There is a large sod farm not far from here, yep they spray more stuff than you can shake a stick at.
They spray insecticides for a worm that gets into the root system.
They use to use chicken manure until the EPA stopped them because it was leeching too much ammonia into the ground water so now they use a liquid slurry type that is metered thru the pivot irrigation systems.
They fertilize heavy for when they harvest the sod in 8 weeks it's ready to harvest again.
That's why when you buy sod you have to water it sooo heavy, because of the ammonia.
They also use UAN ( uretha ammonium nitrate in the liquid form.)
And as far as cow manure, what have they treated the pastures with?
Around these parts in the late spring they spray insecticides for army worms and such.
Not counting the 2-4-D for broad leaf plants which is has a very, very high cancer risk.