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Title: Butritive value of four species of browse preferred by Indeginous goats in a redsoil thornvield in Southern Zimbabwe
Authors: Dube, John S.
Keywords: species
Issue Date: May-1993
Publisher: University of Zimbabwe
Abstract: The nutritive value of Acacia Karroo, Acacia nilotica, Securinenga virosa and Ziziphus mucronata was investigated by analysis, the nylon bag technique and by a feeding trial. The browse species contained high N (19, 25, 34 and 26 g/kg DM, respectively) and low fibre (337, 314, 305 and 336 g NDF/ kg DM respectively). Acacia karroo contained the highest condensed tannin (243g/kg DM): A. nicolita had 67 g/kg DM, Z. microdata, 46g/kg DM and S.virosa, 15 g/kg DM. The four browse species were allocate to four rumen fistulated goats in a four x four Latin Square design. Ten nylon bags containing samples of each species were placed in the rumen and withdrawn in pairs after 3. 6. 12, 14 and 48hours in each period. They were washed, dried and weighed. Securinega virosa degraded fastest (degradation constant c when p = a+b (1-e̵̵̵̵ ⁻ᶜᵗ) = 0, 1528) followed by A nilicotica (c = 0.0922), Z. mucronata (c = 0.1528) and A. Karroo (c = 0.0266). Hand clipped browse was offered with hay to sixteen matebele goats house in metabolism crates. The goats were randomly allocated to the diets. Intake of the browse (g/kg w⁰′⁷⁵/d) was highest for S. virosa (34) followed by Z. mucronata (32), A. nilotica (27) and A. karroo (26). Browse intake was unrelated to tannin content or hay intake. Digestibility of the browse/hay mix was significantly (P<0, 05) negatively related to vanillin _HC1 tannins or the butanol –HC1 tannis.
Appears in Collections:Department of Animal and Rangeland Management

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