Ingestion of iron in sow''s faeces by piglets reared in farrowing crates with slotted floors

1. A spectrophotometric assay using rho-iodo-nitro-triphenyl tetrazolium chloride as the indicator was developed for splenic tissue in the goldfish Carassius auratus. 2. This technique permits a rapid test for the activities of the enzymes lactic dehydrogenase, malic dehydrogenase, and alpha-glycerophosphate dehydrogenase which are indicative of the relative activities of various metabolic pathways.