Effects of Chain Length and Unsaturation of Fatty Acid Mixtures Infused into the Abomasum of Lactating Dairy Cows

D. R. Bremmer, L. D. Ruppert, J. H. Clark, J. K. Drackley

Research output: Contribution to journalArticle

Abstract

Six cows were utilized in a 6 × 6 Latin square design with 21-d periods to determine effects of the postruminal profile of fatty acids on dry matter (DM) intake, milk yield and composition, nutrient digestibilities, and plasma metabolites. Treatments were abomasal infusions of 1) control [168 g/d of meat solubles (carrier for fatty acids) plus 10.6 g/d of Tween 80® (emulsifier)], 2) control plus 450 g/d of mostly saturated fatty acids, 3) control plus 450 g/d of palm oil fatty acids low in linoleic acid, 4) control plus 450 g/d of palm oil fatty acids, 5) control plus 450 g/d of soybean oil fatty acids, and 6) control plus 450 g/d of soybean oil fatty acids high in palmitic acid. Treatments 2, 3, 4, and 6 contained similar ratios of C16 to C18 fatty acids. Infusion of soybean oil fatty acids or soybean oil fatty acids high in palmitic acid decreased intakes of DM, organic matter, crude protein, acid detergent fiber, neutral detergent fiber, gross energy, and total fatty acids and tended to decrease yields of milk and fat-corrected milk compared with the infusion of mostly saturated fatty acids. Infusion of palm oil fatty acids low in linoleic acid or palm oil fatty acids decreased milk fat percentage compared with other treatments. Ruminal characteristics and apparent digestibilities of DM, organic matter, crude protein, acid detergent fiber, neutral detergent fiber, energy, total fatty acids, and total C18 fatty acids were not different. Infusion of fatty acids increased concentrations of cholesterol in plasma. The amount of unsaturated fatty acids passing into the small intestine may influence responses of dairy cows to supplemental fat.

Original languageEnglish (US)
Pages (from-to)176-188
Number of pages13
JournalJournal of Dairy Science
Volume81
Issue number1
DOIs
StatePublished - Jan 1998

Keywords

  • Dairy cows
  • Dry matter intake
  • Fatty acids
  • Linoleic acid

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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