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This study was designed to establish the factors, if any, which could affect plasma pregnancyassociated glycoprotein1 (PAG1) expression in a study population of 87 pregnant, highproducing dairy cows. The factors examined were: semen providing breed (HolsteinFriesian vs Limousin), outcome of gestation (male vs female newborn, and singleton vs twin pregnancies), lactation number, milk production at pregnancy diagnosis, plasma progesterone concentration, season of gestation (warm period, March–November vs cool period, December–February), and day of gestation (40, 90, 120, 150, 180 and 210). Pregnancy was diagnosed by transrectal ultrasound on day 40 postinsemination and by palpation per rectum on days 90, 120, 150, 180 and 210. Blood samples were collected from each animal immediately before each pregnancy diagnosis. The relative contributions of the different factors on …