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Comparison of Feeding Corn Silages from Leafy or Conventional Corn Hybrids to Lactating Dairy Cows¹

T. D. Nennich^*,2, J. G. Linn^*, D. G. Johnson, M. I. Endres^* and H. G. Jung^*,

^* Department of Animal Science, University of Minnesota, St. Paul, MN 55108
West Central Research and Outreach Center, University of Minnesota, Morris, MN 56267
USDA-Agriculture Research Service, St. Paul, MN 55108

Corresponding author: J. G. Linn; e-mail: linnx002{at}umn.edu.

Three corn hybrids (Pioneer 36F30, Mycogen TMF2450, and Mycogen TMF2404) were compared for yield and quality traits, and lactation performance and apparent digestibility by Holstein cows. The three corn silages were harvested at a target of 33 to 35% dry matter. Before harvest, six corn plants were randomly selected for plant fractionation. Grain-to-stover ratios were 0.92, 0.70, and 0.95 for the 36F30, TMF2450, and TMF2404 corn plants, respectively. Fifty-two multiparous Holstein cows were placed on a 120-d lactation trial after a 21-d covariate diet. Cows were blocked by calving date and randomly assigned within block to one of three dietary treatments, containing approximately 40% (dry matter basis) corn silage. Milk yield, milk components, and dry matter intake did not differ among dietary treatments. In vitro true and neutral detergent fiber digestibilities were numerically higher for TMF2404 than the other corn silage hybrids. Apparent total-tract crude protein and neutral detergent fiber digestibilities, as measured by acid insoluble ash, were higher for TMF2450 than the other two hybrids, but starch digestibility was not different between the corn silage dietary treatments. Although small differences in nutrient content and digestibility existed among corn silage hybrids, inclusion of these leafy hybrids in lactating cow diets at 40% of the dietary dry matter did not have a significant impact on lactation performance of dairy cattle.

Key Words: corn silage hybrid • dairy cow • nutrient digestibility

Abbreviation key: COV = covariate corn silage, EE = ether extract, IVTD = in vitro true digestibility, IVNDFD = in vitro NDF digestibility, NDICP = neutral detergent insoluble CP

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