Selenium, vitamin E, vitamin A and beta-carotene status of cattle in Finland, with special reference to epidemiological udder health and reproduction data

aliment pour animaux animal diseases animal health animal nutrition bovin laitier cows dairy cattle enfermedades de los animales epidemiologia epidemiologie epidemiology estado nutricional feeds fertilidad fertilite fertility finland finlande finlandia ganado de leche glande mammaire hatos herds maladie des animaux mammary glands nutrition animale nutritional status oligoelementos piensos reproduction retinol sanidad animal selenio selenium trace elements troupeau vaca vache vitamin e vitamina e vitamine e