Correlation between plasma progesterone concentrations and fecal Progestins during the estrus cycle of Kedah Kelantan cows

N. Yimer(1*)

(1) Department of Veterinary Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
(*) Corresponding Author


The aim of the present study was to determine the correlation between circulating plasma progesterone (P4) levels and feacal progestins during the estrus cycle of Kedah Kelantan (KK)cows. A total of 12 KK cows pre-synchronized for estrus were subjected to blood and matched fecal sampling twice a week for about 3 cycles. The concentration of progesterone in the plasma and progestins in the fecal samples were determined by using a commercial progesterone radioimmunoassay (RIA) kit (ACTIVE® Progesterone RIA, DSL-3900, USA). A significant positive correlation between the concentrations of fecal progestins and plasma P4 was observed (r = 0.66, p<0.001), as tested for the whole group with the exception of one animal. This implies that the non- invasive measure of fecal progestins using a DSL-3900 RIA kit can be used to monitor the ovarian activity of KK cows. Furthermore, this technique might have also a potential application in monitoring the reproductive activity of captive and free ranging wild life ruminants.


plasma, fecal, progesterone, progestin, ovarian cycle, KK cows

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