The goal is to obtain more information from the planning chart and to record the information more easily. By writing down directly onto the planning chart card we keep a very interesting information that would be lost if we used magnets.
Explanation
The production planning chart provides us with a lot of information: it identifies the production stage of the production batches and of all the sows on our farm, and it defines the tasks to perform on them at every moment.

Nevertheless, on the traditional metallic planning charts, on which each sow is identified with a magnet, a great deal of useful information is lost: the control of the sows with a reproductive failure.
The magnet of the sow that "fails" (return to oestrus / negative at pregnancy diagnosis/ dead / culled / aborted…), is relocated on the place corresponding to the new matings, or it disappears if the sow is removed from the farm. In this way, the following information is lost:
By using a planning chart where the number of the sow is written down directly onto a piece of paper or a card, this information is not lost.

Other additional advantages: