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Effects of Multiple Feeding upon Performance of Guernsey Heifers Fed Urea-Treated Corn Silage¹

Department of Dairy Husbandry, University of Missouri, Columbia

ABSTRACT

The effects of feeding grain and urea-corn silage (0.5% urea) two and four times daily were studied in a 74-day trial utilizing 40 Guernsey heifers in a 2 x 2 factorial design. Urea-corn silage fed 4x daily resulted in a nonsignificant (at P < .05) 18.4% greater gain than 2x daily feeding. No significant effect (at P < .05) on growth was observed for 2x vs. 4x daily feeding of both grain and urea-treated corn silage. However, feeding urea-treated corn silage 4x daily resulted in a significant (at P < .05) 13.7% decrease in estimated kg of TDN required per kg of weight gain when compared to 2x daily feeding. When grain was fed 2x and 4x and silage 2x daily, 14.4% less TDN was required per kg of gain in the group receiving grain 4x than among those fed grain 2x daily. Blood urea nitrogen and rumen volatile fatty acids (VFA) were not significantly affected by treatments. However, their trends favored more frequent feeding of silage.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series no. 5213. Approved by the Director.