Hubungan Antara Konsumsi Protein Pakan Dengan Produksi, Kandungan Protein Dan Laktosa Susu Sapi Perah Di Kota Salatiga (Relationship Between Crude Protein Intake, Milk Production, Milk Protein and Lactose of Dairy Cows at Salatiga District)

This research was conducted to examine the relationship between crude protein (CP) intake and milk production, milk protein and lactose on dairy cows in Salatiga District. A total of 30 dairy cows in the lactation month of 2-3 and lactation period of 2-3 were used. The result showed that dry matter (DM) intake, CP content and CP intake were 13.29 kg/d, 11.33% and 1.01 kg/d, respectively. Milk production was 9.96 L/d or equal to 10.28 kg/d with the contents of protein and lactose in milk were 2.70% (0.28kg/d) and 4.10% (0.4 kg/d), respectively. The correlation between CP intake and milk production were fitted to the quadratic linear regression relationship (r= 0.385). Similarly, the correlation between CP intake and milk protein content also follow the quadratic linear regression (r= 0.349). Moreover, the relationship between milk lactose with CP intake and milk lactose with total milk production were fitted to the linear models (r= 0.17, r= 0.46). It could be concluded that CP intake have quadratic relationship with milk production and milk protein. Milk lactose have a linearly relationship with CP intake and total milk production