抄録
The transfer rate of radioactive cobalt to the eggs of hens and Japanese quails was investigated. No activity was found in the 1 st egg laid within 24 hours after oral dosing in the both species of birds. When 60Co was given orally to the laying hens, the 60Co content in the yolks became higher in the 2 nd and 3 rd eggs followed by a marked decrease with time. The cumulative amount of 60Co in the hen's egg yolks for 14 days after oral dosing was estimated to be around 0.1% of the dose. In addition, the 58Co content in the yolks was measured in the Japanese quails after single or daily intraperitoneal injection. It was found for the both modes of administration that the radioactive cobalt was mainly incorporated into the egg yolk, and very little to the albumen and shell, if any. Moreover, the whole-body retention of 58Co was investigated after single or daily intraperitoneal injection in the Japanese quails.
