The influence of nutrient intake on the immune defence of the dairy cow with emphasis on the periparturient period

alimentation des animaux animal feeding animal nutrition blood serum carence en vitamine dairy cows deficiencia de vitaminas enfermedades infecciosas immunodeficiency immunologie immunology infectious diseases ingestion de substances nutritives inmunodeficiencia leucocitos leucocyte leukocytes maladie infectieuse mammite mastitis nutrient intake nutrition animale oligoelementos perinatal period suecia sweden trace elements vacas lecheras vitamin deficiencies