Translate the following English sentence to French:
"As far as I am concerned, every farmer can have as many cows as he chooses, as long as he does not exceed the 50 milligram limit."
En ce qui me concerne, libre à chaque agriculteur de garder autant de vaches qu' il le désire à l' hectare, pourvu qu' il ne dépasse par le seuil des 50 milligrammes de nitrate.