When observed in their home cages, cats fed commercial tuna fish cat food were less active, vocalized less, and spent more time on the floor and more time eating than cats fed commercial beef cat food. There were no differences in response to human handling between the two groups. There were no differences in learning ability on a two-choice point maze or in reversal learning in the same maze between beef- and tuna-fed cats. The behavior of the groups differed in a 15-min open field test only in the number of toys contacted. Cats fed the tuna had elevated tissue levels of mercury and selenium.
l'he permissible concentration of selenium which can legally be added to dairy cattle rations has recently been increased from 0.1 to 0.3 ppm. A feeding study with lactating dairy cows was conducted in which 0.3 or O.6ppm of selenium as sodium selenite was added to their diets for 23 and 26 days, respectively. Analysis of milk and blood throughout this period showed no consistent increase in the concentration of selenium in these fluids.
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