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Problems can occur mixing breeds in a flock when you have, say, six chickens that are very similar looking (like Rhode Island Reds and New Hampshire Reds) and then one chicken who is of a very different type, like a Polish or a Faverolles.
Auto-Sexing Chicken Breeds As every backyard chicken breeder knows, the biggest challenge with raising chickens is that you often end up with far more roosters than you need. It takes only a single rooster to cover a flock of twenty hens, yet fully half of all the chicks that hatch are males.