Goats hate to eat their own poop, they avoid anything that even has hint of poop. All you have to do is spread their manure on the leaves a bit and the goats turn up their noses. Goat pee works too. I wonder if you could make a spray and this would detract goats?
It probably would work -- why don't you make some and give it a try, then report back? I'd love to know if it works, as I have goats. Most likely it would need to be reapplied frequently, and I wonder how that would affect the plants?
Probably best to use the manure of another non ruminant creature, as this will eliminate most chance of infection. However, will pig shit turn them off as much as goat?
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