Isa Brown - Roo or Hen

[mlanyi4]

This is Maisy, she’s a 9 week old Isa Brown. This is my first time with chicks/chickens. She has a much more aggressive personality than her siblings. However, she looks pretty dang similar to them.
Any thoughts that she could actually be a rooster?
Thanks!

 

[Rose the Legbar]

100% Pullet

 

[AinaWGSD]

Nope, all girl. ISA brown are sex-linked, the males are a completely different color than females.

Boys look like this (picture from townline hatchery)

 

[fluffycrow]

×3

Aggression is not a foreign concept to ISA browns

 

[mlanyi4]

×3

Aggression is not a foreign concept to ISA browns

We’re having a hard time introducing 4 others to her specifically. They’ve been in a see don’t touch coop/run for a week, but the last two times we did supervised interactions she was unkind to say the least.

Nope, all girl. ISA brown are sex-linked, the males are a completely different color than females. View attachment 3816817
Boys look like this (picture from townline hatchery)

Thank you!!

100% Pullet

Thank you!!

 

[fluffycrow]

We’re having a hard time introducing 4 others to her specifically. They’ve been in a see don’t touch coop/run for a week, but the last two times we did supervised interactions she was unkind to say the least.

Thank you!!

Thank you!!

One week is not enough, IMO. I try to do at least to weeks before removing the barrier, but some of my past ISA browns were just mean no matter what. It does t help if the birds you're trying to introduce are younger/more skittish

 

[mlanyi4]

One week is not enough, IMO. I try to do at least to weeks before removing the barrier, but some of my past ISA browns were just mean no matter what. It does t help if the birds you're trying to introduce are younger/more skittish

I’ll give it another week then. Thanks for the advice. My introduction flock has been hand raised so they’re pretty confident in general. (2 barred rock, 1 RIR, and 1 who knows what lol).

 

[The Moonshiner]

Aggression is not a foreign concept to ISA browns

Nor to females in general.

 

[Eggs_Over_EZ]

We purchased 9 Isa Brown’s in error (mix up by Rural King). I am surprised to hear about how they can be aggressive. Ours are the friendliest birds and get along even with the Speckled Sussex in the coop with them. Now we have at least one Sussex who seems to be trying to be crowned king of the coop. We observe him sometimes picking at the others. He is not horrible but definitely wants the alpha role. You know how those type A personalities can be.