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Effects of Additional Limestone of Various Types on Feedlot Performance of Beef Cattle Fed High Corn Diets Differing in Processing Method and Potassium Level^1,2,

University of Nebraska, Lincoln 68583-0908^3,4,

Abstract

Two experiments using individually fed steers (60/experiment) and three experiments using group-fed steers (36 pens) were conducted. Diets contained approximately 80 to 85% dry [whole and(or) rolled] or high moisture corn on a dry matter basis. In one experiment with steers group-fed high moisture corn-based diets, steers fed 1.7% limestone were more efficient (P = .02) than those fed .8% limestone. Probability values fo Coarse vs Fine limestone were .11 and .18 for gain and feed conversion (F/G). In four other experiments, there were no significant differences in performance of steers fed approximately .8 or 1.7% limestone. However, in one trial, increasing the limestone level from .8 to 1.7% reduced (P = .03) fecal starch (percentage of fecal dry matter) and increased (P<.01) fecal pH. Diets containing 2.8% limestone reduced intake (P = .06) and gain (P = .15) compared with diets containing .9 or 1.9% limestone. No significant interactions occurred between limestone level (.6 vs 1.5%) and processing method (whole, rolled or mixtures of whole and rolled) of dry corn, K level (.55 vs 1.0%), or sources of limestone with similar particle size distribution and reactivity. When all experiments were combined, probabilities of a greater F statistic for .8 vs 1.7% limestone were .70, .32 and .17 for gain, dry matter intake and F/G, respectively. Least-squares means for F/G were 6.01 (.8% limestone) and 5.72 (1.7% limestone) ± .10.

¹ The authors gratefully acknowledge Calcium Carbonate Co., Quincy, IL; Iowa Limestone Co., Des Moines, IA and Kerford Limestone Co., Lincoln, NE for supplying limestone and Feed Commodities Co., Fremont, Nebraska for providing liquid supplements.

² Mention of specific products or equipment does not constitute a guarantee or endorsement by Univ. of Nebraska and does not imply its approval to the exclusion of other products that may be suitable.

³ Published with the approval of the Director as Paper No. 7105, Journal Ser., Nebraska Agr. Exp. Sta.

⁴ Dept. of Anim. Sci.

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