モリアオガエル幼生の生長および窒素排出物におよぼすプロラクチンの影響

概要

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Rhacophorus tadpoles, which have a tendency to grow rapidly to the metamorphic climax, were given injections of 5 I.U. prolaction every two days for about 2 or 3 weeks with resultant increases in body weight, tail length, and tail breadth. When injected with 2.5 I.U. prolactin every other day for 3 weeks the tadpoles weighing 0.16-0.17g became giant and their metamorphic process was delayed. However, the injection of even 5 I.U. prolactin was found to be ineffective on tadpoles of more than 0.35g body weight. As is seen in Table 3, the rate of ammonia excretion decreases to less than 50% when the prolactin administration was performed on tadpoles prior to the metamorphic climax, i.e., in Sts. XVI-XIX. This decrease is caused by the unusual excess secretion of urea due probably to the gigantic growth of the treated tadpoles.
1966-05-15