Growth hormone, cyclic adenosine-3',5'-monophosphate and creatinine in relation to growth in the pig

28 male castrated pigs of the Land race, aged 90 to 110 days and of different growth were used as animal models. The parameters investigated were as follows: body weight at the time of investigation, density of carcass, creatinine excretion per 24 hours, glucose concentration in whole blood, the concentration of free fatty acids, growth hormone, fluorescence positive corticosteroids, cAMP and insulin in the blood plasma. The results show that there exists an obvious relation between the growth hormone concentration and growth progress in the pig, but it can be revealed only through an integrated growth hormone concentration. That is why the conclusion seems to be justified that the corticosteroid concentration in plasma, an integrated growth hormone concentration in plasma, the cAMP concentration in plasma and the amount of creatinine in urine within 24 hours are parameters which are related to the intensity and quality of growth in the pig.