Look for inbreeding:

Genealogy:

Sonja

Breeder:
Mareline: Holstein 776
Chestnut mare - 1958 - Holst | xx : 6.25%
1952 - Holst | xx : 12.5%
1941 - Holst
1939 - Trak | xx : 25%
1941 - SWB | xx : 1.57%
1934 - Holst
1926 - Trak | xx : 12.5%
Trak | xx : 50%
1925 - SWB | xx : 3.13%
1914 - Holst
Holst
1916 - Trak
1921 - Trak
1919 - Hann
1918 - Hann
Holst
1905 - Holst
1914 - Holst
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