Effect of varrying levels and degradability of dietary protein on nutrient utilization and milk production in Murrah buffaloes fed grass legume forage based diet
2007
Pailwan, G.H. | Karanani, L.K. | Singh, Sultan | Maity, S.B.
A 150 d lactation trial was conducted on IS Murrah buffaloes divided into 3 groups, G1, G2 and G3, of 5 in each based on their body weight and milk yield to study the effect of level and degradability of dietary protein using berseem fodder and dry mixed grass based diet on nutrient utilization and milk yield. The concentrate mixture of GI, G2 and G3 animals contained 19.16, 18.88 and 15.01% CP, respectively. The ruminal CP degradability of concentrate mixture in G1 was 70% and in G2 and G3 was 50%. Animals were fed isocaloric diet containing roughage and concentrate in a ratio of 70:30. DM, OM, TDN and ME was similar among groups, however, DCP intake was higher in GI (1.10 kg) and G2 (1.07 kg) than in G3 (0.96 kg) as CP content of concentrate in Gl and G2 was about 20% higher than in G3. RDP to UDP intake in G1, G2 and G3 was 76:24, 68: 32 and 69:31, respectively. Nutrient digestibility did not vary significantly among groups, however urinary N excretion was significantly lower (P0.05) in G3 than in others. Blood glucose and plasma protein concentrations in different groups were similar. Plasma urea level (mg/dl) was lower (P0.05) in G3 (11.32) than in G1 (15.93) and G2 (12.09) and the trend was similar to milk urea, however milk composition was not affected by dietary treatments. The average FCM yield (kg) was higher in G2 (9.08) than in G1 (8.80) and in G3 (8.55), however variation among groups was not significant. The results suggested that increasing the UDP content of concentrate mixture from 30 to 50% in a berseem-mixed grasses based ration in lactating buffaloes, producing daily about 8-9 kg FCM, CP content of concentrate mixture can be reduced from 19 to 15% without affecting milk production.
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