title: Supplementation with bypass fat in silvopastoral systems diminishes the ratio of milk saturated/unsaturated fatty acids.
abstract: This study was conducted to evaluate if supplementing bypass fat to cows under silvopastoral systems, increases the concentration of unsaturated fatty acids in milk, thus improving the saturated/ unsaturated ratio without a negative effect on total milk yield in fat or protein. Two concentrations of two different sources of bypass fat were evaluated for 40 days, each in a group of 24 multiparous Lucerna (Colombian breed) cows. A cross-over design of 8 Latin squares 3 x 3 was used. The variables submitted to analysis were body condition, daily milk production and milk composition. Body condition, milk yield and milk quality were not different but there was a significant decrease in the amount of saturated fatty acid in both experiments while the unsaturated fat increased significantly in experiment 1 and remained stable in experiment 2. Results, such as these have as far as we know, not been reported previously and they provide an approach for the improvement of milk as a "functional food".
authors.affiliation: Grupo de investigación en Ciencias Agrarias (Grica), Facultad de Ciencias Agrarias, Universidad de Antioquia, Medellín, Colombia.
authors.forename: L
authors.initials: L
authors.lastname: Mahecha
authors.forename: J
authors.initials: J
authors.lastname: Angulo
authors.forename: B
authors.initials: B
authors.lastname: Salazar
authors.forename: M
authors.initials: M
authors.lastname: Cerón
authors.forename: J
authors.initials: J
authors.lastname: Gallo
authors.forename: C H
authors.initials: CH
authors.lastname: Molina
authors.forename: E J
authors.initials: EJ
authors.lastname: Molina
authors.forename: J F
authors.initials: JF
authors.lastname: Suárez
authors.forename: J J
authors.initials: JJ
authors.lastname: Lopera
authors.forename: M
authors.initials: M
authors.lastname: Olivera
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle / Q000378:metabolism / Q000502:physiology*; D018592:Cross-Over Studies; D004041:Dietary Fats / Q000008:administration & dosage*; D019587:Dietary Supplements; D004305:Dose-Response Relationship, Drug; D005227:Fatty Acids / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis*; D005260:Female; D007774:Lactation / Q000378:metabolism*; D008892:Milk / Q000737:chemistry*; D008894:Milk Proteins / Q000032:analysis*; D011897:Random Allocation
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D008894:Milk Proteins