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Digestibility of Chopped oat Silage Preserved with Zinc Bacitracin Fed to Cattle and Sheep¹

Department of Animal Science, University of Florida, Gainesville

ABSTRACT

Chopped oat silage preserved with Silotracin (zinc bacitracin) was compared to a control oat silage without a preservative in a conventional total collection type digestion trial using both cattle and sheep. The percentage dry matter, protein, nitrogen-free extract, and ash content were higher in the Silotracin-treated silage than in the control silage, whereas the percentage of ether extract, crude fiber, and calories of gross energy content was lower. The Silotracin-treated oat silage contained 12% more crude protein and 11% less crude fiber than the untreated silage. Protein digestibility was significantly greater (P < 0.01) for the Silotracin-treated oat silage than for the control. Although there were no other statistically significant treatment differences in digestibility, there were increases in all digestion coefficients for the Silotracin-treated oat silage.

¹ Florida Agricultural Experiment Station, Journal Series, No. 1334. Project supported in part and zinc bacitracin furnished as Silotracin by Commercial Solvents Corporation, Terre Haute, Indiana.

² Research Assistant; Assistant Animal Husbandman, present address: Iowa State University, Ames, Iowa; Associate Animal Husbandman; Assistant Animal Husbandman and Animal Nutritionist.