Show cod liver oil retains vitamin D efficiency As has been suggested by many poultry authorities it Is not necea nece s sary to make frequent new mixtures es of cod liver oil in mash in order to insure vitamin D potency if further tests agree with ne me reported at the kansas experiment station five all mash rations were prepared and tested upon chicks when the mash was freshly mixed when six months old and when one year old the feed was kept in burlap sacks and stored in a dry well vonti room where no sunshine en one per cent of tested cod liver oil was added at the time the t eed was mixed after storage six and twelve months this feed con talked enough vitamin D to prevent rickets in chicks up to eight weeks of age |