A study was conducted on 16 lactating Gir cows, which were divided into four groups on the basis of body weight and average milk yield/day at Dairy farm (LPM Deptt.) S.K.N. College of agriculture, Jobner (Rajasthan) and subjected to four dietary treatments i.e. Wheat straw ad-lib.+ Green Lucerne (5 kg) + Concentrate (T1), T1 + Urea 75 g/cow (T2), T1 + Mustard oil cake 614 g/cow (T3) and T1 + Guar meal 505 g/cow (T4). The studied for their nutrients utilization of protein supplements and milk yield of Gir cows. Average daily intake of CP and DCP in kg/100 kg body weight was significantly higher (P<0.05) in T4 compared to other groups. Average daily TDNI kg/100kg body weight was significantly higher (P<0.05) in T4 (1.56) compared to T3 (1.41), T2 (1.32) and T1 (1.24) groups. The nutrient utilization as DM, CP, EE and NFE was significantly (P<0.05) higher in T4 compared to T3, T2 and T1 groups. Crude fibre was significantly (P<0.05) higher in T3 compared to T4, T2 and T1 groups. Average daily milk production (litre/cow) was significantly (P<0.05) higher in T4 (7.85) than T3 (7.13), T2 (7.05) and T1 (6.67). It can be inferred from this experiment that feeding of concentrate mixture on Wheat straw diet with Guar meal supplement increased the milk production.

Highlights

• We studied on effect of protein supplements on Nutrient Utilization and Production of Lactating Gir Cows
• Feeding of Guar meal increased the milk production and digestibility as compared to Urea and Mustard oil cake in Gir cows.
• Guar meal may be increased palatability and utility of poor quality roughage.