ÇOYAN, K., AKSOY, M., ALAN, M., IŞIK, K.,  & TEKELİ, T. (1990). Luteolytic Effect of Reduced Dose Of Cloprostenol Monitored By Changes In Vaginal Resistance And Clinical Signs Of Estrus In Heifers. <i>Livestock Studies</i>, <i>30</i>,  031-039. http://doi.org/