DEPARTMENT OF ANIMAL SCIENCE

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End date: 2009Subject: search.filters.subject.Sweet potato

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    Utilization of sweet potato as a forage supplement to a maize stover diet by West African dwarf sheep
    (Animal Science Association of Nigeria, 2005) Olorunnisomo, O. A.; Ososanya, T. O.; Adewumi, M. K.
    In a growth and digestibility trial with West African dwarf sheep (WAD) the effects of supplementing maize stover with four levels of sweet potato forage (0, 1, 2 and 3% of body weight) on intake and growth rate of the animals; and digestibility of maize stover, sweet potato forage and their mixture were determined using a randomized complete block and completely randomized design, respectively. The dry matter (DM) intake and growth rate of the animals improved significantly (P < 0.01) with increasing level of sweet potato forage in the diet. DM intake was highest at the highest level (3% BW) of sweet potato inclusion and was 140% of the sole maize stover diet. Growth rate of animals at 3% (BW) level of sweet potato supplementation was 195% better than that of animals on sole maize stover. Digestibility of sheep diet improved significantly (P < 0.05) when sweet potato forage formed whole or part of the diet. Addition of sweet potato forage to a basal diet of maize stover improved animal productivity from this fibrous crop residue.
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    Sweet potato production, utilisation and marketing in Nigeria
    (The International Potato Center (CIP), Apartado 1558, Lima 12, Peru, and the University of Ibadan, Oyo State, Nigeria, 2003-06) Tewe, O. O.; Ojeniyi, F. E.; Abu, O. A.
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    Protein enrichment of sweet potato by solid state fermentation using four mono-culture fungi
    (Biotechnology Society of Nigeria, 1999) Abu, O. A.; Oguntimein, G. B.; Tewe, O. O.
    Washed, sliced and oven-dried whole sweet potato tubers (Ipomoea batatas) of the local variety were milled and supplemented with a mineral salts solution containing (g litre-1) glucose, 5; (NH4)2 SO4 1.5; KH2 PO4, 1.5; MgSO4 0.05;Yeast extract, 0.05 and fermented at 30ₒC for 72 hr by solid state fermentation (SSF) using Neurospora sitophila, Aspergillus niger, Candida utilis and Saccharomyces uvarum. At the end of the fermentation period A. niger gave the highest protein content of 11.8%, DM basis while S. uvarum showed the least protein content. However in terms of true protein production N sitophila gave the best value of 8.98%. While S. uvarum gave the least value under the Standard condition.
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    The role of sweet potato in livestock farming in Nigeria
    (Sweet Potato Group (SPG), 2008-09) Abu, O. A.; Tewe, O. O.
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    Solid-state fermentation of sweet potato using two monoculture fungi: changes in protein, fatty acid and mineral composition
    (1997-09) Abu, O. A.; Losel, D. M.; Tewe, O. O.
    This study evaluated the protein fatty acid and mineral changes in sweet potato root heal inoculated with two selected fungi by solid state fermentation procedure. The total protein content was raised from 4.95% to 11.83% and 6.69% within 48 hrs for Aspergillus oryzae and Aspergillus niger respectively. The total lipid dropped from 1.93% in the control to 1.36 and 4.19% for A. niger and A. oryzae respectively. The fatty acids C16:0 andC18:2 were preponderant over other fatty acids with A. niger and A. oryzae recording 18.94 and 28.17% for 06:0 and 43.20 and 37.88% for C18:2 respectively. The ash content values were 3.53% for the control, 3.54 and 4.51% for A. niger and A. oryzae respectively. The mineral changes analysed were for Calcium. Potassium, Iran. Manganese, Sodium, Zinc and Phosphorus. The pH changed from 5.26 for the control to 3.80 and 5.39 for A: niger and A oryzae respectively