bald back chickens

[lindat01]

HELP

I have 12 chicken and 1 roo, all of my chickens look wonderful except for 4 they have bald backs.. I dont see any fighting or any of the other chickens pecking at them but something is happening. Anyone have any ideas of what I can put on their backs so the other chickens or Roo will not bother them.

 

[steelchair]

do a search for chicken saddles.

 

[lindat01]

thank you!!