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Trop Anim Health Prod

Title:		Mitigating the anti-nutritional effect of polyphenols on in vitro digestibility and fermentation characteristics of browse species in north western Ethiopia
Author(s):		Mekuriaw S; Tsunekawa A; Ichinohe T; Tegegne F; Haregeweyn N; Nobuyuki K; Tassew A; Mekuriaw Y; Walie M; Tsubo M; Okuro T;
Address:		"United Graduate School of Agricultural Sciences (UGSAS), Tottori University, 1390 Hamasaka, Tottori, 680-8553, Japan. shigdaf@gmail.com. Amhara Regional Agricultural Research Institute, Andassa Livestock Research Center, P.O. Box, 27, Bahir Dar, Ethiopia. shigdaf@gmail.com. Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori, Tottori Prefecture 680-0001, Japan. tsunekawa@alrc.tottori-u.ac.jp. Faculty of Life and Environmental Science, Shimane University, Matsue-shi, Shimane, 690-8504, Japan. School of Animal Science and Veterinary Medicine, Bahir Dar University, P.O. Box 5501, Bahir Dar, Ethiopia. International Platform for Dryland Research and Education, Tottori University, Tottori, Japan. Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori, Tottori Prefecture 680-0001, Japan. Amhara Regional Agricultural Research Institute, Andassa Livestock Research Center, P.O. Box, 27, Bahir Dar, Ethiopia. Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan"
Journal Title:		Trop Anim Health Prod
Year:		2020
Volume:		20191114
Issue:		3
Page Number:		1287 - 1298
DOI:		10.1007/s11250-019-02126-3
ISSN/ISBN:		1573-7438 (Electronic) 0049-4747 (Linking)
Abstract:		"Browse species are important sources of forage for livestock in Ethiopia, especially during the dry season, when the quality and quantity of green herbage is limited. However, browse species have anti-nutritional factors, such as polyphenols. This study evaluated the extent to which polyethylene glycol (PEG) can reduce the anti-nutritional effects of polyphenols whose extent is expected to vary depending on the species type and season on the in vitro fermentation of these plant samples. We selected ten browse species commonly used as livestock feed based on their tannin content, and sixty samples of the leaf and twig of these species were collected during the wet and dry seasons. The study was designed as 10 x 2 x 2 factorial arrangement with 10 browse species (Acacia nilotica, Crateva adonsonia, Dombeya torrida, Ekebergia capensis, Ensete ventricosum, Erythrina brucei, Maesa lanceolate, Sesbania sesban, Stereospermum kunthianum, and Terminalia laxiflora), 2 seasons (wet and dry) and 2 states of PEG (with and without PEG). The effects of tannin on the nutritive characteristics were also evaluated by adding PEG as a tannin-binding agent. The chemical composition and in vitro fermentation products of these samples differed significantly (p < 0.001) among browse species. Specifically, total extractable phenol (TEP) ranged from 26.3 to 250.3 g/kg, total extractable tannin (TET) from 22.8 to 210.9 g/kg, and condensed tannin (CT) from 11.1 to 141.3 g/kg, respectively. Season, species, and their interaction have a significant (p < 0.05) effect on the chemical composition and fermentation characteristics of most browse species. The addition of PEG increased gas production (GP), in vitro organic matter digestibility (IVOMD), metabolizable energy (ME) concentration, dry matter degradability (DMD), and volatile fatty acids (VFA), on average, by 76.8%, 47.9%, 42.2%, 21.2%, and 20.2%, respectively. Secondary polyphenols (TEP, TET, CT, and SCT) were significantly (p < 0.001) and negatively correlated with GP, IVOMD, ME, and VFA. Preferable species namely E. ventricosum, S. sesban, M. lanceolata, E. capensis, and A. nilotica were selected for supplementation in terms of their chemical composition, IVOMD, and mitigating effects of PEG on anti-nutritional functions of their secondary compounds. In conclusion, PEG markedly reduced the anti-nutritional effects of polyphenols and improved the in vitro fermentation of browse species harvested in contrasting seasons"
Keywords:		"Animals *Digestion Ethiopia *Fermentation In Vitro Techniques *Magnoliopsida *Nutritive Value Polyphenols/*physiology Sheep/*physiology Dryland In vitro digestibility Polyethylene glycol Season Tannin, Browse species;"
Notes:		"MedlineMekuriaw, Shigdaf Tsunekawa, Atsushi Ichinohe, Toshiyoshi Tegegne, Firew Haregeweyn, Nigussie Nobuyuki, Kobayashi Tassew, Asaminew Mekuriaw, Yeshambel Walie, Misganaw Tsubo, Mitsuru Okuro, Toshiya eng 2019/11/16 Trop Anim Health Prod. 2020 May; 52(3):1287-1298. doi: 10.1007/s11250-019-02126-3. Epub 2019 Nov 14"