and this may have resulted in a decline in cow fertility [14]. The mean CCI of 112.0 days that we found in this study was similar to a previous report of a CCI of 98 to 122 days in the Asturiana de los Valles breed [15]. Reducing CCI can improve herd performance and profitability, and the CCI is affected by both CFSI and conception rate. Identifying nonpregnant cows early can shorten the reservice interval and reduce CCI. A nonpregnant cow is a nonproductive cow and results in increased feeding costs. Pregnancy testing using transrectal ultrasonography has advantages for the rapid and accurate early assessment of nonpregnant cows [16].