The goat due date is calculated using the following formula:
For standard breeds:
\[ \text{Due date} = \text{Date of mating} + 150 \text{ days} \]
For miniature breeds:
\[ \text{Due date} = \text{Date of mating} + 145 \text{ days} \]
Remember that the kids may come up to five days earlier or later than the result given.