EFISIENSI DAN PERSISTENSI PRODUKSI SUSU PADA SAPI FRIESIAN HOLSTEIN AKIBAT IMBANGAN HIJAUAN DAN KONSENTRAT BERBEDA (The Efficiency and Persistency of Milk Production on Friesian Holstein Dairy Cows Fed at Different Forage and Concentrate Feeding Ratio) - Anggiati, Gita Tri (Animal Agriculture Journal, 2016)