If is impossible to create your own animals at farrowing, you must check if your herd number pool is expired. Go to “Breeding” and choose “Herd number pool”. Double-click on the herd number and make sure there are still numbers available in your pool. If there are no more numbers left, you can change the number pool, but make sure that you do this in the right way and contact your breeding company if you have any doubts. An example of a herd number pool with more numbers left: