Feeding the sow/gilt with litter
During the first couple of days feeding the sow her normal ration is adequate then from day three increase the feed for both the condition and maintenance of the sow/gilt and for the production of milk that is required to feed the piglets.
From day three up the feed gradually to 0.5kg per piglet per day and yes, depending on litter size will be a lot of food, so please split the food to three times a day if possible.