| 0 | = | Lactation started with a normal calving |
| 1 | = | Lactation started with an abortion (including induced abortions) |
| 2 | = | Fresh date field does not contain actual calving date (e.g. date entered herd, or date of hormonal induction of lactation) |
| 8 | = | Birth date is stored in calving date column to store events before first calving. The lactation number is set to 0. |
| 9 | = | No lactation information has been received for this cow/calving date/herd code combination |