Oskar Kelner (1851-1911) was a German agrochemist and physiologist known for his research in animal feeding. He developed a system for assessing the nutritional value of feed by their productive effect, expressed in starch equivalents. This system was first published in 1905 in his book Feeding Farm Animals. The book was published in Kiev in 1907 under the auspices of the journal "Household" and the South Russian Society for the Promotion of Agriculture and Rural Industry. It is a valuable source of knowledge for specialists in the field of agriculture, historians of agrarian science, as well as collectors of rare publications. The book is of interest to specialists in the field of agriculture, historians of agrarian science and collectors of rare publications. There are stamps of libraries
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