Show L I 1 MON 3 MINERAL NEEDS FOR SWINE HERD interesting experiments are made at ohio station the mineral requirements of pigs has been a subject of much experimental work and some controversy for several years the ohio station makes the following brief report on some borne work done to test out the effectiveness of several substances commonly used in mineral mixtures feeding investigations with swine during the year included a test to study the effect of adding various minerals to the simple mixture of salt I 1 part limestone 2 parts and raw bone meal 2 parts this mixture and the various additional minerals were fed with a ration of corn and soy bean oil meal which is known to be deficient in minerals glaubert Glau bers salts which Is a laxative was fed at the rate of 10 pounds in III each IW 10 pounds of the mixture the salts salta did not increase the rapidity of growth but brought about a slight saving in feed for each pounds of gain produced wood charcoal to the extent of 15 per cent of the mineral mixture resulted in neither faster nor cheaper gains potassium iodide in the limited amount of 05 0 pound to every pounds of minerals proved to be beneficial efi cial it Is used as a preventive of of goiter and under some conditions seems to have a place in mineral mixtures for growing pigs copperas or iron sulphate was used os as a source of iron and fed tit at the rate of 2 pounds in ench each pounds of minerals the pigs recel ing it made 3 2 pound more gain daily a head and consumed pounds less a teed feed to fo each pounds of gain than those on the same ration without the copperas |