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Comparison of Silages Made from Field Corn (Ohio M15) and Silage Corn (Eureka) for Milk Production¹

Departments of Dairy and Agricultural Chemistry, Michigan State University, East Lansing

ABSTRACT

Previous papers (6, 7) have shown that the total digestible nutrients (TDN) in corn silage are superior for milk production to those found in hay. Since the chemical nature of the compound(s) which increases the net energy value of some feeds is unknown, it has been referred to as the unidentified lactation factor(s). Dunn et al. (2) recently demonstrated that the corn grain present in corn silage increased the milk-producing value of the silage. This factor was also present in corn-ear silage (3).

The nutritive value of immature corn silages, however, has not been determined except in rations that already contained ample amounts of grain. The early literature dealing with the relative value of corn harvested at different stages of maturity was reviewed by Nevens (10). Nevens pointed out that the conclusions reached by the early investigators concerning the suitability of a particular variety of corn for silage apparently were based on (a) yields of fresh matter or (b) yields of dry matter.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1833.