Method for production of milk with a high content of native vitamin D

A method for the production of milk with a high native vitamin D3 content, said method comprising providing a roofed enclosure including at least one luminaire comprising one lamp that is a full spectrum fluorescent lamp which emits VIS radiation, UV-A radiation and UV-B radiation, exposing at least one lactating animal to the full spectrum including the VIS, UV-A and UV-B radiation for between 6 and 22 hours daily such that a milk yield per lactating animal is increased and milking the animal, wherein a UV-B radiation component in an emission spectrum of the lamp is between at least 0.2% of an irradiation intensity of the lamp and less than 5% of the irradiation intensity of the lamp and wherein a radiation component in a VIS range in the emission spectrum of the lamp is at least 70%, wherein the at least one luminaire includes a lamp cover comprised of quartz glass, borosilicate glass, polymethyl methacrylate, polymethylpentene, fluorinated ethylene propylene, or polytetrafluoroethylene, said lamp cover being permeable to UV-B radiation having a wavelength of 300 nm, wherein the lamp cover is fixed to a housing of the luminaire, and a seal with talcum is arranged between the lamp cover and the housing.