Influence of high air temperatures on colostrum composition of dairy cows and passive immunization of calves

acide gras acidez acidi grassi acidity air temperature albumine albumins calor calore calostro calves carbohydrate content casein caseina chaleur chemical composition colostro colostrum composition chimique composizione chimica contenido de carbohidratos contenido proteico contenuto lipidico dairy cows estate fatty acids feed intake feeding systems heat immunoglobuline immunoglobulins ingestione alimentare (animali) inmunidad pasiva inmunoglobulina lactosa lactose lattosio lipid content mortalidad mortalite mortality passive immunity ph prise alimentaire (animaux) protein content sistemi di alimentazione stress termico stress thermique summer technique d'alimentation temperatura del aire temperatura dell'aria teneur en glucides teneur en lipides ternero thermal stress vacas lecheras vacche lattifere veau verano vitelli