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Sorghum tannins: a review

Published online by Cambridge University Press:  18 September 2007

C.M. Nyachoti
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
J.L. Atkinson
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
S. Leeson*
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
*
1Corresponding author.
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Abstract

The feeding value of sorghum for poultry has been a subject of study for many years. Of particular interest has been tannin, an antinutritive factor present in some sorghum cultivars, its influence on bird performance and means of alleviating its effects. This paper briefly discusses antinutritive factors in feedstuffs and reviews in detail the literature on the deleterious effects of sorghum tannins on various performance parameters and on the detoxif ication methods that have been tested. Inconsistencies in the literature are highlighted.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1997

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References

Ahmed, A.E., Smithard, R. and Ellis, M. (1991) Activities of enzymes of the pancreas, and the lumen and mucosa of the small intestine in growing broiler cockerels fed on tannin–containing diets. British Journal of Nutrition 65: 189197CrossRefGoogle ScholarPubMed
Armanious, M.W., Britton, W.M., and Fuller, H.L.. (1973) Effect of methionine and choline on tannic acid and tannin toxicity in the laying hen. Poultry Science 52: 21602168CrossRefGoogle ScholarPubMed
Armstrong, W.D., Featherston, W.R., and Rogler, J.C.. (1973) Influence of methionine and other dietary additions on the performance of chicks fed bird resistant sorghum grain diets. Poultry Science 52: 15921599CrossRefGoogle Scholar
Armstrong, W.D., Rogler, J.C., and Featherston, W.R.. (1974a) Effect of tannin extraction on the performance of chicks fed bird resistant sorghum grain diets. Poultry Science 53: 714720CrossRefGoogle Scholar
Armstrong, W.D., Featherston, W.R., and Rogler, J.C.. (1974b) Effects of bird resistant sorghum grain and various commercial tannins on chick performance. Poultry Science 53: 21372142CrossRefGoogle Scholar
Aurora, S.K. and Luthra, Y.P. (1974) The in vitro digestibility of promising Indian varieties of sorghum and its relation with tannin content. Indian Journal of Nutrition and Dietetics 11: 233236Google Scholar
Bagepalli, S., Rao, N. and Prabhavathi, T. (1982) Tannin content of foods commonly consumed in India and its influence on ionizable iron. Journal of the Science of Food and Agriculture 33: 8996Google Scholar
Banda-Nyirenda, D.B.G., and Vohra, P. (1990) Nutritional improvement of tannin-containing sorghums (Sorghum bicolor) by sodium bicarbonate. Cereal Chemistry 67: 533537Google Scholar
Banda-Nyirenda, D.B.G., Vohra, P. and Ingrebretson, K.H. (1987) Nutritional evaluation of some varieties of sorghums (Sorghum bicolor (L.) Moench). Cereal Chemistry 64: 413417Google Scholar
Berenbaum, M. (1980) Adaptive significance of midgut pH in larval Lepidoptera. American Nuturalist 115: 138146CrossRefGoogle Scholar
Bonino, M.F., Azcona, J.O. and Sceglio, O. (1980) The effect of ammoniation, methionine and gluten meal supplementation on the performance of laying hens fed high tannin sorghum grain diets. Proceedings of the 6th European Poultry Conference, Hamburg 3: 481488Google Scholar
Boren, B. and Waniska, R.D. (1992) Sorghum seed colour as an indicator of tannin content. Journal of Applied Poultry Research 1: 117121CrossRefGoogle Scholar
Breuer, L.H. JR. and Dohm, C.K. (1972) Comparative nutritive value of several sorghum varieties and hybrids. Journal of Agriculture and Food Chemistry 20: 8386CrossRefGoogle ScholarPubMed
