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• W2136647536 abstract "The pregnancy-associated glycoproteins (PAGs) are a large gene family expressed in trophoblast cells of ruminant ungulates. The detection of PAGs (more specifically, PAG-1) in maternal serum has served as the basis for pregnancy detection in cattle. Unfortunately, PAG-1 and/or antigenically-related PAGs exhibit a long half-life in maternal serum (>8 d) and can be detected 80–100 d post-partum, thereby producing false positives in animals bred within 60-d of calving. The goal of the present studies was to develop a monoclonal-based assay that targeted early-pregnancy PAGs whose persistence in maternal serum post-partum might be relatively short-lived. Three anti-PAG monoclonal antibodies that recognized distinct subsets of PAGs were selected and used as trapping reagents in a ‘sandwich’ type of enzyme-linked immunosorbant assay (ELISA). A polyclonal antiserum with broad specificity was used for detecting bound PAGs. A total of 42 cows and heifers were bled daily on day 15, days 22 to 28, and then weekly throughout pregnancy and for 10 weeks (∼70 d) into the post-partum period. The ELISA was able to detect PAG in maternal serum of all animals unambiguously by day 28 post-insemination (PAG concentration: 8.75 ± 3.04 ng/mL). In maternal serum, PAG concentrations peaked during the week of parturition at 588.9 ± 249.9 ng/mL, and after calving, PAG was completely cleared (half-life: 4.3 d) by eight-week post-partum in 38 of 40 of the animals tested and was at very low concentrations in the remaining two (1.4 and 4.9 ng/mL, respectively). In summary, a monoclonal-based assay has been established that is sensitive enough to detect PAG in maternal serum by the forth week of pregnancy, but does not suffer from carry-over of antigen from a previous pregnancy." @default.
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• W2136647536 date "2005-03-01" @default.
• W2136647536 modified "2023-10-10" @default.
• W2136647536 title "The establishment of an ELISA for the detection of pregnancy-associated glycoproteins (PAGs) in the serum of pregnant cows and heifers" @default.
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• W2136647536 doi "https://doi.org/10.1016/j.theriogenology.2004.07.011" @default.
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• W2136647536 hasPublicationYear "2005" @default.
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