Feed additive for preventing cannibalistic infanticide and preparation method thereof

The invention provides a feed for preventing cannibalistic infanticide and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing and mashing fresh and cleaned herba violae whole plant and pokeberry root whole plant, extracting with an ethanol aqueous solution, filtering to obtain filtrate, concentrating and drying to obtain an extract I; adding the extract I into a first part of water, stirring until the extract I is uniformly dispersed, adding quinoa, inducing germination to obtain germinated quinoa, adding the germinated quinoa into a second part of water, mixing and grinding to prepare slurry, continuously adding a neutral protease, stirring for enzymolysis, and drying to obtain an extract II; and adding the extract II and spina date seed powder into a third part of water, uniformly stirring and mixing to obtain a fermentation substrate, inoculating bacillus subtilis, fermenting, adding edible salt, uniformly stirring and mixing to obtain a fermentation product