title: Selenium content and distribution in cow's milk supplemented with two dietary selenium sources.
abstract: The effect of two sources of Se, selenized yeast (Se-Y) and sodium selenite, added to total mixed rations (TMR) fed to cows on Se milk content and distribution in milk components was studied on three farms for 6 weeks. The maximal increase in milk Se was attained with Se-Y supplemented at 0.3 microg g(-1). The effect was immediate, with an increase of 9 microg L(-1) being observed after only 5 days, and remained steady until the last sample at day 40 of Se supplementation. Se distribution in milk components was constant, 53.6, 42.6, and 9.3% in whey, casein, and fat, respectively, and was unaffected by the form of supplementation. The effect of the level of Se-Y supplementation on milk Se was studied on two farms. Increasing dietary Se-Y from 0 to 0.5 microg g(-1) elevated milk Se content from 20 to 39 microg L(-1). Se-enriched cow's milk at different levels can be produced by varying dietary Se supplementation in the form of selenized yeast.
authors.affiliation: Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, University of Santiago de Compostela, Avenida de las Ciencias s/n, E-15782 Santiago de Compostela, Spain.
authors.forename: Oscar
authors.initials: O
authors.lastname: Muñiz-Naveiro
authors.forename: Raquel
authors.initials: R
authors.lastname: Domínguez-González
authors.forename: Adela
authors.initials: A
authors.lastname: Bermejo-Barrera
authors.forename: José A
authors.initials: JA
authors.lastname: Cocho de Juan
authors.forename: José M
authors.initials: JM
authors.lastname: Fraga Bermúdez
authors.forename: Alfonso
authors.initials: A
authors.lastname: Goris Pereiras
authors.forename: Antonio
authors.initials: A
authors.lastname: López Santamariña
authors.forename: Ismael
authors.initials: I
authors.lastname: Martínez Lede
authors.forename: Javier
authors.initials: J
authors.lastname: Valledor Puente
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández-Couto Gómez
authors.forename: Pilar
authors.initials: P
authors.lastname: Bermejo-Barrera
mesh_terms: D000818:Animals; D002417:Cattle; D004032:Diet; D019587:Dietary Supplements; D005260:Female; D008892:Milk / Q000737:chemistry*; D012441:Saccharomyces cerevisiae; D012643:Selenium / Q000008:administration & dosage* / Q000032:analysis*; D012645:Selenomethionine / Q000032:analysis
chemical_list: D012645:Selenomethionine; D012643:Selenium