probably i've never had bantam cochins. but i've feather sexed a cochin and a mix and while they never reached adult i know i was right. i don't claim to be an expert but feather sexing causes less pain to the chick than vent sexing and if you know what to look for is definatl accurate. except on silkies. they don't have primaries and secondaries.
Thanks. I'm still trying to get down the patterns as they grow. I think I might actually have more girls than boys with my hatch last week. That would be amazing. lol