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Journal of Animal Science, Vol 76, Issue 1 275-286, Copyright © 1998 by American Society of Animal Science
JOURNAL ARTICLE |
F. N. Owens, D. S. Secrist, W. J. Hill and D. R. Gill
Oklahoma Agricultural Experiment Station, Animal Science Department, Stillwater 74078, USA.
Acute and chronic acidosis, conditions that follow ingestion of excessive amounts of readily fermented carbohydrate, are prominent production problems for ruminants fed diets rich in concentrate. Often occurring during adaptation to concentrate-rich diets in feedyards, chronic acidosis may continue during the feeding period. With acute acidosis, ruminal acidity and osmolality increase markedly as acids and glucose accumulate; these can damage the ruminal and intestinal wall, decrease blood pH, and cause dehydration that proves fatal. Laminitis, polioencephalomalacia, and liver abscesses often accompany acidosis. Even after animals recover from a bout of acidosis, nutrient absorption may be retarded. With chronic acidosis, feed intake typically is reduced but variable, and performance is depressed, probably due to hypertonicity of digesta. Acidosis control measures include feed additives that inhibit microbial strains that produce lactate, that stimulate activity of lactate-using bacteria or starch-engulfing ruminal protozoa, and that reduce meal size. Inoculation with microbial strains capable of preventing glucose or lactate accumulation or metabolizing lactate at a low pH should help prevent acidosis. Feeding higher amounts of dietary roughage, processing grains less thoroughly, and limiting the quantity of feed should reduce the incidence of acidosis, but these practices often depress performance and economic efficiency. Continued research concerning grain processing, dietary cation-anion balance, narrow-spectrum antibiotics, glucose or lactate utilizing microbes, and feeding management (limit or program feeding) should yield new methods for reducing the incidence of acute and chronic acidosis.
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S. Rigout, C. Hurtaud, S. Lemosquet, A. Bach, and H. Rulquin Lactational Effect of Propionic Acid and Duodenal Glucose in Cows J Dairy Sci, January 1, 2003; 86(1): 243 - 253. [Abstract] [Full Text] [PDF] |
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J. E. Nocek, W. P. Kautz, J. A. Z. Leedle, and E. Block Direct-Fed Microbial Supplementation on the Performance of Dairy Cattle During the Transition Period J Dairy Sci, January 1, 2003; 86(1): 331 - 335. [Abstract] [Full Text] [PDF] |
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J. E. Keunen, J. C. Plaizier, L. Kyriazakis, T. F. Duffield, T. M. Widowski, M. I. Lindinger, and B. W. McBride Effects of a Subacute Ruminal Acidosis Model on the Diet Selection of Dairy Cows J Dairy Sci, December 1, 2002; 85(12): 3304 - 3313. [Abstract] [Full Text] [PDF] |
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T. Mutsvangwa, J. P. Walton, J. C. Plaizier, T. F. Duffield, R. Bagg, P. Dick, G. Vessie, and B. W. McBride Effects of a Monensin Controlled-Release Capsule or Premix on Attenuation of Subacute Ruminal Acidosis in Dairy Cows J Dairy Sci, December 1, 2002; 85(12): 3454 - 3461. [Abstract] [Full Text] [PDF] |
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G. Gabel and J. R. Aschenbach Influence of food deprivation on the transport of 3-O-methyl-{alpha}-D-glucose across the isolated ruminal epithelium of sheep J Anim Sci, October 1, 2002; 80(10): 2740 - 2746. [Abstract] [Full Text] [PDF] |
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J. M. DeFrain, J. E. Shirley, E. C. Titgemeyer, A. F. Park, and R. T. Ethington Impact of Feeding a Raw Soybean Hull-Condensed Corn Steep Liquor Pellet on Induced Subacute Ruminal Acidosis in Lactating Cows J Dairy Sci, August 1, 2002; 85(8): 2000 - 2008. [Abstract] [Full Text] [PDF] |
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G. R. Ghorbani, D. P. Morgavi, K. A. Beauchemin, and J. A. Z. Leedle Effects of bacterial direct-fed microbials on ruminal fermentation, blood variables, and the microbial populations of feedlot cattle J Anim Sci, July 1, 2002; 80(7): 1977 - 1985. [Abstract] [Full Text] [PDF] |
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J. R. Aschenbach, T. Borau, and G. Gabel Glucose Uptake via SGLT-1 Is Stimulated by {beta}2-Adrenoceptors in the Ruminal Epithelium of Sheep J. Nutr., June 1, 2002; 132(6): 1254 - 1257. [Abstract] [Full Text] [PDF] |
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K. Tajima, R. I. Aminov, T. Nagamine, H. Matsui, M. Nakamura, and Y. Benno Diet-Dependent Shifts in the Bacterial Population of the Rumen Revealed with Real-Time PCR Appl. Envir. Microbiol., June 1, 2001; 67(6): 2766 - 2774. [Abstract] [Full Text] |
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J. B. Russell and J. L. Rychlik Factors That Alter Rumen Microbial Ecology Science, May 11, 2001; 292(5519): 1119 - 1122. [Abstract] [Full Text] |
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