Hay standard
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![Albrect Thaer (1972-1828) German Scientist Albrect Thaer (1972-1828) German Scientist](http://14.139.56.154:82/file.php/129/lesson_9/Albrecht_Thaer_1752-1828_German_Scientist.jpg)
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In 1810 German scientist Thaer, suggested that different feeds should be compared using meadow hay as a unit.
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He published the " HAY EQUIVALENT" as measure of relative value based on determining the materials in feeds extractable with water (and other solvents).
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This standard provided that 100 lbs. of meadow hay was equal in nutritive value to 91 lbs. of clover hay or 200 lbs. of potatoes, 625 lbs. of mangels.
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Nothing was known of the chemical value of these feeds and the physiological requirements of the animals.
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The only measure was the practical feeding experience.
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Last modified: Sunday, 13 November 2011, 4:02 AM