- 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: "M", "F", "U". 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 of exit dates
- age
-- numerical vector of age in years