title: Direct trauma of the mammary glands in dairy cattle. I. Variations in incidence due to animal variables.
mesh_terms: D000818:Animals; D001699:Biometry; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000209:etiology; D003612:Dairying; D005260:Female; D007743:Labor, Obstetric; D007774:Lactation; D008321:Mammary Glands, Animal / Q000033:anatomy & histology / Q000293:injuries*; D011247:Pregnancy; D011270:Pregnancy, Animal; D012447:Sacrum / Q000033:anatomy & histology