• 作者： 黃木秋; 宋永義
• 作者服務機構： 國立中興大學畜物學系; 國立臺灣大學畜牧學系
• 中文摘要： 本試驗從睪丸組織學檢查探討菜鴨及土番鴨睪丸生殖細胞之變化。 試驗結果顯示，菜鴨在7週齡前、土番鴨在15週齡前睪丸之增重甚為緩慢。不同週齡菜鴨睪丸之增重速率及睪丸重佔體重之百分比顯較土番鴨者為高，然而就體重之增加而言則反是。 在土番鴨之生精細管中，雖然可以發現精原細胞及初級精母細胞，但迄52週齡止，並未發現次級精母細胞、精細胞或精子，此顯示減數分裂並未發生。 在菜鴨的生精細管中，一週齡時，己可發現精原細胞。第3週齡時，部分公鴨之生精細管出現初級精母細胞。第5週齡時，部分公鴨之生精細管已出現次級精母細胞，顯示減數分裂已經發生，有的公鴨之次級精母細胞並已分裂成精細胞。7週齡時，部分公鴨之生精細管之精細胞已變形而成為精子。第9週齡起，所有公鴨之睪丸均有精子出現。睪丸內出現精子之生精細管之百分率，隨著週齡之增加而升高，至15週齡起，已逐漸趨於穩定狀態。此時由副睪之組織切片可以觀察至管腔內充滿大量的精子。以第15及19週齡之公鴨精液進行配種試驗，結果顯示其受精率與得自成熟公鴨者無異。
• 英文摘要： Experiments were conducted to study the germ cell of testes in the domestic drake (Tsaiya drake)and the mule drake. The histological sections of testes of both drakes were compared in this study. The results showed that rapid testicular growth did not occur until 7 weeks of age in domesticdrakes and 15 weeks of age in the mule drakes. The rate of growth of the testes and the increase in theratio of testes weight to body weight in domestic drakes at different ages were much more rapid thanin the mule drakes. However, the opposite results were found in the body weights. In the mule drakes, spermatogonia and primary spermatocytes colud be observed in the seminiferoustubules, but no secondary spermatocytes, spermatids or spermatozoa in seminiferous tubules were foundup to 52 weeks of age. This showed that the meiotic division had not occured in the mule drakes. In the domestic drakes, spermatogonia in the seminiferous tubules were observed at 1 week of age.Primary spermatocytes of some males appeared as early as the third week of age. Secondary spermatocytesand spermatids in the seminiferous tubules of some drakes began to appear at 5 weeks of age as a resultof the meiotic division of the spermatocytes. At 7 weeks of age, spermatids were in process of metamor-phosis, and spermatozoa were first observed in the seminiferous tubules of the drake. All testes of drakes9 weeks of age contained spermatozoa. The percentage of the seminiferous tubules containing spermatozoaincreased gradually with age, and approached a plateau at 15 weeks of age. Statisfactory levels of semenfertility were obtained from mating trials at 15 and 19 weeks of age.
• 中文關鍵字： development of testes; seminiferous tubules; germ cells of drakes
• 英文關鍵字： --