to start off ancient hippy they sort of already have self milking cows and riderless tractors. I know I live on a farm. as for the pigs pooping bacon thats genetics and the current public has voiced they dont want to eat anything from geneticly modified things. but yes to go off from the two ancient hippy is close on, the cows in majory dairy opperations have mentally learned what times and where to go to get milked if there was a machine that detected the cow in the spot and moved the milker to the cow that would help. As for the riderless tractors there is already gps that allows the tractor to be on an auto-pilot setting when going up and down the field but it needs to be developed to turn the tractors around.
Ok but if you make one I want the first one. An automatic scare crow. Something that runs on a wire around the field barking or talking. Maybe runs forward then stops runs backwards for a while. The wire should be like fence wire cheap. It could run on a trolley type system and should be loud enough to keep the deer scared off. Could save farmers thousands.
I grew up on a big farm & I'm an inventor ! A gate latch that when you swing it shut it latches shut when it hits the post and I am also a certified welder and in my mind I know how to make one and it will work !