In the minor leagues, the rosters are managed in quite a different manner than the standard 25-man rosters in the majors. Minor league teams keep two separate lists of players. The first is the Active List which, like in the NFL, denotes which players are eligible for the current game while the second list, the Reserve List, is the entire roster of the team.
AAA and AA clubs are allowed to put 24 players on the Active List for the first 30 days of the season, 23 players on the Active List from the 31st day until August 10th and then 24 players again for the rest of the season, including the playoffs. The Reserve List limit, however, is always 38 players for AAA and 37 players for AA teams.
For A teams, the Active List limit is 25 players, for Short-Season A teams, 30 and for Rookie Teams, 35. All levels below AA allow clubs a Reserve Limit of 35 players. Below A-ball, only 25 players may actually get into a single game.
Players may be loaned to other minor league organizations, but must be returned by September 30.
As in the majors, there are two disabled lists. The normal disabled list only has a 7-day minimum as opposed to the 15 days used as the limit for the majors. The 60-day DL, or Emergency Disabled List, works the same as in the majors; the player doesn't count against any roster limits but cannot be reinstated until either 60 days have passed or the season ends.