Abstract
The objective of this study was to determine the association between circulating (Progesterone, oestradiol-17β and P4/E2 ratio) concentrations and embryonic loss in Friesian cows under Egyptian condition. On day 25 by both progesterone (P4) level and sonography, 65.71% (69/105) cows were continued their gestation normal and 17.14% (18/105) cows not conceived. While, 17.14% (18/105) of inseminated cows showed high P4 level firstly and decline before day 25 suspecting early pregnancy loss, EPL. Also, 5 cows (7.25%) of the pregnant cows lost their feti from day 25 to day 45 (late pregnancy loss, LPL) were detected. Progesterone concentrations was noticed that increased P4 level starting from day 4 to day 7after AI in cows diagnosed pregnant (P
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