. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORPUS ALLATUM AND CASTRATION 195 Additional methodological matters, such as hemicastration, will he mentioned in the text. RESULTS a. Females \Yhen the volumes of the corpora allata of all gonadectomized females studied were plotted according to adult age (Fig. 1), several facts became apparent. All age groups with the exception of the youngest and the oldest showed a considerable spread in corpus allatum size. Starting from glands whose volume 64 60 56 52 48 44 136 c ~32 LJ 2 28 Q24 20 16 12 8 4 —b _—a I I. I I I 40 80 120
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORPUS ALLATUM AND CASTRATION 195 Additional methodological matters, such as hemicastration, will he mentioned in the text. RESULTS a. Females \Yhen the volumes of the corpora allata of all gonadectomized females studied were plotted according to adult age (Fig. 1), several facts became apparent. All age groups with the exception of the youngest and the oldest showed a considerable spread in corpus allatum size. Starting from glands whose volume 64 60 56 52 48 44 136 c ~32 LJ 2 28 Q24 20 16 12 8 4 —b _—a I I. I I I 40 80 120 160 200 240 280 320 360 400 440 ADULT AGE (in days) FIGURE 1. Diagram showing the size variation of corpora allata of 154 ovariectomized Lcucophaca arranged according to adult age. Each dot represents the measurement of the paired glands from one individual. The arrows indicate that, with increasing age, the volumetric maxima rise stepwise to reach peak values in a mid-period (140-280 days; shaded area), and gradually decline in old age. For comparison, three maximum levels of corpus allatum size in groups of non-castrate animals are indicated on the scale: a, First activity cycle preceding first ovulation of normal controls; b, Second activity cycle following first parturition in normal controls ; c, Response to feeding following drastic starvation. matches that of the smallest inactive glands in normal controls, through specimens appearing moderately or fully active, the range extends to organs much larger than any observed in the previous studies of this series. These supernormal values seem to be unique for gonadectomized females. They are, therefore, of primary interest, even though their number in the present series is comparatively small. A total of 26 animals surpasses the maximum size of the corpora allata characteristic of the second reproductive cycle of normal Please note that these images are extracted from scanned page images that may have been dig
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
