My kids eat the haylage off the big bales we have, although I prefer it if its quite dry for the young ones, to prevent scours. Never had a problem up to press. Although I do prefer the youngsters to have hay if possible, but given the bad weather last year, and the quality of some of the hay, thats not been possible all the time.
None of my goats willl eat the small bales of haylage which are commercially bagged, such as haylage, and the ponies turn their noses up too. I found this out when I got a bale to take to a show last summer, and tried to feed the goats the leftover out of the bale the following day.....they did eat it eventually, but were not keen.