Hostname: page-component-77c89778f8-sh8wx Total loading time: 0 Render date: 2024-07-17T02:00:07.040Z Has data issue: false hasContentIssue false
  • English
  • Français

Chemical composition, dry matter and crude protein digestibilities of some tropical browse plants estimated in vitro

Published online by Cambridge University Press:  27 February 2018

C. M. Shayo  and
P. Udén
C. M. Shayo
Affiliation:
Zonal Research and Training Centre, Livestock Production Research Institute, PO Box 202, Mpwapwa, Tanzania
P. Udén
Affiliation:
Swedish University of Agricultural Sciences, Department of Animal Nutrition and Management, PO Box 7024, S - 750 07, Uppsala, Sweden
Get access

Extract

Browse plants are generally regarded as important food resources for ruminants in the tropics due to their high levels of nitrogen. Particularly during the dry season livestock eat browse which may contain considerable amounts of phenolic compounds including tannins at levels of up to half of the dry matter (Reed, 1986). Tannins are known to react with proteins to form rumen undegradable or totally indigestible complexes.

A uniform food fraction is assumed to have the same true digestibility irrespective of source and level in the food. In the test of uniformity developed by Lucas (1964) and applied by Van Soest (1967) the digestible fraction per unit food is regressed upon its concentration in the food. The slope of the line gives its true digestibility, the intercept, the potential metabolic fraction and the variation around the regression line explains the extent of uniformity of the fraction.

Type
Posters
Information
BSAP Occasional Publication , Volume 22: In vitro techniques for measuring nutrient supply to ruminants , 1998 , pp. 297 - 299
Copyright
Copyright © British Society of Animal Science 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Association of Official Analytical Chemists. 1985. Official methods of analysis, 12th edition. Association of Official Analytical Chemists, Washington, DC.Google Scholar
Hagerman, A. E., Robbins, C. T., Weerasuriya, Y., Wilson, T. C. and McArthur, C. 1992. Tannin chemistry in relation to digestion. Journal of Range Management 45: 57–62.CrossRefGoogle Scholar
Lucas, H. L. 1964. Stochastic elements in biological models; their sources and significance. In Stochastic models in medicine and biology (ed. Gurland, J.). Proceedings of a symposium conducted by Mathematics Research Centre, United States Army, at the University of Wisconsin, Madison, 12-14 June 1963, pp. 355–385. The University of Wisconsin Press.Google Scholar
Nastis, A. S. and Malechek, J. C. 1988. Estimating digestibility of oak browse diets for goats by in vitro techniques. Journal ofRange Management 4: 255–258.Google Scholar
Reed, J. D. 1986. Relationship between soluble phenolics and proanthocyanidins and fibre in East African browse species. Journal of Range Management 39: 5–7.CrossRefGoogle Scholar
Reed, J. D. and Soller, H. 1987. Phenolics and nitrogen utilization in sheep fed browse. In Herbivore nutrition research (ed. Rose, M.), pp. 47–48. Australian Society of Animal Science.Google Scholar
Robbins, C. T., Hanley, T. A., Hagerman, A. E., Hjeljord, O., Baker, D. L., Schwartz, C. C. and Mautz, W. W. 1987. Role of tannins in defending plants against ruminants: reduction in protein availability. Ecology 68: 98–107.CrossRefGoogle Scholar
Van Soest, P. J. 1967. Development of a comprehensive system of feed analyses and its application to forages. Journal of Animal Science 26: 119–128.CrossRefGoogle Scholar
Van Soest, P. J., Robertson, J. B. and Lewis, B. A. 1991. Symposium: carbohydrate methodology, metabolism and nutritional implications in dairy cattle. Methods for dietary fibre, and nonstarch polysaccharides in relation to animal nutrition. Journalof Dairy Science 74: 3583–3597.CrossRefGoogle ScholarPubMed
Waterman, P. G. and Mole, S. 1994. Analysis of phenolic plant metabolites. Blackwell Scientific Publications, London.Google Scholar