[Factors for the genesis of bovine subclinical mastitis].

The infection risk of the bovine mammary gland is determined by susceptibility of the cow and contamination and invasion by mastitis pathogens. Genetic (e.g. yield) and lactational physiologic (e.g. stage of lactation) factors support the genesis of subclinical mastitis. This paper considers new data on cow individual and milking related influences on defence mechanisms in the teat end tissue acting in prevention of penetration through the teat canal by mastitis pathogens.