Early indicators of iron deficiency in piglets

Dear Daktari

My name is Mr Odanga, a pig farmer from Porti, Busia County, and a regular reader of Smart Harvest. I have been keeping pigs for some time now. In the beginning I let them walk in the farm in search of feeds. Due to their destructive rooting behaviour, which was causing me trouble with neighbours, I decided to confine them and feed them from there. The piglets are not growing as fast as they used to do and are now taking long time to attain market weight, which is negatively affecting my business. Some of them are weak, pale and I have lost some, which was not happening initially. I'm yet to call in a vet, but I wish to get your advice on what I need to do to avoid this problem.