US Patent 3,230,930 (granted January 25, 1966) describes a method of inducing moulting in silkworms reared on an artificial diet, by adding choline or its derivatives (choline chloride, acetylcholine chloride, lecithin and others) at not less than 500 gamma per gram of dried diet. The text gives the background on feeding factors in mulberry leaves, a basal diet recipe, two feeding experiments with result tables, and two claims. It is a divisional application assigned to Takeda Chemical Industries and Yasuji Hamamura, with no drawings.