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Biological evaluation of the protein nutritional value in the diets of rats based on cereals and the yeast Yarrowia lipolytica growing on industrial glycerol

Abstract The aim of this study was to evaluate the influence of the yeast Yarrowia lipolytica growing on industrial glycerol on the protein nutritional value of cereal grains. We prepared six isonitrogenous diets. Three diets were based on cereal grains (wheat, barley, or triticale) plus the yeast Y. lipolytica (consisting of 60% cereal protein and 40% yeast protein). For comparison, three diets were prepared in which the only sources of protein were wheat, barley, or triticale. The tested yeast Y. lipolytica has 46.7% crude protein in dry matter, is rich in lysine (6.22 g/16 gN) and threonine (4.18 g/16 gN), but contains little methionine (1.44 g/16 gN). In our experiment, diets consisting of 40% Y. lipolytica protein +60% wheat, barley, or triticale protein had higher (p<0.01) protein efficiency ratio and net protein ratio than diets based on cereals only. Cereal+yeast diets also have higher biological value and true digestibility (significantly for barley+yeast and triticale+yeast, at p<0.05) compared with diets based only on cereals.