title: Duodenal rapeseed oil infusion in early and midlactation cows. 1. Intestinal apparent digestibility of fatty acids and lipids.
abstract: Rapeseed oil was infused continuously into the duodenum of lactating dairy cows. Five separate trials were conducted with differences in amount of oil infused (1.0 to 1.5 kg/d), in lactation stage (early to late), and in basal diet (corn or grass silages). The effects of lecithin addition (9 g/d) also were studied. Oil infusion did not affect the apparent digestibility of defatted organic matter. Fatty acid, ether extract, and total lipid digestibilities in control cows were 62 to 82%, 72 to 76%, and 59 to 73%, respectively. Intestinal apparent digestibilities of oil fatty acid and ether extract fractions were estimated to be 63 to 74% and 67 to 81%, respectively. Intestinal apparent digestibility of oil total lipids was only 20 to 57% due to a significant increase in nonfatty acid lipid excretion (160 to 750 g/d above control cows), which sharply decreased the energy value of the infused oil. Lecithin did not modify apparent digestibility in oil-infused cows.
authors.affiliation: Laboratoire de la Lactation, Institut National de la Recherche Agronomique, Saint Genès Champanelle, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Chilliard
authors.forename: D
authors.initials: D
authors.lastname: Bauchart
authors.forename: G
authors.initials: G
authors.lastname: Gagliostro
authors.forename: A
authors.initials: A
authors.lastname: Ollier
authors.forename: M
authors.initials: M
authors.lastname: Vermorel
mesh_terms: D000818:Animals; D001937:Brassica; D002417:Cattle / Q000378:metabolism*; D004063:Digestion; D005227:Fatty Acids / Q000378:metabolism; D005229:Fatty Acids, Monounsaturated; D005243:Feces / Q000737:chemistry; D005260:Female; D007413:Intestinal Mucosa / Q000378:metabolism*; D007774:Lactation / Q000378:metabolism*; D050356:Lipid Metabolism; D010938:Plant Oils / Q000378:metabolism*; D000074262:Rapeseed Oil; D012044:Regression Analysis
chemical_list: D005227:Fatty Acids; D005229:Fatty Acids, Monounsaturated; D010938:Plant Oils; D000074262:Rapeseed Oil