I recently purchased four pullets, two RIR x New Hampshire, one australorp and one isa brown. The australorp is probably 9-10 weeks now and the others are likely aobut 14 weeks old. I was initially concerned aobut hte little australorp with the others being that big bigger, but alas she is fine. The fella that sold me the cross pullets said to keep them in the run for about 2-3 weeks. they have been in the run for around 1.5 weeks. Since Saturday 4 days ago I have noticed the RIRxNewHamps having a go at the Isa Brown. They will peck at her sometimes when she gets close. She is always trying to get out of the run when I go there to feed them, more interested in getting into the yard space than the food. When I make her get back in the two reds peck her. I noticed tonight that she is losing some feathers on the back of her neck. I am not sure if this is where she is getting pecked as I am usually controlling my kids around the chickens than focusing on that stuff and it all happens so quickly. 1. could the loss of feathers be due to what they are doing to her? 2. Should I let her into the yard part despite them onyl being in the run 1.5 weeks?