Ok so i have 3 sick hens, they all seem to have upper respiratory infections. They are all three just over a year old- ones a Speckled Sussex, ones a light brahma, ones a silver lakenvelder. I have raised all three since babies and about 2 weeks ago i lost my bantam SS to a coyote. I have been told i should cull since im starting a silkie breeding pen. I really dont want to cull and feel horrible just thinking about it. . Do i cull them for the sake of my breeding pen which the layers were here first or risk the silkies health too. . I just dont know what i can do.