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Effects of Citrus Pulp in High Urea Rations for Steers¹

University of Florida, Gainesville 32611

ABSTRACT

Effects of pelleted and conventional citrus pulp as a replacement for corn, with soybean meal added to keep protein comparable, were tested in rations with 5% urea and 33.33% sugarcane bagasse for fistulated steers. Thus, all rations were low in readily fermented carbohydrates other than those of corn or citrus pulp. Evaluation criteria were concentrations of urea in blood and of pH, ammonia, and volatile fatty acids of rumen fluid. Citrus pulp for diets 1, 2, 3, and 4 was 0, 19, 38, or 55%. Rumen fluid and blood were sampled 1 h before and 2, 4, 7, and 12 h after feed was placed directly into the rumen. No differences between pelleted and conventional pulp or among time trends were significant except that for both forms rumen ammonia was lower with the two highest percents of citrus pulp. Addition of citrus pulp at 0, 19, 38, or 55% of the ration reduced rumen pH (6.85, 6.65, 6.61, 6.51). Blood urea and rumen ammonia decreased in steers fed 19, 38, or 55% pulp; thus, the acetic to propionic ratio was higher. Butyric acid changed only in the time trend. Total volatile fatty acid concentrations were higher at 19, 38, and 55% than at 0% pulp. They were higher at 38 and 55 than at 19%.

¹ Florida Agricultural Experiment Station Journal Series No. 6079.

² Avisna, Apartado 37, Barcelona, Venezuela.