“Pengaruh Umur Beranak Pertama Terhadap Performa Produksi Susu Sapi Friesian Holstein di BBPTU-HPT Baturraden”, JIPTHP, vol. 4, no. 2, pp. 306–311, Aug. 2017, Accessed: Dec. 23, 2025. [Online]. Available: https://journal.ipb.ac.id/ipthp/article/view/17511