Careful with haylage - hay much better as almost zero risk wrt listeriosis. Large commercial herds feed haylage as hay often difficult to get hold of, but then of course a small number of goats contracting (and most likely not surviving ..) is not too bad, whereas for the small scale keeper even the loss of one goat is difficult to accept. Listeriosis can of course be caught from the soil too, as that's where the bacteria live, but much less likely than from (badly) made haylage. Not worth the risk. Having said that I do sometimes (during the show season) feed Horsehage Alfalfa haylage to up the milk a bit - expensive though....
Re Copper - there is a lot of discussion/hype in the goat community atm, easiest way is to a) feed a dairy cow ration with added copper (18% protein dairy nuts) and have a red rockie available - that's all mine have and it has worked well for the last (nearly) 10 years. Unless you are in an area with serious deficiencies (speak to your vet, not your local agri merchant - they love to sell all sorts of supplements to you!), I personally would stay well clear of bolussing.
If you buy in the vast part of their feed - hay, concentrates and collect greenery from outside your holding, then testing your land may not be of much value....
My goats do love all sort of vegetables - they get carrots every day in autumn/winter (a large bag of pony carrots lasts about a week for 12 adults and 7 kids), plus cabbage, bananas and apples. I tend to restrict apples to about half per goat every other day, just it is quite acidic. All cut into thin sticks/slices.