The invention provides a method of changing a ratio of 68 to 64 kDa protein of MRJP3 in a royal jelly, a method of producing a royal jelly comprising MRJP3 having a changed ratio of 68 to 64 kDa protein relative to a control royal jelly and the royal jelly produced thereform. Also provided is a method of promoting the growth of the larva of a queen bee comprising feeding the larva of the queen bee a royal jelly of the invention. Further provided is a method of producing bee larva, pupa and queen bees with sizes larger than normal.
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