"...at what age/development stage they start to become a gender and stay that way"
Monitors have sex chromosomes. Sex is determined when sperm meets egg at fertilization. Figuring out which ones are male and female when young is tricky. The odds (if you know how to calculate simple probability assuming 50% chance for male and 50% chance for female) go way up the more animals you have in your group. It's that simple.

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• what age 4 a positive gender ratio in - phantompoo, Sat Dec 22 18:51:45 2007
• RE: what age 4 a positive gender ratio in - jburokas, Sun Dec 23 19:41:42 2007
• RE: what age 4 a positive gender ratio i - phantompoo, Mon Dec 24 00:51:33 2007
• RE: what age 4 a positive gender ratio i - JME, Mon Dec 24 14:01:32 2007
• RE: Are you positive about that - FR, Mon Dec 24 22:38:36 2007
• RE: Are you positive about that - JME, Wed Dec 26 20:35:03 2007
• RE: Are you positive about that - FR, Wed Dec 26 22:45:24 2007
• Ive seen many ackies that could be sexed - SHvar, Thu Dec 27 11:06:09 2007
• RE: Ive seen many ackies that could be sexed - JME, Thu Dec 27 18:35:31 2007
• RE: Ive seen many ackies that could be sexed - FR, Thu Dec 27 19:11:25 2007
• RE: what age 4 a positive gender ratio in - sidbarvin, Mon Dec 24 19:42:47 2007
• RE: what age 4 a positive gender ratio in - FR, Thu Dec 27 16:50:09 2007
• Not monitors...but.... - MadAxeMan, Fri Dec 28 07:57:00 2007
• Humans - HappyHillbilly, Fri Dec 28 09:23:27 2007
• Serves you right - MadAxeMan, Fri Dec 28 20:46:19 2007
• RE: Serves you right - HappyHillbilly, Fri Dec 28 23:37:47 2007
• RE: Serves you right - MadAxeMan, Sun Dec 30 12:19:00 2007