Abstract
Radioactive Phosphorus $(^{32}P)$ was administered intramuscularlly to the newly hatched chicken in the purpose of determination of the uptake and the distribution, as related to sex and hour differences of the several organs of the bodies. $2\;{\mu}\;of\;^{32}P$ was administered to each chick, and the distribution of 32P was observed in 1 hour and 24 hours after administration. In this experiment 80 heads of chicken were used(40 chicken were one day and 40 chicken were 7 days old) and the results obtained as follows: 1. The tissue showed an uptake rate of $^{32}P$ dose per 100 milligram of tissue in one day old chicken, with the following sequence: Males (1 hour): Femur. Liver. G., Muscle. Testis. Brain (24 hour): Femur, Testis, Gastrocnemius Muscle, Liver, Brain. Female(1 hour): Femur, Liver, Gastronemius Muscle, Ovary, Brain. (24 hour): Femur, Liver, Gastrocnemius Muscle, Ovary, Brain. 2. In 1 hour, the uptake rate of $^{32}P$ of the tissues showed significant difference between the male and the female except the gastrocnemius muscle and the brain in one day old group, but they were no significance except the testis and ovary after 24 hours. 3. The distribution of $^{32}P$ of the tissues exhibited higher in 1 hour than in 24 hours except the femur, the brain of the male and female, the brain and gastrocnemius muscle of the female in one day old group. 4. The tissue showed an uptake rate of $^{32}P$ dose per 100 miligram of tissue in 7days old chicken, with the following sequence: Male (1 hour): femur, liver, gastrocmenius muscle, testis, brain. (24 hour): femur, testis, gastrocmenius muscle, liver, brain. Female(1 hour): femur, liver, gastrocmenius muscle, ovary, brain. (24 hour): femur, ovary, liver, gastrocmenius muscle, brain. 5. The distribution of $^{32}P$ of the tissues showed no significant difference between the male and the female except the testis and ovary after 24 hours in 7 days old chicken group. 6. The distribution of $^{32}P$ the tissues exhibited higher in 1 hour in 24 hours except the femur, the brain of the male and the female, the brain and the ovary of the female in 7 days old chicken group.