title: Dietary fatty acid intervention of lactating cows simultaneously affects lipid profiles of meat and milk.
abstract: BACKGROUND
  The present study investigated tissue-specific responses of muscle and mammary gland to a 10 week intervention of German Holstein cows (n = 18) with three different dietary fat supplements (saturated fat; linseed oil or sunflower oil plus docosahexaenoic acid-rich algae) by analysing fatty acid profiles and quality parameters of meat and milk.
  
  
  RESULTS
  Plant oil/algae intervention affected neither fat content nor quality parameters of meat but decreased fat content and saturated fatty acid amounts of milk. Linseed oil/algae intervention caused significantly higher concentrations of C18:3n-3 (meat, 1.0 g per 100 g; milk, 1.2 g per 100 g) and C22:6n-3 (meat, 0.3 g per 100 g; milk, 0.14 g per 100 g). Sunflower oil/algae intervention increased n-6 fatty acid contents in milk (4.0 g per 100 g) but not in meat. Elevated amounts of C18:1trans isomers and C18:1trans-11 were found in meat and especially in milk of plant oil/algae-fed cows. C18:1cis-9 amounts were found to be increased in milk but decreased in meat after plant oil/algae intervention.
  
  
  CONCLUSIONS
  The present study demonstrated that dietary fatty acid manipulation substantially shifted the fatty acid profiles of milk and to a lesser extent of meat, whereas meat quality traits were not affected. Indications of tissue-specific responses of mammary gland and muscle were identified.
authors.affiliation: Group Biogenesis, Faculty of Agricultural Science, University of Antioquia, AA 1226 Medellin, Colombia.
authors.forename: Joaquin
authors.initials: J
authors.lastname: Angulo
authors.forename: Beate
authors.initials: B
authors.lastname: Hiller
authors.forename: Martha
authors.initials: M
authors.lastname: Olivera
authors.forename: Liliana
authors.initials: L
authors.lastname: Mahecha
authors.forename: Dirk
authors.initials: D
authors.lastname: Dannenberger
authors.forename: Gerd
authors.initials: G
authors.lastname: Nuernberg
authors.forename: Bernd
authors.initials: B
authors.lastname: Losand
authors.forename: Karin
authors.initials: K
authors.lastname: Nuernberg
mesh_terms: D000818:Animals; D002417:Cattle; D004041:Dietary Fats / Q000008:administration & dosage*; D004281:Docosahexaenoic Acids / Q000008:administration & dosage; D005227:Fatty Acids / Q000008:administration & dosage*; D005260:Female; D007774:Lactation; D008043:Linseed Oil; D008055:Lipids / Q000032:analysis*; D008321:Mammary Glands, Animal / Q000502:physiology; D008460:Meat / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D009132:Muscles / Q000502:physiology; D010938:Plant Oils; D000074242:Sunflower Oil
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D008055:Lipids; D010938:Plant Oils; D000074242:Sunflower Oil; D004281:Docosahexaenoic Acids; D008043:Linseed Oil