Milk Replacer Profit Generator Calculator The following are default figures. Please change these numbers to reflect your current production. After making all required entries, hit CALCULATE to see the results for your swine operation. Lactation length days Wean to service interval days Number of sows Increased pigs weaned/litter Pig value at weaning $ Pigs weaned/litter Improved wean wt/pig lbs Value per unit pig wt $ /lb Milk replacer intake/pig lbs Cost of milk replacer $ Feeding System Investment Cost/Crate $