title: Changes in penetrability of bovine papillary duct to endotoxin after milking.
abstract: The relative penetrability of bovine papillary ducts was assayed using frequency of inflammatory response to implantation of Escherichia coli endotoxin at a depth of 3 mm. Penetrability immediately after machine milking, compared with penetrability after delays of 10 to 480 minutes, indicated a decrease in frequency of penetrability to a minimum at 2 hours after milking, a decrease of about 75%. Four and 8 hours after milking, frequency of penetrability increased to about 55% of that measured immediately after milking.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D003612:Dairying / Q000295:instrumentation; D004731:Endotoxins / Q000633:toxicity*; D004926:Escherichia coli; D005260:Female; D008321:Mammary Glands, Animal / Q000502:physiology*; D008414:Mastitis, Bovine / Q000209:etiology*
chemical_list: D004731:Endotoxins