What historically caused the parti pattern to appear less frequently in mainstream Miniature Schnauzer breeding lines?

Answer

Early breeders often culled or downplayed the gene pool, favoring deviations from the emerging ideal standard.

The parti pattern is noted as being present in the Schnauzer lineage since the breed's inception, appearing naturally in litters alongside standard colors. The reason for its reduced frequency in mainstream lines stems from historical breeding decisions. Early breeders focused intensely on establishing an 'ideal standard,' and any deviation, particularly colors perceived as complicating the breed's image or marketability, was often actively eliminated or de-emphasized through selective breeding practices aimed solely at meeting the prevailing recognition standards.

What historically caused the parti pattern to appear less frequently in mainstream Miniature Schnauzer breeding lines?
partiDogcolorbreedSchnauzer