[en] The experiment has been performed on guinea pigs which were irradiated by gamma rays with doses of 0, 150, 300 and 600 rad. Observations were carried out on peripheral blood in regard to red blood cell, white blood cell and haemoglobine, every week after irradiation. +he result obtained showed that 150 rad was the optimal stimulation effective dose for antibody production in guinea pigs. (author)

[en] An experiment was carried out in 24 female White Leghorn Chickens by using ¹³¹I as tracer. The chickens were initially and intraperitoneally injected with 10μCi of ¹³¹I and then counted by means of a Gamma Well Type Scintillation Counter every 48 hours. A dose of 0,3 μg of thyroxine per 100 gr body weight was given as the first administration. After every two administrations of similar dose, the dose of the thyroxine was increased by 0,1 μg/100g body weight until the thyroxine secretion rate was reached. The injections were given in the neck region subcutaneously. The thyroxine secretion rate was found to be within the range from 0,5μg to 0,8μg per 100 g body weight. It also showed that the higher the thyroxine secretion rate, the higher the egg production became. This phenomenon occured both with the 7 and 9 months old chickens. However there was neither ralationship between the thyroxine secretion rate and the weight of eggs produced nor with the body weight of the chickens themselves. (author)