J. Anim Sci.
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J. Anim Sci. 1987. 65:303-308.
© 1987 American Society of Animal Science
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Trona and Sodium Bicarbonate in Beef Cattle Diets: Effects on Site and Extent of Digestion1

B. J. Boerner2, F. M. Byers3, G. T. Schelling3, C. E. Coppock3 and L. W. Greene3

Texas A&M University, College Station 77843

Abstract

Six yearling Hereford x Angus steers (avg 272 kg), each with ruminal, duodenal and ileal cannulas were used in a 6 x 6 Latin-square metabolism trial to evaluate the impact of NaHCO3 and trona (a ground, nonrefined ore with chemical composition NaHCO3-Na2CO3-2H2O) on site and extent of digestion of nutrients in the digestive tract. The diets were 50:50 or 90:10 (cracked corn-based concentrate:cottonseed hulls) with no buffer, 1% NaHCO3, or 1% trona. Intake, across all treatments, averaged 2.4% of body weight. Dry matter (DM) and starch digestibility (via indigestible acid detergent fiber) before the duodenum was decreased (P<.10) with trona in the 50:50 diet. Digestibility of DM, crude protein and starch before the ileum were greater (P<.05) in the 90:10 diet vs 50:50 diet. Total tract digestibility was similar across buffer treatments in the 90:10 diet. Addition of NaHCO3 increased (P<.05) digestibility of dry matter and cell solubles in the 50:50 diet. Organic matter and crude protein digestibility were also increased (P<.10) with NaHCO3. Apparent crude protein and cell solubles digestibility were greater (P<.10) with trona than NaHCO3 in the 50:50 diet. This trial indicates that buffers provide overall enhancement of diet digestibility in mixed grain/roughage diets.

Footnotes

1 Texas Agri.Exp.Sta.journal article no. TA-21342. This study was supported in part by Tenneco Minerals co., Houston,TX 77068.

2 Present address: Texas Grain and Feed Assoc., Fort Worth, TX 76102.

3 Dept. of Anim. Sci.






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Copyright © 1987 by the American Society of Animal Science.