title: Enzyme-linked immunosorbent assays of bovine lactoferrin and a 39-kilodalton protein found in mammary secretions during involution.
abstract: Enzyme-linked immunosorbent assays were developed for two proteins found in mammary secretions during the non-lactating period: lactoferrin and a 39-kdal protein. Minimum detectable concentrations were .12 ng/ml for lactoferrin and .0037 ng/ml for the 39-kdal protein. Standard curves were linear in the ranges of .4 to 100 ng/ml for lactoferrin and 2.4 to 30 ng/ml for the 39-kdal protein. The immunoassays were used to measure concentrations of the proteins in mammary secretions during involution. From the last day of milking to d 30 of involution, mean concentrations of lactoferrin and the 39-kdal protein increased from .82 +/- .35 to 78.5 +/- 12.43 mg/ml and from 11.8 +/- 3.8 to 84.4 +/- 21.1 micrograms/ml, respectively. The immunoassays described will be valuable for further studies on the synthesis and secretion of these proteins during mammary involution.
authors.affiliation: Department of Animal Sciences, University of Illinois, Urbana 61801.
authors.forename: J J
authors.initials: JJ
authors.lastname: Rejman
authors.forename: W L
authors.initials: WL
authors.lastname: Hurley
authors.forename: J M
authors.initials: JM
authors.lastname: Bahr
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006023:Glycoproteins / Q000032:analysis*; D007781:Lactoferrin / Q000032:analysis*; D007782:Lactoglobulins / Q000032:analysis*; D008321:Mammary Glands, Animal / Q000378:metabolism* / Q000502:physiology; D049590:Postpartum Period / Q000502:physiology*; D011247:Pregnancy
chemical_list: D006023:Glycoproteins; D007782:Lactoglobulins; D007781:Lactoferrin