Look for inbreeding:

Pedigree:

Dorette

Breeder:
Mareline: Holstein 18B1
Black brown mare - 1945 - Holst
1941 - Holst
1940 - Holst
1934 - Holst
Holst
1929 - Holst
1923
1932 - Holst
1931 - Holst
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