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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1997;10(4): 364-370.
DOI: https://doi.org/10.5713/ajas.1997.364    Published online August 1, 1997.
Effect of rumen degradable protein (RDP) in straw based ration on purine derivatives excretion and microbial nitrogen supply in cattle
Z. H. Khandaker, A. M. M. Tareque
Four local cattle were (145吏?.7 kg) used in a 4 ??4 Latin square design to study the effect of different levels of rumen degradable protein (RDP) in straw based ration on purine derivatives excretion and microbial N suppy in cattle. The four rations were formulated at the same amount of energy but varying RDP approximately 50 (U0), 75(U1), 100(U2) and 150(U3) percent levels of RDP requirement for maintenance. They were fed ranged from 101 to 304 g RDP/d. Apparent digestibility of all nutrients increased significantly (p < 0.01) in cattle fed ration U2 than other rations. Rumen NH3-N concentration increased from 43 to 130 mg/l in response of RDP intake. Purine derivatives excretion increased significantly (p < 0.01) with incremental level of 203 g RDP/d (U2) intake and positively correlated (r=0.69, p < 0.01, n=16) with amount of RDP intake. The rates of rumen microbial N supply were 16.8, 27.2, 39.1 and 32.9 g/d for rations U0, U1, U2 and U3 respectively. Efficiency of microbial N supply (EMNS) per kg of DOMR were 19.0, 25.3, 33.0, and 28.6 g and per MJ of ME. Intake were 0.62, 1.00, 1.44 and 1.21 g for U0, U1, U2 and U3 respectively and highest results were obtained in cattle fed U2 ration. Results of this study suggest that PD excretion and EMNS were increased as incremental level of RDP intake (U2) in local cattle.
Keywords: Rumen Degradable Protein; Purine Derivatives; Microbial Nitrogen; Cattle

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