Feed mixer classification and the advantages and disadvantages of everyday life, we usually feed mixer commonly used are vertical and horizontal. Vertical mixer mixing time is usually 15 minutes --- 20 minutes, about 10 minutes, compared with the horizontal plane. Mixing should feed batch grinding stirring. Vertical mixer and horizontal mixer what advantages and disadvantages of small vertical feed mixer is advantageous in that mixed feed mixer accessories, consume less power;? Drawback is the long time mixing agricultural feed mixer, feed mixer low productivity, loading, discharging no fully. Horizontal mixer has the advantage of high efficiency, charging, discharging agility; drawback is that power consumption is large, large area, corresponding offer higher TMR feed mixer physical effective neutral detergent fiber and neutral detergent fiber (Neutraldetergentfiber. , NDF) is one of the key indicators of the modern dairy cow nutrition considerations. Actual production, formulated as a guide to NDF diets, although theoretically meet the needs of the cow, but the animals will still be rumen acidosis, milk fat reducing phenomenon. This is mainly NDF index reflects only the cows ideal requirements for fiber, and does not consider the validity of physical traits or physical fiber. To this end the feed mixer manufacturers, Mentersl1 proposed physical effective NDF (physicallyeffectiveneutraldetergentfiber, peNDF) concept. peNDF refers to the physical properties of the fiber (mainly fragment size), to stimulate the animals chewing activity and rumen contents to establish a two-phase stratified capacity, measured by the index was mainly animal chewing activity, rumen pH and Milk Fat and the like. Currently foreign scholars in terms peNDF made some progress, Plaizier and other different cutting length alfalfa hay and corn silage fed cows, the results show that the short alfalfa can increase total rumen volatile fatty acids (TVFA), but does not affect the rumen pH value and intake; and the shorter cows can increase corn silage dry matter intake and rumen pH values, but no significant effect on the rumen TVFA. Kowsar other reports, partial replacement of corn silage short of alfalfa hay cows can increase dry matter (DM), NDF and peNDF intake and improve rumen pH and milk protein and lactose content, but has no effect on milk fat. Domestic related research reports about peNDF is still relatively small. In this experiment, cows fed different levels of dietary peNDF study its rumen fermentation parameters of influence, provide the basis for the application of this indicator peNDF production in dairy cows. Agricultural feed mixer feed mixer _ _ music farmer farming machinery Urban Peasant music provided by fat Farming Machinery Co. Fertilizer urban farmers music Farming Machinery Co., Ltd. (www.nongminle.net) strong, credible, in Tai'an, Shandong feed processing machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead farmers farming machinery and you work music into the brilliant, for a better future!