| 摘要 |
PROBLEM TO BE SOLVED: To prevent quality degradation, caused by falling down of the cow by forming a floor hardly causing slip to fall down in walking of the cow. SOLUTION: A cow floor Y of concrete, composing a floor surface 12 on which the cow can walk, is provided, wherein many projection parts 30 projecting from a general surface 28 of the floor surface 12 are formed like lines on the floor surface 12, the projection parts 30 are formed to be truncated cones by making the diameter D of the bottom face 31 of the projection parts 30 to be 40 mm≤D≤190 mm, the diameter d of an upper surface 32 to be 10 mm≤d≤180 mm and the height H to be 3 mm≤H≤20 mm, and the pitch P in the line direction of the projecting part 30 is made 100 mm≤P≤200 mm. COPYRIGHT: (C)2010,JPO&INPIT
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