The present invention relates to a functional fermented feed (TMF) for promoting rumen development using anaerobic solid fermentation and a manufacturing method thereof, and more particularly, by using whey and citrus fruit by-products, which are by-products, to reduce production costs and utilize the by-products without disposal. Not only can the starter manufacturing process be simplified, the cost can be reduced, and the feed intake increased by improving the palatability of the feed due to the complete fermentation of yeast and lactic acid bacteria, the immunity increased by lactic acid bacteria, and the growth of putrefactive bacteria due to the low pH of the citrus fruit by-product. It relates to a functional fermented feed (TMF) that promotes rumen development using anaerobic solid fermentation, which has the advantages of improving feed storage according to suppression, increasing the flow rate of dairy cattle, and preventing rumen villi from falling out of ruminants due to the action of yeast, and a method for manufacturing the same . The method of a functional fermented feed (TMF) for promoting rumen development using anaerobic solid fermentation according to the present invention includes a starter culture step of culturing a starter by adding molasses and CMS (Condensed Molasses Solubles) and inoculating yeast and lactic acid bacteria as a starter; An anaerobic solid fermentation step of adding whey, a by-product of dairy production, to the main raw material containing wheat blood, soybean meal, corn powder, and protein skin, and inoculating yeast and lactic acid bacteria cultured in the starter culture step to perform solid fermentation under anaerobic conditions; It is characterized in that it includes a fermentation feed manufacturing step in which roughage and tangerine gourd are added to the solid fermented culture obtained in the anaerobic solid fermentation step and mixed.
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