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Related Experiment Videos

The genetic basis for piebald patterns in cattle

T A Olson

    The Journal of Heredity
    |March 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    A dominant mutant (Bl) causes white faces in Simmental cattle, distinct from Hereford patterns. A multiple allelic series (SH, SCS, S+, s) and a Dutch Belted mutant (Bt) also influence cattle spotting patterns.

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    Area of Science:

    • Genetics
    • Animal Breeding
    • Dermatology

    Background:

    • Cattle coat patterns, particularly white facial markings, are important breed-defining characteristics.
    • Previous genetic studies have identified various mutations influencing coat color and pattern in cattle.

    Purpose of the Study:

    • To investigate the genetic basis of white facial patterns in Simmental and related cattle breeds.
    • To elucidate the allelic relationships and dominance hierarchy of genes controlling white facial and body patterns in cattle.
    • To identify the genetic factor responsible for the Dutch Belted cattle pattern.

    Main Methods:

    • Observational studies of cattle with distinct white facial patterns.
    • Pedigree analysis to track inheritance patterns of coat coloration.

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  • Comparison of mutant alleles and their interactions within and between breeds.

    • Main Results:

    • A dominant mutant, designated Bl, is identified as the cause of white facial patterns in Simmental cattle, independent of the Hereford pattern gene.
    • Evidence supports a multiple allelic series for spotting patterns: SH (Hereford), SCS (color-side), S+ (wild type), and s (recessive spotting).
    • Allelic interactions include codominance (SH, SCS), incomplete dominance (over S+), and complete dominance (over s).
    • The Dutch Belted pattern is likely controlled by an independent dominant mutant, Bt.

    Conclusions:

    • The Bl mutant provides a new understanding of white face genetics in cattle.
    • The identified allelic series (SH, SCS, S+, s) clarifies the genetic control of spotting patterns.
    • The Bt mutant suggests further genetic complexity in cattle coat coloration patterns.