Effects of Feeding Lactating Dairy Cows Diets Containing Extruded Soybeans and Calcium Salts of Long-chain Fatty Acids

D. J. Schauff, J. H. Clark, J. K. Drackley

Research output: Contribution to journalArticle

Abstract

Four multiparous Holstein cows averaging 36 DIM and fitted with ruminal cannulas were utilized in a 4 × 4 Latin square design to investigate the effects of feeding extruded whole soybeans and Ca salts of long-chain fatty acids. Treatments were diets containing 1) no added fat, 2) 16% extruded whole soybeans, 3) 16% extruded whole soybeans and 3% Ca salts of long-chain fatty acids, and 4) 16% extruded whole soybeans and 6% Ca salts of long-chain fatty acids. Cows were fed for ad libitum intake a diet of alfalfa haylage, corn silage, and concentrate (35:15:50, DM basis). Intakes of DM and energy and production of milk, 4% FCM, fat, CP, and SNF were decreased by feeding extruded whole soybeans and 6% Ca salts of long-chain fatty acids, but differences were small among the other treatments. The weight percentages and yields of C18:0, C18:1, and C18:2 in milk were increased, and most shorter chain fatty acids were decreased, by feeding supplemental fat. Digestibilities of DM, OM, ADF, soluble residue, total C18 fatty acids, and total fatty acids were decreased, but digestibility of hemicellulose was increased by feeding supplemental fat. The largest decrease in digestibilities of most dietary constituents and in energy and N utilization occurred when 16% extruded whole soybeans plus 6% Ca salts of long-chain fatty acids were fed to the cows. Calcium salts of long-chain fatty acids can supply up to 3% of the dietary DM in diets containing 16% extruded whole soybeans without having deleterious effects on most variables measured in this experiment.

Original languageEnglish (US)
Pages (from-to)3003-3019
Number of pages17
JournalJournal of Dairy Science
Volume75
Issue number11
DOIs
StatePublished - 1992

Keywords

  • Ca salts of long-chain fatty acids
  • Ca-LCFA
  • EWSB
  • ME
  • WSB
  • extruded whole soybeans
  • extruded whole soybeans ;calcium salts of long-chain fatty acids ;ruminal fermentation
  • metabolizable energy
  • milk composition
  • nutrient digestibilities
  • whole soybeans

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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