Feathers may have started as simple filaments in ancient dinosaurs, but a team of Swiss researchers is digging deep into the ...

Chicken sexers go through a training process ... show signs of comb growth at three to four weeks. 2. Hackle and saddle feathers Each gender has a distinct shape to these feathers.

Initially, the researchers administered estrogen (E2) capsules to male chickens, which induced ... system in the sexual ...