Proanthocyanadin (condensed tannin) content of Brachystegia spiciformis browse harvested at different stages of growth from three sites in Zimbabwe

  • JJ Baloyi Department of Animal Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe; current address: Department of Animal Science, North-west University, Mafikeng Campus, Private Bag X2046, Mmbatho 2735, South Africa
  • T Acamovic Department of Biochemistry and Nutrition, Scottish Agricultural College, Auchincruive, Ayr, KA6 5HW, Scotland, UK
  • NT Ngongoni Department of Animal Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe; current address: Department of Animal Science, North-west University, Mafikeng Campus, Private Bag X2046, Mmbatho 2735, South Africa
  • H Hamudikuwanda Department of Animal Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe; current address: Department of Animal Science, North-west University, Mafikeng Campus, Private Bag X2046, Mmbatho 2735, South Africa
Keywords: browse legume, proanthocyanidins n-butanol, stages

Abstract

The extractable and insoluble (bound to protein or neutral detergent fibre [NDF] proanthocyanadin (PA) of the tree species Brachystegia spiciformis (Musasa) harvested at different stages of growth from three sites with different soil types in Zimbabwe was analysed by the n-butanol-HCl method. Brachystegia spiciformis samples from one site showed significantly lower (P < 0.05) PA values than those from the other two sites. Higher (P < 0.01) proportions of insoluble PA (insoluble PA/total PA) were observed in leaves than in twigs. Substantial levels of PA were detected as bound tannins, ranging from 470–804g kg–1. These results suggest that measurement of bound condensed tannin is necessary when identifying forages containing condensed tannins. The higher contents of PA in the leaves that were harvested when mature than in young leaves could explain why animals prefer eating young rather than mature leaves of B. spiciformis.

Keywords: browse legume, proanthocyanidins n-butanol, stages

African Journal of Range & Forage Science 2006, 23(3): 197–200
Published
2006-11-20
Section
Articles

Journal Identifiers


eISSN: 1727-9380
print ISSN: 1022-0119