PROBLEM TO BE SOLVED: To obtain a meat quality improver suppliable in a rearing stage of livestock and cultured fishes in order to improve the meat quality of the livestock and cultured fishes and a feed comprising the meat quality improver. SOLUTION: This meat quality improver comprises ascorbic acid, its salts or derivatives thereof which are solids having =1.5 m average particle diameter, a glycerol ester of a fatty acid and a neutral lipid having =45 deg.C melting point.
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