DEPARTMENT OF ANIMAL SCIENCE

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Author: search.filters.author.Tewe, O. O.End date: 1999

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    Performance, nutrient digestibility and carcass characteristics of rabbit fed sweet potato based diets
    (1999) Abu, O. A.; Tewe, O. O.; Bakare, J.
    The performance, nutrient digestibility and carcass characteristics of rabbits fed dehydrated sweet potato tops and sweet potato root meal in proportions of 100: 0. 90 : 10, 80: 20. 70 : 30, 60 : 40 and 50: 50 were investigated. There was no significant difference (P>0.05) in daily feed intake. However, rabbits fed diets in proportion of 80 : 20 (T.) recorded the highest daily weight gain and was significantly different (P<0.05) from other dietary treatments. No significant difference (P>0.05) was reported for the apparent digestibility of crude fibre and ash. Rabbits on diets T3 (80 : 20) and T4 (70 : 30) had the highest killing out per cent and head weights. No mortality was recorded throughout the duration of this study.
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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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    Suitability of screened fungi for solid state fermentation
    (1999) Abu, O. A.; Losel, D. M.; Onifade, A. A.; Tewe, O. O.
    Seven fungi were screened to determine their suitability for solid-state fermentation. In a 5-day submerged fermentation Aspergillus niger, Aspergillus oryzae, Fusarium oxysporum, Rhizopus isolate, Amtillaria mellea and Rhizopus sexualis recorded 166.49, 122.60, 50.58, 23.94. 17.94 and 39.80 mg/ 100 ml biomass production respectively. Pleurotus ostreatus did not show any growth. However the colony radial growth rates of A. niger, A. oryzae, F. oxysporum and P. ostreatus varied from 10.50-76.88 mm over a 7-day growth period. The best colony radial growth rate of 76.88 mm was obtained for A. niger while 49.83, 73.83 and 50.50 mm were obtained for A. oryzae, P. ostreatus and F. oxysporum respectively. A positive correlation was obtained between colony radial growth rates and rate of starch utilization by the fungi. The overall result indicated that A. niger and A. oryzae had superiority over other fungi for all the parameters studied. They are therefore recommended for future studies of protein enrichment of starchy Substrates by solid state fermentation.
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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