[Behavior of various blood constituents (glucose, fructose, insulin, lactate, pyruvate, free fatty acids, inorganic phosphate) and half-life of monosaccharides in the plasma after i.v. infusion of glucose, fructose, galactose and invert sugar solutions in ruminants. 2. Studies in cattle].

Monosaccharides were intravenously injected to eight adult heads of cattle, between 380 kg and 670 kg in live weight, to study, in the context of stress endurance, the half-life values of the sugars as well as monosaccharide effects upon concentrations of various blood components. The fructose concentration in the blood plasma went up temporarily following the infusion of glucose solution. Fructose infusion usually caused only little rise of the glucose concentration in blood plasma, with hypoglycaemia occurring quite often towards the end of an experimental period. The half-life values of sugar in blood plasma were between twelve and 29 and those of fructose between ten and 17 minutes. The rate of fructose conversion was higher than that of glucose conversion, but values were identical in some cases. The pyruvate concentration in the blood and the insulin level in blood plasma went up in response to infusion of monosaccharide solutions. Urine excretion of monosaccharides following invert sugar infusion was less than half of that in response to glucose infusion.