title: Influence of canola fat on yield, fat percentage, fatty acid profile, and nitrogen fractions in Holstein milk.
abstract: Effects of canola fat on feed intake, yield, and composition of milk of early lactation dairy cows were investigated. Concentrate mixtures containing 0, 2.5, 5.0, 7.3, and 9.6% added fat as Jet-Sploded whole canola seed (0, 4.5, 9.0, 13.2, and 17.4% of DM, respectively) were fed to 15 cows in diets containing 60% concentrate and 40% forage (DM basis). Diets contained 16.5% CP, 30% alfalfa silage, and 10% whole crop oat silage (DM basis). There was a trend for a cubic effect on DMI, a quadratic effect on milk yield, and a small, but significant, linear decrease in milk protein percentage with increasing level of canola seed; the decrease was primarily in the casein fraction. Although milk fat percentage was not altered, addition of Jet-Sploded canola seed caused a substantial reduction in some short- and medium-chain fatty acids and a concomitant increase of as much as 65% in the concentration of C18:1. Results suggest that canola fat from Jet-Sploded whole canola seed can be included up to 5% of dietary DM without negative effects on DMI and with a net positive effect on milk yield.
authors.affiliation: Department of Animal Science, University of Alberta, Edmonton, Canada.
authors.forename: G R
authors.initials: GR
authors.lastname: Khorasani
authors.forename: P H
authors.initials: PH
authors.lastname: Robinson
authors.forename: G
authors.initials: G
authors.lastname: De Boer
authors.forename: J J
authors.initials: JJ
authors.lastname: Kennelly
mesh_terms: D000818:Animals; D001937:Brassica; D002417:Cattle / Q000378:metabolism*; D004041:Dietary Fats / Q000378:metabolism*; D004435:Eating; D005227:Fatty Acids / Q000032:analysis; D005260:Female; D007774:Lactation / Q000378:metabolism*; D008055:Lipids / Q000032:analysis; D008892:Milk / Q000737:chemistry / Q000378:metabolism*; D008894:Milk Proteins / Q000032:analysis
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D008055:Lipids; D008894:Milk Proteins