HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Palmquist, D. L. Articles by Joyner, A. E. Search for Related Content PubMed PubMed Citation Articles by Palmquist, D. L. Articles by Joyner, A. E., Jr.

Effect of Dietary Fat and Calcium Source on Insoluble Soap Formation in the Rumen¹

Department of Dairy Science, The Ohio Agricultural Research and Development Center, Wooster 44691

ABSTRACT

Diets with and without added fat and with different amounts of soluble and insoluble calcium were fed to rumen-cannulated cows to determine roles of fat and calcium in formation of insoluble calcium soaps in the rumen.

Percent of total fatty acids in soap was increased only by addition of soluble calcium (Ca.Cl₂). The amount of fatty acid in soap was highly dependent on amount of fat in the rumen and was not changed by calcium addition. Concentration of ionized calcium in rumen content was halved by fat addition and was inversely correlated with rumen pH, whereas proportion of fatty acid in soap was directly related to pH. Rumen pH was lower 8 to 12 h postfeeding when calcium was added to the diet, which was related nonsignificantly with total volatile fatty acid concentration. Addition of fat to diets tended to lower the ratio of acetic to propionic acids in the rumen; this trend was reversed by calcium addition. Beneficial effects of added calcium in high fat diets were not caused by increased calcium soap formation in the rumen.

¹ Journal Article Number 186–85. Salaries and research support provided by state and federal funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University, and in part by Church and Dwight Company, Inc., Piscataway, NJ, and Svenska Lantmännens Riksförbund, Stockholm, Sweden.

² The Ohio Agricultural Research and Development Center.

³ Agricultural Technical Institute, The Ohio State University, Wooster 44691. Present address: Department of Animal Science, Clemson University, Clemson, SC 29631.

⁴ Deceased.