鶏気嚢の研究 : II.孵化後の気嚢発育について

概要

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This experiment was undertaken because no data existed concerning the changes of the air sacs in the three different growing stages ; immediately after hatching, 15 day-old, and adult domestic fowls. The main observations were made on the relation between the location of the air sacs and the other internal organs in the mold specimens, and in the morphological changes of each air sac using the method of agar-injection to the sacs. Structures of the air sacs in chicks 15 days after hatching were similar to those in adult domestic fowls, including remarkable development of the internal organs and absorption of the yolk in the body. However, the air sacs were pressed by the yolk in the abdominal portion, when the chicks were just hatched. In volume percentage of each air sac, a higher percentage in posterior thoracic, anterior thoracic and axillary sacs and a lower percentage in abdominal and cervical sacs were shown in the chickens as compared with those in adult fowls. In the growing stage, no remarkable differences in percentage between chickens weighing 500.5〜1, 000gm and the adults were found. As to the result of this experiment, it is suggested that the posterior and anterior thoracic sacs in the growing stage of the chickens might interact as the main pathway of the respiratory function.
帯広畜産大学の論文
1977-07-25