[henkeeper]

My gold partridge bantam hen who is about 4 yrs old has changed colour.  Quite a few of her breast feathers are black and she has grown hackle and saddle feathers like the cockerel.  Can anyone tell me what is going on?

[barley]

  :blink: -- nope not a clue !!!!! weird

[Aunt Sally]

I presume she's stopped laying.

[Aunt Sally]

http://wiki.answers.com/Q/Can_a_chicken_change_its_gender

http://www.merckmanuals.com/vet/poultry/disorders_of_the_reproductive_system/sex_reversal_in_poultry.html?

[ANHBUC]

I have heard of this but never seen it, apart from one of my hens growing spurs. 

[BIG ZOOK]

Hens only use one ovary tract  and are quite capable to reverse their gender if needs must  .Honest.

[henkeeper]

Thank you for all your replies and links, I thought I had heard hens can display male characteristics. 

[Helenaj]

Hens only use one ovary tract  and are quite capable to reverse their gender if needs must  .Honest.

Yes, but they are not fertile - they cannot "father" chicks!