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Image 90 of Progress report (Kentucky Agricultural Experiment Station) n.176

Part of Kentucky Agricultural Experiment Station

-88- small increases in gains over the urea control, and no difference in level of molasses addition was observed. The reason for this small response from molasses, relative . to positive traits in other reports, is not clear. The small increases in performance due to molasses addition to urea rations agree with the increases in total nitrogen reaching the abomasum reported in the preceding article. Steers fed molasses tended to consume more feed than those fed urea alone. While preceding results suggest that ruminal protein synthesis is stimulated by additions of molasses to urea rations, the question as to whether the reported improvement in steer performance is a result of microbial stimulation or improved feed intake is yet to be answered. LEVEL OF INTAKE AND FEEDLOT PERFORMANCE OF STEERS FED SOYBEAN MEAL OR UREA C. O. Little, D. B. Laster, N. W. Bradley, and G. E. Mitchell, Jr. The preceding report has suggested that decreased feed intake may be a factor affecting feedlot performance of cattle fed urea supplements. This experiment was conducted to compare ground ear corn rations supplemented by urea and soybean meal, at equal levels of intake. Procedure Eighteen yearling steers were individually fed ground ear corn rations supple- " mented with soybean meal (SBM) or urea to contain 10. 5% crude protein for a 112-day feeding period. Six were randomly assigned to three treatments as follows; I SBM full fed; II - Urea full fed; and III - SBM intake limited to that of the urea ration. Results The results of this experiment are summarized in Table 1. Steers on a full . feed of the urea ration (I I) consumed 1. 81 lb less feed per day, gained 0. 56 lb less per day, and required 0. 95 lb more feed per lb gain than steers full fed the soybean meal supplemented ration (I). Steers receiving the soybean meal supplemented ration at a level of intake equal to that of the urea treatment (III) gained 0. 29 lb per day more and required 0.82 lb less feed per lb gain than did the ureafed steers. These results indicate that feedlot performance of the steers fed soybean meal is superior to ., performance of steers fed the urea supplement even at the same level of ration intake; however, decreased intake of the urea supplemented ration may partially account for the decreased steer performance. Table 1. Feedlot Performance of Yearling Steers Individually Fed Soy- bean Meal or Urea Supplemented Ear Corn Rations (112 days) , I II III SBM Urea SBM (Full Fed) (Full Fed) (Limit Fed) No. of steers 6 6 6 * Initial wt, lb 692 694 693 Final wt, lb 1019 959 990 Total gain, lb 327 265 297 . Av daily gain, lb 2. 92 2.36 2.65 Av daily ration intake, lb 21. 78 19. 93 20.00 Feed/gain 7.49 8.44 7.62

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