| Summary: | An attempt is made to correlate the world literature on mineral nutrition in farm animals, with existing data from Latin America. The most comprebensive map of deficient aveas can be made in the case of lodine, utilizing some of the data from buman goiter belts.
From forage analysis as well as empirical knowledge and personal reports, it bas been possible to try to define the phosphorus deficient areas which are very extensive in Latin America, specially in areas of natural grasslands
A copper deficient area is likely to extend over a wide area of the Peruvian Andes, but its limits are very hard to define at present Cobalt is definitely deficient in Central Brasil, but again the limits of this area are in doubt
A very bigh inon content is reported from forages of Uruguay and Paraguay, and it is possible that all these areas may also be deficient in phosphorus. Selenium toxicity bas been reported only from central Mexico, in areas where old slag from silver mining, bave spread over agricultural land.
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