[Further observations and considerations on the biological and reproductive cycle of the roe buck (Capreolus capreolus L.)].

The authors have studied the seasonal microanatomical modifications of the ovary of the roe deer and testis of the roe buck. The ovary during the month of September presents primary, secondary and mature vesicular follicles. During the month of October there is the first presence of a corpus luteum. The corpora lutea during the months of November and December increase in size and blood supply; the cells are filled with acidophil granules. The corpora lutea persist also in January and February when embryos are implanted in the uterus. This result agrees with Short's and -Hay's but differs from that of Stieve. Testes show the first spermatogenic activity during the month of April. The spermatogenesis is completed in June, persists and reaches the top during July and August, when the Leydig cells acquire a strong acidophil cytoplasm. Indeed the spermatogenesis decreases during September and October; then, during winter months the testes are devoid of all signs of spermatogenic activity, the tubules being lined only be Sertoli cells and spermatogonia.