There is a wide range of "show quality" It really depends on how much fluff you have on those birds and if that fluff will allow a connection between the male and female. I have had zero fertility with my mottleds and never a problem with the columbians and milles. Blacks, whites, buffs and mottled SQ are very round and I would think those varieties would need AI'd or trimmed in order to reproduce. Some patterned varieties like laced and newer varieties like mille and lavender are still developing their type and are not as round.
The true basketball shaped bantam cochin will have some difficulty breeding. Hatchery birds will not give you a problem.
Aside from breeding issues, these birds also need some special attention on their feet as feathers and fluff will cover this area preventing scaley leg mite and sores from being obvious. Sudden weight loss can also slide under the radar so be sure to handle them often.
The true basketball shaped bantam cochin will have some difficulty breeding. Hatchery birds will not give you a problem.
Aside from breeding issues, these birds also need some special attention on their feet as feathers and fluff will cover this area preventing scaley leg mite and sores from being obvious. Sudden weight loss can also slide under the radar so be sure to handle them often.