Brown, D.R., Southern, L.L. and Baker, D.H. (1985) A comparison of methods for organ–weight data adjustments in chicks. Poultry Science 64: 366369CrossRefGoogle Scholar
Bullard, R.W., Garrisson, M.V., Kilburn, S.R. and York, J.O. (1980) Laboratory comparisons of polyphenols and their repellent characteristics in bird–resistant sorghum grains. journal of Agriculture and Food Chemistry 28: 10061011CrossRefGoogle ScholarPubMed
Butler, L.G. (1989) Sorghum polyphenols. In: Toxicants of Plant Origin, Vol. 4, Phenolics (Ed. Cheeke, P.R.), CRC Press, Boca Raton, Florida, pp. 95114Google Scholar
Chang, M.J., Bailey, J.W., and Collins, J.L.. (1993) Dietary tannins from cowpeas and tea transiently alter apparent calcium absorption but not absorption of protein in rats. Journal of Nutrition 124: 283288CrossRefGoogle Scholar
Chang, S.I. and Fuller, H.L. (1964) Effects of tannin content of grain sorghums on their feeding value for growing chicks. Poultry Science 43: 3036CrossRefGoogle Scholar
Chavan, J.K., Kadam, S.S., Ghonsikar, C.P. and Salunkhe, D.K. (1979) Removal of tannins and improvement of in vitro protein digestibility of sorghum seeds by soaking in alkali. Journal of Food Science 46: 13191321CrossRefGoogle Scholar
Chavan, J.K., Kadam, S.S., and Salunkhe, D.K.. (1981) Changes in tannin, free amino acids, reducing sugars, and starch during seed germination of low and high tannin cultivars of sorghum. Journal of Food Science 46: 638642CrossRefGoogle Scholar
Chibber, B.A.K., Mertz, E.T. and Axtell, J.D. (1978) Effects of dehulling on tannin content, protein distribution, and quality of high and low tannin sorghum. Journal of Agricultural and Food Chemistry 26: 679683CrossRefGoogle Scholar
Chibber, B.A.K., Mertz, E.T. and Axtell, J.D. (1980) In vitro digestibility of high tannin sorghum at different stages of dehulling. Journal of Agricultural and Food Chemistry 28: 160161CrossRefGoogle ScholarPubMed
Cousins, B.W., Tanksley, T.D JR., Knabe, D.A. and Zebrowska, T. (1981) Nutrient digestibility and performance of pigs fed sorghums varying in tannin concentration. Journal of Animal Science 53: 15241537CrossRefGoogle ScholarPubMed
Daiber, K.H. (1975) Enzyme inhibition by polyphenols of sorghum grains and malt. Journal of the Science of Food and Agriculture 26: 13991411CrossRefGoogle Scholar
Damron, B.L., Prine, G.M., and Harms, R.H.. (1968) Evaluation of various bird resistant and non-resistant varieties of grain sorghum for use in broiler diets. Poultry Science 47: 16481650CrossRefGoogle Scholar
Dogget, H. (1970) Sorghum. Longmans Green, LondonGoogle Scholar
Dogget, H. (1977) Quality improvement in sorghum and millets. Proceedings of the Symposium on Sorghum and Millets for Hiimatz food, Vienna 11–22 May 1976 (Ed. Dendy, D.A.V.), Tropical Production Institute, London, pp. 78Google Scholar
Douglas, J.H., Sullivan, T.W., Bond, P.L. Struwe, F.J., Baier, J.G. and Robeson, L.G. (1990 a) Influence of grinding, rolling, and pelleting on the nutritional value of grain sorghums and yellow corn for broilers. Poultry Science 69: 21502156CrossRefGoogle Scholar
Douglas, J.H., Sullivan, T.W., Bond, P.L. and Struwe, F.J. (1990 b) Nutrient composition and metabolizable energy values of selected sorghum varieties and yellow corn. Poultry Science 69: 11471155CrossRefGoogle Scholar
Douglas, J.H., Sullivan, T.W., Bond, P.L. and Robeson, L.G. (1991 a) Chemical composition and nutritional value of shattercane for broilers. Poultry Science 70: 408411CrossRefGoogle Scholar
Douglas, J.H., Sullivan, T.W., Abdul-Kadir, R. and Ruprow, J.H. (1991 b) Influence of infrared (micronization) treatment on the nutritional value of corn and low– and high–tannin sorghum. Poultry Science 70: 15341539CrossRefGoogle Scholar
