Hi there.I have 2 silkie chicks and one is a rooster from blood test. I want to avoid agressive behavior and Caponizing is out of the question.
I am in USA and am not sure the laws or where I could find it online.
He is a house rooster ESA pet. He is 6 weeks old today.
Any ideas or websites to help me?

Why is caponizing out of the question? Just curios as I am here to learn also.

As far as I can tell your method in question is only approved for use in ferrets in the US...
http://www.poultrydvm.com/drugs/deslorelin
Looks like it also has may have to be repeated regularly and may become less effective with time.
The majority of cockerels I have raised were indeed NOT aggressive. But the ones who were (Stew Pidasso's) were showing signs by six weeks old... including biting the hand that reaches in to feed it.
I suspect crowing may be more of a reason than aggression for an "ESA" house rooster be addressed in this manner... Plenty of folks keep cockerels and roosters with no aggression issues. Consider re-homing the pullet to keep his behavior in line, maybe.

Seeking the advice of an avian vet is truly the best advice given!

Hope it works out for you!

Pics always welcome!
