My Embdens are 4 weeks old.... I really cannot tell girls or boys apart... at what age should they show definite changes to discover what sex they are?
As far as feeding goslings. Start then on chick starter with high protein until they are 3 weeks old, then change to a 15%max protein and two weeks later go to 13%max. This is to prevent them from getting a condition called "Angel Wing" which is caused by prolonged feeding of a high protein...