Just listen to the two winners of a gold (mini) slurry tank for lowest NH3 emissions per 100L of measured milk. Both just to high production before they stepped into the project.Mathijs on feeding at rumen level: "2 to 3 kg of hay in a cow ... you think, we're not going to milk from that ... and yet"Jan Willem on the nitrogen content in his manure : "I'm at barely 2kg, used to be 4.3kg and it's wonderful nutrition for the soil, excellent grass growth, but that 2kg is organically bound."