Complex sentence: The Angora stock can be either Colored (CAGBA) and/or Standard white (AAGBA); preferably, Nigoras should not be more than 75% or less than 25% of either parent breed.
Split into simpler sentences: The Angora stock can be either Colored (CAGBA) or Standard white (AAGBA). Preferably, Nigoras should not be more than 75% or less than 25% of either parent breed.