Urinary excretion of purine derivatives in dry buffalo and Frisian cow.

Aim of this paper was to compare urinary purine derivatives (PD) excretion in Italian Mediterranean dairy buffaloes and Fresian dairy cows during dry period. Six buffalo and six dairy cows at about 60 days to delivery were housed in individual cages and fed the same diet. Feed intake was monitored daily. After a period of adaptation, total daily urine was collected, weighed, sampled in test-tubes and frozen up to HPLC analysis. During the urine recovery period the daily feed intake was higher for dairy cows (kg/DM 9.0 us 7.6) even if differences were not significant due to the high individual variability. Urine excretion was significantly (P