Douglas, J.H., Sullivan, T.W., Gonzalez, N.J. and Beck, M.M. (1993) Differential age response of turkeys to protein and sorghum tannin level. Poultry Science 72: 19441951CrossRefGoogle Scholar
Elkin, R.G., Featherston, W.R., and Rogler, J.C.. (1978 b) Investigation of the leg abnormality in chicks consuming high–tannin sorghum grain diets. Poultry Science 57: 757762CrossRefGoogle ScholarPubMed
Elkin, R.G., Rogler, J.C., and Featherston, W.R.. (1978 a) Influence of sorghum grain tannins on methionine utilization in chicks. Poultry Science 57: 704710CrossRefGoogle Scholar
Elkin, R.G., Rogler, J.C. and Sullivan, T.W.. (1990) Comparative effects of dietary tannins in ducks, chicks, and rats. Poultry Science 69: 16851693CrossRefGoogle ScholarPubMed
Elkin, R.G., Rogler, J.C., and Sullivan, T.W.. (1991) Differential response of ducks and chicks to dietary sorghum tannins. Journal of the Science of Food and Agriculture 57: 543553CrossRefGoogle Scholar
Elkin, R.G., Freed, M.B., Hamaker, B.R., Zhang, Y. and Parsons, C.M. (1995) Condensed tannins are only partially responsible for variations in nutrient digestibilities of sorghum grain cultivars. Poultry Science 74 (Suppl 1): 125 (abstract)Google Scholar
El Zubeir, E.A. and Jubanah, S.K. (1993) Nutritional evaluation of sorghum germ meal as a substitute for sorghum in broiler diets. Animal feed Science and Technology 44: 93100CrossRefGoogle Scholar
El Zubeir, E.A. and Mustafa, E.A. (1992) The replacement value of sorghum gluten meal for soya–bean meal in broiler chick diets. Animal Feed Science and Technology 36: 339342CrossRefGoogle Scholar
El Zubeir, E.A., Elbashir, T.E. and Salih, A.M. (1990) Sorghum gluten feed in poultry diet: effect on broiler performance and sensory evaluation of carcasses. Journal of the Science of Food and Agriculture 52: 215219CrossRefGoogle Scholar
Featherston, W.R. and Rogler, J.C. (1975) Influence of tannins on the utilization of sorghum grain by rats and chicks. Nutrition Reports International 11: 491497Google Scholar
Flores, M.P., Castanon, J.I.L. and Mcnab, J.M. (1994) Effect of tannins on starch digestibility and TMEn of triticale and semi purified starches from triticale and field beans. British Poultry Science 35: 281286CrossRefGoogle Scholar
Fry, J.L., Herrick, G.M., and Harnms, R.H.. (1972) Effect of bird–resistant sorghums and tannic acid on yolk mottling. Poultry Science 51: 15401543CrossRefGoogle Scholar
Giesemann, M.A., Lewis, A.J., Peo, E.R. JR., Grabouski, H.A. and Danielson, A.D. (1992) Acid steeping of corn and grain sorghum: effect on nutrient digestibility in growing pigs. Animal Feed Science and Technology 37: 233243CrossRefGoogle Scholar
Gontzen, I. and Sutzescu, P. (1968) Natural Antitzutritive Substances in Feedstuffs and Forages, 1st edn, Karger, Base1Google Scholar
Griffiths, D.W. (1979) The inhibition of digestive enzymes by extracts of field beans (Vicia faba). Journal of the Science of Food and Agriculture 30: 458462CrossRefGoogle Scholar
Griffiths, D.W. and Moseley, G. (1980) The effect of diets containing field beans of high or low polyphenolic content on the activity of digestive enzymes in the intestines of rats. Journal of the Science of Food and Agriculture 31: 255259CrossRefGoogle ScholarPubMed
Gualtieri, M. and Rapaccini, S. (1990) Sorghum grain in poultry feeding. World Poultry Science Journal 46: 246254CrossRefGoogle Scholar
Gujer, R., Magnolato, D. and Self, R. (1986) Glucosylated flavonoids and other phenolic compounds from sorghum. Phytochemistry 25: 14311436CrossRefGoogle Scholar
Gupta, R.K. and Haslam, E. (1980) Plant polyphenols. In: Sorghum and Millets: Their Composition and Nutritive Value (Eds Hulse, J.H., Laing, E.M. and Pearson, O.E.), Academic Press, London, pp. 302318Google Scholar
Hagerman, E.A. and Butler, L.G. (1980) Condensed tannin purification and characterization of tannin–associated proteins. Journal of Agriculture and Food Chemistry 28: 947952CrossRefGoogle ScholarPubMed
