Explanation:

In cleaning and milking the cows, the wide middle alley is of great advantage. Lesser danger of spread of diseases from animal to animal. Cows can always get more fresh air from outside. The head gowala can inspect a greater number of milkmen while milking.
In tail to tail system, the central passage with gutter on the both sides of central passage is located in the centre of the shed. The feed mangers along with feed alley are arranged on either side of standing space of the animal.