- id
-- character column of animal IDs
- sire
-- the male parent of the animal indicated by the id
column. Unknown sires are indicated with NA
- dam
-- the female parent of the animal indicated by the id
column. Unknown dams are indicated with NA
- sex
-- factor with levels: "F", "M". Sex specifier for an
individual.
- gen
-- generation number (integers beginning with 0 for the founder
generation) of the animal indicated by the id column.
- birth
-- Date vector of birth dates
- exit
-- Date vector, all NA (no exit dates are recorded
in this obfuscated pedigree)
- age
-- numerical vector of age in years