Effect of exogenous oxytocin on the expression of oxytocin receptor gene and uterine involution in local Iraqi cows

Abstract EN

The present work aimed to study the effect of exogenous oxytocin injection on the expression of the oxytocin receptor gene and the duration of uterine involution in the local Iraqi breed of Karradi cows.

Twenty cows were divided into two groups.

The first group was considered a control; the second group was injected with 100 IU/IM of oxytocin twice weekly for four weeks postpartum.

The uterine involution velocity was monitored using ultrasonography by measuring the endometrium thickness, ovarian diameter, cervix diameter, uterine horns diameter, serum progesterone, and estrogen levels by indirect ELISA, and the expression of oxytocin receptor gene was monitored by conventional PCR.

The result of the treated group showed that the progesterone concentration was significantly decreased.

The estrogen concentration was significantly increased.

Moreover, the endometrium thickness was significantly decreased in the second, third, and fourth weeks, also, the ovarian diameter was significantly decreased in the first and second weeks, but it has significantly increased in the fourth week.

In addition, the cervix diameter was significantly decreased in the first and second weeks, and the uterine horns diameter was significantly decreased in all weeks compared to the control group at POTXRs gene overexpression, where OTXRs gene expression was increased in the oxytocin group in comparison with the control group.

This result was present in a coordinated manner with the result of the estrus cycle and ovarian reactivation.

We conclude that injection of exogenous oxytocin at 100 IU/IM twice weekly for four weeks postpartum will increase the expression of the oxytocin receptor gene, leading to a decrease in the duration of uterine involution.

Accelerate the occurrence of estrus in the local Iraqi breed of Karradi cows.