased the metabolizability of the gross energy. The increases were from 37·4 to 40·7% for sainfoin and from 38·2 to 44·4% for the hay. The energy of the pellets was used more efficiently for maintenance in both instances, and with the hay, the efficiency of utilization of its metabolizable energy for production increased from 24·2 to 54·1%. With sainfoin no similar comparison was possible since the sheep given the chopped sainfoin could not achieve positive energy retention. The sainfoin pellets were used for production with an efficiency of 56%. Energy retention in sheep given as much sainfoin as they would consume without refusal increased from – 336 to + 3207 kj/d on pelleting the diet. With hay or hay pellets which were given ad libitumthe corresponding values were + 297 to + 4742 kj/d respectively.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 79 , Issue 3 , December 1972 , pp. 435 - 445
Copyright
Copyright © Cambridge University Press 1972

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References

REFERENCES

Association Of Official Agricultural Chemists (1965). Official Methods of Analysis. 10th Ed. p. 327. Washington, D.C.: A.O.A.C.Google Scholar
Balch, C. C. & Campling, R. C. (1962). Regulation of voluntary food intake in ruminants. Nutr. Abstr. Rev. 32, 669–86.Google ScholarPubMed
Baumgardt, R. R. (1970). Control of feed intake in the regulation of energy balance. In Physiology of Digestion and Metabolism in the Ruminant, pp. 235–53. Ed. by Phillipson, A. T.Newcastle on Tyne: Oriel Press.Google Scholar
Bensadoun, A., Paladines, O. L. & Reid, J. T. (1962). Effect of level of intake and physical form of the diet on plasma glucose concentration and volatile fatty acid absorption in ruminants. J. Dairy Sci. 45, 1203–10.CrossRefGoogle Scholar
Blaxter, K. L. & Boyne, A. W. (1970). A new method of expressing the nutritive value of feeds as sources of energy. In Energy Metabolism of Farm Animals, pp. 9–13. (Schürch, A. & Wenk, C., editors.) Zurich: Juris Druck.Google Scholar
Blaxter, K. L. & Graham, N. McC. (1956). The effect of the grinding and cubing process on the utilization of the energy of dried grass. J. agric. Sci., Camb. 47, 207–17.CrossRefGoogle Scholar
Blaxter, K. L., Wainman, F. W., Dewey, P. J. S., Davidson, J., Denerley, H. & Gunn, J. B. (1971). The effects of nitrogenous fertilizer on the nutritive value of artificially dried grass. J. agric. Sci. Camb. 76, 307–19.CrossRefGoogle Scholar
Brouwer, E. (1965). Report of Sub-oommittee on Constants and Factors. In Energy Metabolism, pp. 441–43. Ed. by Blaxter, K. L.London: Academic Press.Google Scholar
Byrne, G. A., Gardiner, D. & Holmes, F. H. (1966). The pyrolysis of cellulose and the action of flame retardants. J. appl. Chem. 16, 81–8.CrossRefGoogle Scholar
Chenost, M. (1966). L'indice de fibrosité des foins: mesure et relations avec la valeur alimentaire. Annls Zootech. 15, 253–7.CrossRefGoogle Scholar
Demarquilly, C. & Journet, M. (1967). Valeur alimentaire des foins condensés, i. Influence de la nature du foin et de la finesse de broyage sur la digestibilité et la quantité ingérée. Annls Zootech. 16, 123–50.CrossRefGoogle Scholar
Greenhalgh, J. F. D. & Wainman, F. W. (1972). The nutritive value of processed roughages for fattening cattle and sheep. Proc. Br. Soc. Anim. Prod. 61–72.CrossRefGoogle Scholar
Marchant, W. T. B. (1972). Private communication based on investigations at the National Institute of Agricultural Engineering.Google Scholar
Minson, D. J. (1963). The effect of pelleting and wafering on the feeding value of roughages – a review. J. Br. Grassld Soc. 18, 39–44.CrossRefGoogle Scholar
O'Dell, G., King, W. A. & Cook, W. C. (1968). Effect of grinding, pelleting and frequency of feeding of forage on fat percentage of milk and milk production of dairy cows. J. Dairy Sci. 51, 50–5.CrossRefGoogle ScholarPubMed
Shajfizadeh, F. (1968). Pyrolysis and combustion of cellulosic materials. Adv. Carbohyd. Chem. 23, 419–74.Google Scholar
Wainman, F. W. & Blaxter, K. L. (1969). Further experience with closed circuit respiration chambers. In Energy Metabolism of Farm Animals, pp. 429–33. Ed. by Blaxter, K. L., Kielanowski, J. & Thorbek, G.Newcastle on Tyne: Oriel Press Ltd.Google Scholar
Wainman, F. W., Blaxter, K. L. & Smith, J. S. (1972). The utilization of the energy of artificially dried grass prepared in different ways. J. agric. Sci., Camb. 78, 441–7.CrossRefGoogle Scholar
Weir, W. C, Meyer, J. H., Garrett, W. N., Lofgreen, G. P. & Ittner, N. R. (1959). Pelleted rations compared to similar rations fed chopped or ground for steers and lambs. J. Anim. Sci. 18, 805–14.CrossRefGoogle Scholar
Wright, P. L., Pope, A. L. & Phillips, P. H. (1963). Effect of physical form of ration upon digestion and volatile fatty acid production in vivo and in vitro. J. Anim. Sci. 22, 586–91.CrossRefGoogle Scholar