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The relative resistance to escape of leaf and stem particles from the rumen of cattle and sheep

  • D. P. Poppi (a1), R. E. Hendricksen (a1) and D. J. Minson (a1)


In a study of the effect of animal species on the threshold particle size leaving the rumen, two grasses cut at two stages of growth and one mature legume were separated into leaf and stem fractions and fed to cattle and sheep. Samples of rumen digesta and faeces were used to determine the validity of using a 1·18 mm porosity screen to separate the rumen particles into large and small pools when studying escape of particles from the rumen. Samples of rumen digesta and faeces were collected for the determination of particle size by wet sieving and the calculation of resistance of particles to passage from the rumen relative to small particles retained on a 0·15 mm sieve.

Particles < 1·18 mm but > 0·5 mm had a mean relative resistance to passage of 2·0 and 2·6 for cattle and sheep respectively, compared with resistance values of between 10·9 and 31·2 for particles between 1·18 and 2·36 mm. It is suggested that there is no justification for using different threshold particle sizes for sheep and cattle and that a 1·18 mm sieve may be used to divide the rumen contents of both cattle and sheep into two pools of particles with high and low relative resistance to passage from the rumen.



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American Society of Agricultural Engineers (1967). Method of determining modulus of uniformity and modulus of fineness of ground feed. Agricultural Engineers Yearbook, p. 301.
Baldwin, R. I., Koong, L. J., Ulyatt, M. J. & Smith, N. (1976). Toward a synthesis. In From Plant to Animal Protein, Reviews in Rural Science Vol. II (ed. Sutherland, T. M., McWilliam, J. R. and Leng, R. A.), pp. 175181. Armidale, Australia: University of New England Publishing Unit.
Florentin, P. (1952). A study on the situation and the passages of interior communication of the gastric reservoirs in the domestic ruminants. Revue de Médecine Vétérinaire 103, 530542.
Greenhalgh, J. F. D. & Reid, G. W. (1973). The effects of pelleting various diets on intake and digestibility in sheep and cattle. Animal Production 16, 223233.
Grenet, E. (1966). Plant particles in the faeces of sheep. Annales de Zootechnie 15, 303312.
Grenet, E. (1970). Size and structure of plant particles in the omasum and faeces of cattle. Annales de Biologie Animale, Biochimie et Biophysique 10, 643657.
Hendricksen, R. E., Poppi, D. P. & Minson, D. J. (1981). The voluntary intake, digestibility and retention time by cattle and sheep of stem and leaf fractions of a tropical legume (Lablab purpureus). Australian Journal of Agricultural Research 32, 389398.
Lee, J. A. & Pearce, G. R. (1984). The effectiveness of chewing during eating on particle size reduction of roughage by cattle. Australian Journal of Agricultural Research 35, 609618.
Mebtens, D. R. & Ely, L. O. (1979). A dynamic model of fiber digestion and passage in the ruminant for evaluating forage quality. Journal of Animal Science 49, 10851095.
Poppi, D. P., Minson, D. J. & Ternouth, J. H. (1981 a). Studies of cattle and sheep eating leaf and stem fractions of grasses. III. The retention time in the rumen of large feed particles. Australian Journal of Agricultural Research 32, 123137.
Poppi, D. P., Minson, D. J. & Ternouth, J. H. (1981 b). Studies of cattle and sheep eating leaf and stem fractions of grasses. I. The voluntary intake, digestibility and retention time in the reticulo-rumen. Australian Journal of Agricultural Research 32, 99108.
Poppi, D. P., Norton, B. W., Minson, D. J. & Hendricksen, R. E. (1980). The validity of the critical size theory for particles leaving the rumen. Journal of Agricultural Science, Cambridge 94, 275280.
Reid, C. S. W., Ulyatt, M. J. & Monro, J. A. (1977). The physical breakdown of feed during digestion in the rumen. Proceedings of the New Zealand Society of Animal Production 37, 173175.
Thomas, S. & Campling, R. C. (1977). Comparisons of some factors affecting digestibility in sheep and cows. Journal of the British Grassland Society 32, 3341.
Uden, P. & Van Soest, P. J. (1982). The determination of digesta particle size in some herbivores. Animal Feed Science and Technology 7, 3544.
Ulyatt, M. J. (1983). Plant fibre and regulation of digestion in the ruminant. In Fibre in Human and Animal Nutrition. Bulletin 20 (ed. Wallace, G. and Bell, L.), pp. 103107. Wellington, New Zealand: The Royal Society of New Zealand.
Van Soest, P. J. (1966). Forage intake in relation to chemical composition and digestibility: some new concepts. Proceedings of the 23rd Southern Pasture Forage Crop Improvement Conference, pp. 2436.


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