First We Need To decide and Figure Out the Diameter, and Height Of the stair in order to allow the cow to be able to walk backwards down the stairs
We First will need to measure a thick enough diameter in order to have the cow step acually on the step how to do this find out the length and width of the cows foot.
After Figuring out the lengths of each step now w need to do the height, to figure this out we will require test subjects after figuring out what the best height that the cow feels confertable we now need to go to step 3
Now You Might disagree with me that cows cant walk down stairs backwards but let me finish!
GRASS IS THE MOST USELESS IDEA EVER!
We can use wood but it might have the chance of breaking, we can use concrete which is more durable and strong which the cow will like or finially grass to help he/she feel more safe
Step 3 is to determine what material is good enough to support the cows weight
Lets assume this is Test 1E shes a 1,800 pound cow who which we will be using she likes grass and is insanly heavy