Supplementing Guinea grass with fresh sweet potato foliage for milk production by Bunaji and N'Dama cows in early lactation |
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| Authors: | I Etela A Larbi UJ Ikhatua MA Bamikole |
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| Institution: | 1. Department of Animal Science and Fisheries, University of Port Harcourt, Choba, PMB 5323, Port Harcourt, Nigeria;2. International Center for Agricultural Research in the Dry Areas, P.O. Box 5466, Tel Hadya, Aleppo, Syria;3. Department of Animal Science, University of Benin, PMB 1154, Benin City, Nigeria;1. Section of Phytomedicine, Institute of Horticultural Production Systems, Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany;2. Plant Sciences Group, Wageningen University and Research Centre, P. O. Box 16, 6700AA Wageningen, The Netherlands;1. Department of Animal Science, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, São Paulo 14884-900, Brazil;2. INCT/CA–UFV-Department of Animal Science, Av. Peter Henry Rolfs s/n, Campus Universitário, Viçosa, Minas Gerais CEP 36570-000, Brazil |
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| Abstract: | Forage from three sweet potato cultivars (A = TIS-87/0087; B = TIS-8164; C = TIS-2532.OP.1.13 at 30% daily dry matter intake), dried brewers' grains (DBG) and cottonseed meal (CSM) each at 2.5 kg were supplemented to Guinea grass (GG) to form four diets: Diet A = GG + TIS-87/0087; Diet B = GG + TIS-8164; Diet C = GG + TIS-2532.OP.1.13, and Diet D = GG + DBG + CSM (as control). Treatments were assigned as 4 × 4 Latin squares design over 60 days (10-day adaptation and 5-day sampling) using Bunaji and N'Dama cows in early lactation. The 48-h rumen dry matter (DM) degradation ranged (P < 0.01) from 407 g kg? 1 DM for GG to 791 g kg? 1 DM for sweet potato cultivar TIS-87/0087. Bunaji dry matter intake varied (P < 0.05) between 7.1 kg day? 1 in Diet B and 8.9 kg day? 1 in Diet D, but was similar (P > 0.05) among diets for the N'Dama cows. The metabolisable energy (ME) intakes were higher for Diet D although, it recorded the least efficiency of ME utilization for milk production. Milk yields were significantly (P < 0.01) higher in the Bunaji than the N'Dama cows, which is typical of their true breed differences. Total solids, ash, protein, fat, and sugar contents of the milk were similar among diets for both cow breeds, except Bunaji ash contents that ranged (P < 0.05) from 0.77 g 100 g? 1 for Diet B to 0.83 g 100 g? 1 for Diet D. The results suggest that sweet potato forage could be utilized as whole or partial replacement for DBG and CSM to save cost under smallholder farming systems. |
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