that’s 250 gals per cow per day.
Highly sceptical of those numbers
I get 25 gallon/cow/day. That is liquified manure. I don’t know what the ratio would be...it would take a lot of added water to make the manure from my 3 horses liquid.
” A mature dairy cow weighing 1,400 pounds can generate around 14 gallons (about 120 pounds or 1.9 cubic feet) of feces and urine each day with an average as-excreted solids content of around 12 percent.”
http://www.extension.org/pages/15476/liquid-manure-storage-ponds-pits-and-tanks#.VLsKtB1ozgE
So less than a 50:50 water addition would get you to the figure cited.
The actual waste from one cow is more like a large scoop shovel of semi-solid and several gallons of urine per day. Much water is added for handling via pumps.
That would be 25 gallons a day per cow.
25 X 11,000 X 365 days==100,375,000 gallons
100,000,000 gallons manure per year / 11,000 cows = 9,090.91 gallons of manure per cow per year ...
9,090.91 gallons manure per cow per year / 365 days per year = 24.91 gallons per cow per day ...
Not 250 gallons
Survey says ... Believable