Combi-Fer, 12.5 kg Combi-FER is a dietary iron-containing supplementary feed, which via 2 allocations per Litter is used as a supplement to the primary iron allocation (irrespective of the iron source), where there is a need to increase the hemoglobin level before weaning ("hemoglobin boost"). Combi-FER contains potato fibers and is supplied in a 12.5 kg bag (enough for approx. 1,560 piglets).