Batch Farrowing Place
Weaning age
The batch farrowing
place easily predicts the age of the piglets at weaning.
Once the number of animals on each day post-weaning is known the farrowing date
and thus the weaning age can be predicted.
It is difficult to change your weaning age unless you are going to change your weaning date. Weaning ages can only change by the length of the batch.
Weaning age
If the farm practices 3 week weaning, then piglets less than 21 days of age are inevitable as the average is less than 21.
Thus these system is illegal within the EU. 91/630 This can be readily identified in farm records - farms with 3 week weaning have 20 batches of gestating sows rather than 21 as required by 4 week weaning.
Note other models are available for