Hahn, D.H., Rooney, L.W., and Earp, C.F.. (1984) Tannins and phenols of sorghum. Cereal Foods World 29: 776779Google Scholar
Halley, J.T., Nelson, T.S., Kirby, L.K. and York, J.O. (1986) Effect of tannin content of sorghum grain in poultry rations on dry matter digestion and energy utilization. Arkansas Farm Research Agricultural Experiment Station, University of Arkansas, Fayetteville, Arkansas 35 (2): 8Google Scholar
Harris, H.B. and Burns, R.E. (1973) Relationship between tannin content of sorghum grain and preharvest seed moulding. Agronomy Journal 65: 957959CrossRefGoogle Scholar
Haslam, E. (1981) Vegetable tannins. In: The Biochemistry of Plants, Vol. 7 (Ed Conn, E.E.), Academic Press, New York, pp. 527544Google Scholar
Hoshino, T. and Duncan, R.R. (1981) Bird damage and tannin content in grain sorghum hybrids under different environments. Japanese Journal of Crop Science 50: 332337CrossRefGoogle Scholar
Huisman, J., Van Der Poel, A.F.B., Verstegen, M.W.A. and Van Weerden, E.J. (1990) Antinutritional factors (ANF) in pig nutrition. World Reviews of Animal Production 25: 7782Google Scholar
Hulse, J.H., Laing, E.M., and Pearson, O.E.. (1980) Sorghum and the Millets: Their Composition and Nutritive Value, Academic Press, LondonGoogle Scholar
Ibrahim, S., Fisher, C. El Alaily, H., Soliman, H. and Anwar, A. (1988) Improvement of the nutritional quality of Egyptian and Sudanese sorghum grains by the addition of phosphates. British Poultry Science 29: 721728CrossRefGoogle ScholarPubMed
Ibrahim, S., Mohammed, K.S., Soliman, H. and Anwar, A. (1991) Recommended levels of available phosphorus for broilers fed starting diets containing Sudanese sorghum. Nutrition Abstract Reviews (Series B) 61: 61 (abstract)Google Scholar
Jacob, J.P., Mitaru, B.N., and Mbugua, P.N.. (1992) Effect of substituting Kenyan brown sorghum for maize in broiler starter diets as influenced by dietary crude protein and methionine levels. Poultry Science 71 (Suppl 1): 13 (abstract)Google Scholar
Jansman, A.J.M. (1993) Tannins in feedstuffs for simple stomached animals. Nutrition Research Reviews 6: 209236CrossRefGoogle ScholarPubMed
Jansman, A.J.M., Frohlich, A.A. and Marquardt, R.R. (1994) Production of proline-rich proteins by the parotid glands of rats is enhanced by feeding diets containing tannins from Faba beans (Vicia faba L.). Journal of Nutrition 124: 249258CrossRefGoogle ScholarPubMed
Katz, S.H., Hediger, M.L. and Vallery, L.A.. (1974) Traditional maize processing in the New World. Science 184: 765773CrossRefGoogle ScholarPubMed
Khalifa, N.A. and El Zubeir, E.A. (1990) Effects of sorghum gluten feed on the performance of laying hens and on egg quality. Journal of the Science of Food Agriculture 53: 415417CrossRefGoogle Scholar
Khalifa, N.A., El Zubeir, E.A. and Mustafa, E.A. (1994) Use of sorghum gluten feed as a substitute for soyabean meal in layer diets. Animal Feed Science and Technology 48: 165168CrossRefGoogle Scholar
Kramer, N.W. (1959) Sorghum. In: The Cheinistry and Technology of Cereals as Food and Feed (Ed. Matz, S.A.). Avi Publishing, Westport, Cconnecticut, pp. 120136Google Scholar
Leeson, S. and Summers, J.D. (1991) Commercial Poultry Nutrition. University Books, Guelph, Ontario, CanadaGoogle Scholar
Longstaff, M. and Mcnab, J.M. (1991) The inhibitory effects of hull polysaccharides and tannins of field beans (Vicia faba L.) on the digestion of amino acids, starch and lipid and on digestive enzyme activities in young chicks. British Journal of Nutrition 65: 199216CrossRefGoogle Scholar
Luis, E.S. and Sullivan, T.W. (1982) Nutrient composition and feeding values of Proso millets, sorghum grains, and corn in broiler diets. Poultry Science 61: 311320CrossRefGoogle Scholar
Mahmood, S. and Smithard, R. (1993) A comparison of effects of body weight and feed intake on digestion in broiler cockerels with effects of tannins. British Journal of Nutrition 70: 701709CrossRefGoogle ScholarPubMed
Martin, M.M. and Martin, J.S. (1984) Surfactants: their role in preventing the precipitation of proteins by tannins in insect guts. Oecologia (Berlin) 61: 342345CrossRefGoogle ScholarPubMed
Mcmillian, W.W., Wiseman, B.R., Burns, R.E., Harris, H.B. and Greene, G.L. (1972) Bird resistance in diverse germplasm of sorghum. Agronomy Journal 64: 821822CrossRefGoogle Scholar
Mehansho, H., Butler, L.G. and Carlson, D.M. (1987) Dietary tannins and salivary proline rich proteins: interactions, induction, and defence mechanisms. Annual Reviews of Nutrition 7: 423440CrossRefGoogle Scholar
Mehansho, H. Asquith, T.N., Butler, L.G. and Rogler, J.C. (1992) Tannin-mediated induction of proline-rich protein synthesis. Journal of Agricultural and Food Chemistry 40: 9397CrossRefGoogle Scholar
Meyer, R.O. and Gorbet, D.W. (1984) Waxy and normal grain sorghums with varying tannin contents in diets for young pigs. Sorghum Newsletter 27: 51Google Scholar
Mitaru, B.N., Reichert, R.D. and Blair, R. (1983) Improvement of the nutritive value of high tannin sorghums for broiler chickens by high moisture storage (reconstitution). Poultry Science 62: 20652072CrossRefGoogle ScholarPubMed
Mitaru, B.N., Reichert, R.D. and Blair, R. (1984) The binding of dietary protein by sorghum tannins in the digestive tract of pigs. Journal of Nutrition 114: 17871796CrossRefGoogle ScholarPubMed
Mitjavila, S., Lacombe, C., Carrera, G. and Derache, R. (1977) Tannic acid and oxidised tannic acid on the functional state of rat intestinal epithelium. Journal of Nutrition 107: 21132121CrossRefGoogle ScholarPubMed
Mohammed, T.A. and Ali, O.M. (1988) Effect of wood ash extract treatment on the feeding value and utilization of high-tannin sorghums by broiler chicks. Animal Feed Science and Technology 22: 131137CrossRefGoogle Scholar
Mole, S. (1989) Polyphenolics and the nutritional ecology of herbivores. In: Toxicants of Plant Origin. Vol. 4, Phenolics (Ed. Cheeke, P.R.), CRC Press, Boca, Raton, Florida, pp. 191223Google Scholar
Moran, E.T. Jr. (1982) Comparative Nutrition ofFozul and Swine. The Gastrointestinal Systems. Office for Educational Practice, University of Guelph, Guelph, OntarioGoogle Scholar
Morrall, P., Liebenberg, N.V.D.W. and Glennie, C.W. (1981) Tannin Development and Location in Bird Resistant Sorghrum Grain. Scanning Electron Microscopy III. Scanning Electron Microscopy Inc., A.M.F. O'Hare, Chicago, pp. 571576Google Scholar
Muindi, P.J. and Thomke, S. (1981 a) The nutritive value for rats of high– and low-tannin sorghums treated with magadi soda. Journal of the Science of Food and Agriculture 32: 139145CrossRefGoogle ScholarPubMed
Muindi, P.J. and Thomke, S. (1981 b) Metabolic studies with laying hens on the Tanzanian sorghum grains of different tannin contents. Swedish Journal of Agricultural Research 11: 1721Google Scholar
Muindi, P.J., Thomke, S. and Ekman, R. (1981) Effect of Magadi soda treatment on the tannin content and in vitro nutritive value of grain sorghums. Journal of the Science of Food Agriculture 32: 2534CrossRefGoogle ScholarPubMed
Mukuru, S.Z., Butler, L.G., Rogler, J.C., Kirleis, A.W., Ejeta, G., Axtell, J.D. and Mertz, E.T. (1992) Traditional processing of high-tannin sorghum grain in Uganda and its effect on tannin, protein digestibility, and rat growth. Journal of Agricultural and Food Chemistry 40: 11721175CrossRefGoogle Scholar
Musharaf, N.A. and Latshaw, J.D. (1991) Effect of tannin extraction on the feeding value of grain sorghum in broiler starter diets. Sudan Journal of Animal Production 4: 5364Google Scholar
Mustafa, E.A. and El Zubeir, E.A. (1993) Use of sorghum gluten feed as a substitute for soyabean meal in diet for broiler chicks. World Animal Review 76: 5861Google Scholar
Nelson, T.S., Stephenson, E.L., Burgos, A., Floyd, J. and York, J.O. (1975) Effect of tannin content and dry matter digestion on energy utilization and average amino acid availability of hybrid sorghum grains. Poultry Science 54: 16201623CrossRefGoogle Scholar
Neucere, N.J. and Sumrell, G. (1980) Chemical composition of different varieties of grain sorghum. Journal of Agricultural and Food Chemistry 28: 1921CrossRefGoogle ScholarPubMed
Nyachoti, C.M. and Atkinson, J.L. (1995) The effect of feeding high-tannin sorghum on digestive organ response and overall performance of broiler chicks. Poultry Science 74 (Suppl 1): 125 (abstract)Google Scholar
Nrc. (1994) Nutrient Requirements of Domestic Animals. Nutrient Requirements of Poultry. 9th edition. National Academy Press, WashingtonGoogle Scholar
Oh, H.L., Hoff, J.E., Armstrong, G.S. and Haff, L.A. (1980) Hydrophobic interaction in tannin-protein complexes. Journal of Agricultural and Food Chemistry 28: 394398CrossRefGoogle Scholar
Ortiz, L.T., Centeno, C. and Trevino, J. (1993) Tannins in faba bean seeds: effects on the digestion of protein and amino acids in growing chicks. Animal Feed Science and Technology 41: 271278CrossRefGoogle Scholar
Pan, H.P., Bullard, R.W. and Okono, I. (1980) “Bitter” taste in sorghum. Sorghum Newsletter 23: 116Google Scholar
Potter, D.K. and Fuller, H.L. (1968) Metabolic fate of dietary tannins in chickens. Journal of Nutrition 96: 187191CrossRefGoogle ScholarPubMed
Potter, D.K., Fuller, H.L. and Blackshear, C.D. (1967) Effect of tannic acid on egg production and egg yolk mottling. Poultry Science 46: 15081512CrossRefGoogle Scholar
Price, M.L., Butler, L.G., Featherston, W.R. and Rogler, J.C. (1978) Detoxification of high tannin sorghum grain. Nutrition Reports International 17: 229236Google Scholar
Price, M.L., Butler, L.G., Rogler, J.C. and Featherston, W.R. (1979) Overcoming the nutritionally harmful effects of tannin in sorghum grain by treatment with inexpensive chemicals. Journal of Agricultural and Food Chemistry 27: 441445CrossRefGoogle Scholar
Price, M.L., Van Scoyoc, S. and Butler, L.G. (1980) Tannin in sorghum grain: effect of cooking on chemical assays and on antinutritional properties in rats. Nutrition Reports International 21: 761767Google Scholar
Rayudu, G.V.N., Kadirve, R., Vohra, P. and Kratzer, F.H. (1970) Toxicity of tannic acid and its metabolites for chickens. Poultry Science 49: 957960CrossRefGoogle ScholarPubMed
Reichert, R.D., Fleming, E.S., and Schwab, D.J.. (1980) Tannin deactivation and nutritional improvement of sorghum by anaerobic storage of H2O–, HCl–, or NaOH-treated grain. journal of Agricultural and Food Chemistry 28: 824829CrossRefGoogle ScholarPubMed
Reichert, R.D., Mwasaru, M.A., and Mukuru, S.Z.. (1988) Characterization of coloured-grain sorghum lines and identification of high-tannin lines with good dehulling characteristics. Cereal Chemistry 65: 165170Google Scholar
Robbins, C.T., Hagerman, A.E., Austin, P.J., Mcarthur, C. and Hanley, T.A. (1991) Variation in mammalian physiological responses to a condensed tannin and its ecological implications. Journal of Mammalogy 72: 480486CrossRefGoogle Scholar
Rooney, L.W. and Pflugfelder, R.L. (1986) Factors affecting starch digestibility with special emphasis on sorghum and corn. Journal of Animal Science 63: 16071623CrossRefGoogle ScholarPubMed
Rostagno, H.S., Featherston, W.R., and Rogler, J.C.. (1973) Studies on the nutritional value of sorghum grains with varying tannin contents for chicks: growth studies. Poultry Science 52: 765772CrossRefGoogle Scholar
