TABLE 2.

Summary of recommended daily iodine requirements for cat foods

Year and published source	Recommended iodine concentration
1961 41	100 μg/day kitten
1961 42	100 μg/day kitten
1962 38	100 μg/day kitten
1962 63	100 μg/day kitten; 30,000 μg/kg diet too high
1964 34	150–400 μg/day kitten; 5000 μg/day too high
1968 64	200–400 μg/kg dry diet
1972 40	100 μg/day kitten
1975 65	100–400 μg/day cat
1978 43	1400–4000 μg/kg dry diet
1986 44	1400–4000 μg/kg dry diet; 350 μg/kg dry diet kitten
1994 46	350 μg/kg dry diet minimum, all life stages
1996 49	710 μg/kg food
1999 45	350 μg/kg dry diet minimum, all life stages
2006 48	81 μg/day for 0.8 kg kitten (based on 450 μg iodine/1000 kcal ME) 87.5 μg/day for 4 kg adult (based on 350 μg iodine/1000 kcal ME)
2010 61	460 μg/kg dry diet for adult cats

ME = metabolizable energy