Well, they'll certainly get pretty hungry. They would have to be fed some other feed ASAP or switched to a fresh pasture immediately, and not be allowed on that overgrazed pasture for at least 40 to 60 days to allow the grass to regrow and restablish itself. If we are talking about having these critters in the more defined seasons where there is no grazing for 5 to 6 months out of the year, they shouldn't be allowed on that pasture until a full year has passed. And even then they should NEVER be allowed to overgraze a pasture ever again. (This is the fault of the humans that the pasture got overgrazed, by the way, not the animals.)
There are 16 players in a field hockey team - 11 on the field and 5 substitutes. There is no limit on the number of substitutions allowed during the game, and they can happen at any time except during a penalty corner.
Field Combat happened in 1985.
Corkbush Field happened in 1647.
King's Field happened in 1994.
Field Commander happened in 2006.
Chaos Field happened in 2004.
22 players are allowed on the field for a play, 11 on offense, 11 on defense.
Only the first and third base coaches are allowed on the field while play is going on. If time is called the pitching coach, hitting coach or manager are allowed on the field.
You are only allowed 11 cards as a maximum on a field, you have five monster card slots, five spell/trap slots, and a Field Spell Card slot.
No, alcohol is allowed.
Yes.
Each team is allowed to have twelve players on the field at any one time (one more per side than in American football) and, technically speaking, all twelve are allowed to rush the quarterback. But I have never seen that happen.