Scheuring, J.F., Sidibe, S., Rooney, L.W. and Earp, C.F. (1983) Sorghum pericarp thickness and its relation to decortication in a wooden mortar and pestle. Cereal Chemistry 60: 8689Google Scholar
Schutte, G.M. and Smith, G.A. (1991 a) A comparison of broiler performance on milled and unmilled sorghum-based diets. South Africa Journal of Animal Science 21: 111114Google Scholar
Schutte, G.M. and Smith, G.A. (1991 b) Untreated, sodium hydroxide– and formaldehyde–treated birdproof grain sorghum as energy source in broiler diets. South Africa Journal of Animal Science 21: 115119Google Scholar
Scott, M.L., Nesheim, M.C., and Young, R.J.. (1982) Nutrition of the Chicken, M. L. Scott and Associates., Ithaca, New YorkGoogle Scholar
Sell, D.R., Reed, W.M., Charisman, C.L. and Rogler, J.C. (1985) Mucin excretion and morphology of the intestinal tract as influenced by sorghum tannins. Nutrition Reports International 31: 13691374Google Scholar
Sell, D.R., Rogler, J.C., and Featherston, W.R.. (1983) The effects of sorghum tannin and protein level on the performance of laying hens maintained in two temperature environments. Poultry Science 62: 24202428CrossRefGoogle ScholarPubMed
Shem, M.N., Lekule, F.P., Zakayo, G.Z. and Eggum, B.O. (1990) Nutritive value of germinated and ungerminated high tannin sorghum for growing pigs. Acta Agriculture Scandinavica 40: 253258CrossRefGoogle Scholar
Sikka, K.C. and Johari, R.P. (1979) Comparative nutritive value and amino acid content of different varieties of sorghum and effect of lysine fortification. Journal of Agricultural and Food Chemistry 27: 962965CrossRefGoogle ScholarPubMed
Subramanian, V., Butler, L.G., Jambunathan, R. and Prasada Rao, K.E. (1983) Some agronomical and biochemical characters of brown sorghums and their possible role in bird resistance. Journal of Food Chemistry 31: 13031307CrossRefGoogle Scholar
Swain, T., Harborne, J.B. and Van Sumere, C.F. (1979) Biochemistry of Plant Phenolics, Plenum Press, New YorkCrossRefGoogle Scholar
Tamir, M. and Alumot, E. (1969) Inhibition of digestive enzymes by condensed tannins from green and ripe carobs. Journal of the Science of Food and Agriculture 20: 199202CrossRefGoogle ScholarPubMed
Tamir, M. and Alumot, E. (1970) Carob tannins, growth depression, and levels of insoluble nitrogen in the digestive tract of rats. Journal of Nntrition 100: 573580Google ScholarPubMed
Teeter, R.G., Sarani, S., Smith, M.O. and Hibberd, C.A. (1986) Detoxification of high tannin sorghum grains. Poultry Science 65: 667671CrossRefGoogle ScholarPubMed
Trevino, J., Ortiz, L. and Centeno, C. (1992) Effect of tannins from faba beans (Vicin faba) on the digestion of starch by growing chicks. Animal Feed Science and Technology 37: 345349CrossRefGoogle Scholar
Vohra, P., Kratzer, F.H. and Joslyn, M.A. (1966) The growth depressing and toxic effects of tannins to chicks. Poultry Science 45: 135142CrossRefGoogle ScholarPubMed
Waggle, D.H., Deyole, C.W., and Sanford, P.E.. (1968) Relationship of protein level of sorghum grain to its nutritive value as measured by chick performance and amino acid composition. Poultry Science 47: 655659Google Scholar
Wang, D.Y. and Fields, M.L. (1978) Germination of corn and sorghum in the home to improve nutritive value. Journal of Food Science 43: 11131115CrossRefGoogle Scholar
Wiseman, J. (1994) Tannins in Faba beans. In: Proceedings of the 9th Europem Poultry Conference, Vol. II, Glasgow, UK. World's Poultry Science Association, pp. 137140Google Scholar
Yapar, Z. and Clandinin, D.R. (1972) Effect of tannins in rapeseed meal on its nutritional value for chicks. Poultry Science 51: 222228CrossRefGoogle ScholarPubMed
Zucker, W.V. (1983) Tannins: does structure determine function? An ecological perspective. American Naturalist 121: 335365CrossRefGoogle Scholar