Advancements in Ruminant Trace Mineral Nutrition
نویسنده
چکیده
Major advances in the field of trace mineral nutrition occurred in the twenty century. All of the trace minerals recognized as being important in ruminant nutrition were first shown to be essential in the 1900's with the exception of iron. Between 1920 and 1960 naturally occurring deficiencies of iodine, copper, cobalt, manganese, selenium, and zinc were first reported in cattle. Today it is common to supplement a number of trace minerals to ruminant diets to ensure that requirements are met. However, recommendations from textbooks and extension publications from the early to mid 1900's suggests that minimal supplementation of trace minerals occurred during this time. In the 20th edition of Feeds and Feeding published in 1936, Dr. F. B. Morrison stated "In addition to Ca, P, and common salt, iodine and also iron and copper must sometimes be considered in the feeding of dairy cattle. Sufficient amounts of the other essential minerals are supplied by any ordinary ration, as far as is known". Dr. Morrison stated in his 1956 edition of Feeds and Feeding "Except in the areas where there is a deficiency of one of the trace minerals iodine, cobalt, copper, iron, or manganese there is no benefit from feeding a trace mineral supplement, or in using trace mineralized salt instead of common salt.
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