Effects of duodenal infusions of palmitic, stearic, or oleic acids on milk composition and physical properties of butter.
Four dairy cows fitted with a duodenal cannula were used in a 4 x 4 Latin square design to investigate the effects of daily duodenal infusion of 500 g of fatty acids (containing mainly C16:0, C18:0, or cis-C18:1) on fecal concentrations of fatty acids, fatty acid profiles of milk fat, and solid fat content of butter. Fecal concentrations of C16:0 and especially of C18:0 were increased by duodenal infusion. Infusion with C16:0 increased the proportion of C16:0 in milk fat and delayed softening of butter when the temperature rose. Infusion with C18:0 resulted only in a slight increase of C18:0 proportion in milk fat and did not significantly affect solid fat in butter between -10 and 30 degrees C. With the infusion of cis-C18:1, the proportion of cis-C18:1 in milk fat was more than twice that of control, to the detriment of C16:0. Butter contained low proportion of solid fat, even at low temperatures. Increasing C16:0 or cis-C18:1 in milk fatty acid via duodenal infusion can be used to study their specific effects on butter characteristics, but, because of a low transfer from infusion to milk, this method is less efficient with C18:0.
Enjalbert
F
F
Ecole Nationale Vétérinaire, Département Elevage & Produits, Toulouse, France. f.enjalbert@envt.fr
Nicot
M C
MC
Bayourthe
C
C
Moncoulon
R
R
D000818:Animals; D002079:Butter / Q000032:analysis*; D002417:Cattle; D004063:Digestion; D004386:Duodenum; D005227:Fatty Acids / Q000032:analysis; D005243:Feces / Q000737:chemistry; D005260:Female; D006358:Hot Temperature; D008055:Lipids / Q000032:analysis; D008892:Milk / Q000737:chemistry*; D019301:Oleic Acid / Q000008:administration & dosage* / Q000032:analysis; D019308:Palmitic Acid / Q000008:administration & dosage* / Q000032:analysis; D013229:Stearic Acids / Q000008:administration & dosage* / Q000032:analysis
D005227:Fatty Acids; D008055:Lipids; D013229:Stearic Acids; D019301:Oleic Acid; D019308:Palmitic Acid; C031183:stearic acid; D002079:Butter