Ferdiansyah, Muhammad Billy, Iwan Sahrial Hamid, Herry Agus Hermadi, Abdul Samik, and Tatik Hernawati. 2022. “PH and Ferning Score of Cervical Mucus Related to Gestation and Calf Gender of Holstein Friesian Crossbreed Cows”. Ovozoa: Journal of Animal Reproduction 11 (1):22-26. https://doi.org/10.20473/ovz.v11i1.2022.22-26.