PROBLEM TO BE SOLVED: To provide a milk yield improving agent for improving milk yield of mammals and a milk yield improving method using the agent.;SOLUTION: The present invention provides a milk yield improving agent for mammals which contains vegetable crude lecithin which is preferably soybean crude lecithin as an active ingredient. The present invention also provides a livestock feed for mammals for improving milk yield which contains the milk yield improving agent for mammals. The present invention also provides a method for improving milk yield of mammals which includes feeding the milk yield improving agent for mammals to mammals.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT
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