Udin, Z., Rahim, F., Hendri, H., & Yellita, Y. 2017 Jan 13. Waktu dan Kemerahan Vulva Saat Inseminasi Buatan Merupakan Faktor Penentu Angka Kebuntingan Sapi di Sumatera Barat (TIME AND REDDISH SIGN OF VULVA DURINGARTIFICIAL INSEMINATION AS A DETERMINANT FACTORS ON CONCEPTION RATE OF COW IN WEST SUMATERA). Jurnal Veteriner. [Online] 17:4