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Journal of Dairy Science Vol. 70 No. 3 592-600
© 1987 by American Dairy Science Association ®
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Effect of Mineral Salts, Carbachol, and Pilocarpine on Nutrient Digestibility and Ruminal Characteristics in Cattle1

R. D. Wiedmeier, M. J. Arambel, R. C. Lamb2 and D. P. Marcinkowski

Department Animal, Dairy, and Veterinary Sciences, Utah State University, Logan 84322-4815

ABSTRACT

Fifty percent concentrate diets containing 2% sodium bicarbonate, sodium chloride, or no additional mineral salts were fed at a rate of 86 g dry matter/kg body weight.75/d to three barren Holstein cows fitted with ruminal fistulas in a 3 x 3 Latin square design. Dietary adaptation was 14 d followed by 4 d collection. Ruminal pH, liquid volume, liquid dilution rate, and particulate rate of passage were increased with dietary mineral salts.

Six Holstein cows fitted with ruminal fistulas were administered .01 mg carbochol/kg body weight/d, .10 mg pilocarpine/kg body weight/d, or saline placebo via subcutaneous, osmotically controlled pumps in a replicated 3 x 3 Latin square design. Treatments were administered for a 14-d adaptation period followed by an 8-d collection period. Both carbachol and pilocarpine increased liquid dilution rate, particulate rate of passage, and percent cellulolytic bacteria, whereas liquid volume was reduced.

FOOTNOTES

1 Mention of a trade name does not imply an endorsement or recommendation by Utah State University or the US Department of Agriculture over similar companies or products not mentioned.

2 Agricultural Research Service, US Department of Agriculture, Logan, UT 84322-4863.






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Copyright © 1987 by the American Dairy Science Association ®.