Used 24 by 42 inch . Schonlau cast iron farrowing slats are second to none and have been proven to outperform any other sow flooring on the market – their strength, performance, and durability are unsurpassed. No other cast iron on the market achieves the physical characteristics, quality, and durability of the patented Schonlau cast iron floor. The cooler cast iron surface is preferred by the sows and keeps them more content. When producers increase sow’s comfort, it facilitates more feed intake which results in heavier weaning weights, which in turn leads to a better return on investment.