Lash eggs can come in various colors, shapes and sizes. It's actually not flesh, it is an accumulation of infection wrapped up in layers of pus. Quite odd looking stuff. Salpingitis, if caught very early can sometimes be treated short term with antibiotics. Do you have a vet?Probably just a lash egg, but it sure look convincingly like a chicken fetus. Probably over-active imagination, but certainly a lot of flesh to come out of a living chicken.