<div>Background: Estrus detection by observing behavioral signs are time consuming and ineffective method that causes approximately 21 days loss with a significant financial consequence. This study highlights the value of electrical resistance of vaginal mucus (ERVM) during estrus and its association with genital changes, follicle diameter and first service conception rate (FSCR) in crossbred cows. 
 
Methods: A total of 400 cows were selected from different states of North-East, India, out of which 200 numbers of cows were examined to determine the ERVM value prior to artificial insemination (AI) by using Draminski estrus detector.The remaining 200 number of animals were examined for studying the association of ERVM with genital changes, follicle diameter and FSCR.The ERVM value obtained prior to AI was divided into three groups such as 150-200 (Group I), 201-250(Group II) and 251-290 (Group III) ohm, comprising 50 animals in each group. A control groups comprising 50 animals were kept in the study.The genital changes were recorded by transrectal palpation and follicle diameters were recorded by using transrectal ultrasonographic (USG) probe. 
 
Result: The mean ERVM value prior to AI was 196.26&plusmn;1.25 ohm.The lowest ERVM value (150-200 and 201-250 ohm) was closely associated with free flowing vaginal discharge, open cervix, moderate tone of uterus and mature graffian follicle.The follicles diameters were differed significantly between groups. The FSCR was found to be higher when the cows were inseminated at ERVM value from 201-250 ohm. The result suggested that, ERVM value can be consider as a suitable tool for detection of proper time of AI in cows.</div>

Association of Electrical Resistance of Vaginal Mucus (ERVM) with Follicle Diameter and Conception Rate in Crossbred Dairy Cows