1. This provided an economic incentive for the iodine supplementation of dairy herds, which was achieved by providing iodized salt licks for cattle (introduced by Boots in 1928) and subsequently the use of iodine enriched cattle feed (marketed by Spillers in 1937). The result was a spectacular rise in the iodine content of milk, particularly during the winter months when pasture is in short supply and cattle are dependent on iodine rich artificial feed. The use of iodinated casein, given to cows as a lactation promoter, and iodophor disinfectants, used for cleaning teats and bulk milk tankers, also contributed to the iodine contamination of milk.'3
2. Treatise on English bronchocoele, with a few remarks on the use of iodine and its compounds;Inglis, J.,1838
3. Prevalence and geographical distribution of endemic goitre. In: Endemic goitre. WHO. Monograph Series No 44;Kelly, F.C.; Snedden, W.W.,1960
4. Endemic cretinism;Pharoah, P.O.D.; Delange, F.; Fierro-Benitez, R.; Stanbury, J.B.,1980
5. Goitre in the English school child;Stocks, P.;Quart J Med