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Departments of Dairy and Agricultural Chemistry, Michigan State College, East Lansing
ABSTRACT
In a previous publication, Huffman and Duncan (1) showed that corn silage was superior to hay for milk production on a total digestible nutrient (TDN) basis. The superiority of the TDN in the corn silage was attributed to the presence of an unidentified lactation factor(s) in the corn which is needed to balance the hay for efficient milk production (2, 3, 4). The cows were maintained on an all-hay ration until they dropped markedly in milk production and then part of the hay was replaced with either grain or corn silage on an equal TDN basis. This depletion method makes it possible to test for the presence of the unidentified milk-stimulating factor(s) found in grains and some hays.
The results of the work with corn silage (1) suggested the possibility that the corn in corn silage may be just as valuable as the corn grain harvested from the field, stored in bins, ground into a meal, and then fed in the manger.
1 Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal article No. 1659.
3 Present address: Dairy Husbandry Research Branch, USDA, Beltsville, Md.
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