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Changes in Total Body Water and Dry Body Weight with Age and Body Weight in Friesians and Water Buffaloes

Bioclimatology Unit, Radiobiology Division Atomic Energy Establishment, Cairo, United Arab Republic

ABSTRACT

Ninety Friesian and 153 Water Buffalo cows, 6 to 60 months and 100 to 500 kg body weight, were used in this study. Total body water was determined by ³H-radioisotope dilution technique and dry body weight deduced by subtracting total body water from live body weight. In Friesians and Buffaloes there were significant positive correlations (P < 0.01) between age and each of live body weight (r = 0.7228, 0.8990), dry body weight (r = 0.6728, 0.8305), and total body water in liters (r = 0.3860, 0.6150), whereas there were significant negative correlations (P < 0.01) between age and total body water in liters/100 kg live body weight (r = 0.2968, –0.3795) and in liters/100 kg dry body weight (r = –0.2427, –0.2990). Moreover, live body weights in Friesians and Buffaloes were positively correlated with dry body weight at P < 0.01 (r = 0.8450, 0.9167) and with total body water in liters at P < 0.01 (r = 0.8972, 0.9508). Linear regressions were made for each of live body weight, dry body weight, and total body water, in liters, liters/100 kg live body weight, and liters/100 kg dry body weight, on age, as well as for each of total body water in liters, and dry body weight on live body weight.