The invention discloses a 
fodder grass type fermented 
total mixed ration (TMR) for dairy cows and a preparation method thereof. The fermented TMR is prepared from the following raw materials in percentage by 
mass in terms of 
dry weight: 30 to 40 percent of 
fodder grass, 25 to 30 percent of 
forage crop silage, 5 to 10 percent of 
protein feed, 15 to 20 percent of energy feed, 1 to 2 percent of molasses, 5 to 10 percent of 
food processing by-products, 0.5 to 1.2 percent of premix compound, 1 to 2 percent of 
calcium hydrophosphate, 0.5 to 1 percent of 
stone dust, 0.2 to 0.3 percent of common salt, 0.4 to 0.6 percent of 
sodium bicarbonate and 0.1 to 0. 2 percent of 
magnesium oxide; wherein the raw materials are prepared into the 
fodder grass type fermented 
total mixed ration for medium and high yield dairy cows through the steps of weighing, 
water content adjustment, mixing, and 
fermentation after wrapping. A mixed batch obviously improves the quality of a feed after 
fermentation, effectively improves the feed intake of the dairy cows, improves the 
palatability and the digestibility of the feed, and can obviously improve the production performance of animals; the 
fermentation improves the storage performance of the feed, and makes a 
mixed feed have high aerobic stability, so the feed is convenient for commercialization, storage and transportation, and is favorable for modernized intensive feeding of the dairy cows. The technique has important practicability and application promotion values.