Rizal, Syaiful, Suzanita Utama, Budi Utomo, Suherni Susilowati, Sri Mulyati, Ismudiono Ismudiono, and Soeharsono Soeharsono. 2020. “Interkorelasi Antara Persentase Konsentrat, Kadar Urea Nitrogen Susu Dan Beberapa Variabel Sapi Perah Friesian Holstein”. Ovozoa: Journal of Animal Reproduction 9 (2):53-59. https://doi.org/10.20473/ovz.v9i2.2020.53-59.