Excuse me Mr. Vermeulen, but you are, to pardon the pun, full of manure. I drive a school bus through farmlands that have just been spread with manure from liquid tankers, the "old fashioned way", and I and my kids can tell you that when we pass a large (over 500) dairy farm that has just spread its load, as compared to a relatively small (100 or under) dairy, the smell is completely different. Try getting out to the country sometime and see for yourself. My kids and myself had all we could do to get all the windows up pronto after passing a large farm recently, the smell was horribly strong, with a chemical odor that was nearly overwhelming. Try riding in a crowded, hot school bus with the windows up because you can't stand to breath the air outside.
Also, I would like to challenge your concept of "old-fashioned". Old fashioned dairies didn't use the pandora's box full of antibiotics and hormones that are used now on cows, in order to push their milk production. I can tell the difference in the smell between a farm that doesn't use these pharmeceuticals and one that does. The manure from a heavily doped up cow crowd smells completely different than an "old-fashioned", or organic farm. And having once purchased some to use on my garden I can also tell you that the drugged up manure doesn't cook down properly either.