between 3 and 4 months old
They start to "practice" at about 4 to 6 months old. They get full voice at about 8 to 10 months old.
All of my roosters start crowing around 5-6 months old. Roosters will usually make their first attempt at crowing between 5 and 8 weeks old. At that time the males in the flock will also start...
It depends. Some roosters start crowing when only 2 months old while others start at about 5 months old.
Spurs should be noticeable at about 8 months but can take longer to come in on certain breeds.