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Table 2 Kinship between individual animals

From: Thrombocytopenic purpura on an organic farm with pen mating: a case report on the re-emergence of an old disease

IID1

IID2

Proportion of identity by descent

Kinship

Piglet 1

Piglet 2

0.44

Siblings

Piglet 1

Sow

0.50

Child - mother

Piglet 1

Boar 1

0.50

Child – father

Piglet 1

Boar 2

0.00

Unrelated

Piglet 1

Boar 3

0.00

Unrelated

Piglet 2

Sow

0.51

Child – mother

Piglet 2

Boar 1

0.50

Child – father

Piglet 2

Boar 2

0.00

Unrelated

Piglet 2

Boar 3

0.00

Unrelated

Sow

Boar 1

0.00

Unrelated

Sow

Boar 2

0.00

Unrelated

Sow

Boar 3

0.03

Unrelated

Boar 1

Boar 2

0.00

Unrelated

Boar 1

Boar 3

0.00

Unrelated

Boar 2

Boar 3

0.16

Slightly related

  1. The higher the proportion of identity by descent (IBD), the more related are two animals. Identical animals would have an IBD of 1. Close relationships, such as siblings or parent – offspring kinships have a proportion of IBD of about 0.5. As expected, the two piglets and the piglets and the mother show a high portion of IBD. The piglets and boar 1 equally show a high proportion of IBD while they are clearly unrelated to the other two boars (pairings in bold letters)