. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESULTS OF CASTRATION IN DUCKS. 45 given their liberty out of doors. This procedure at once revealed that two individuals carried sex feathers. As no males were with the flock, they were immediately examined carefully. Their band numbers, of course, provided the necessary identification. No. 4 (Fig. 9) in addition to the sex feathers, had breast feathers similar to those of the male's breast in summer plumage. In a few feathers, gray vermiculations were present. Such other. FIG. 10. Female 24, castrated. Photographed August.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESULTS OF CASTRATION IN DUCKS. 45 given their liberty out of doors. This procedure at once revealed that two individuals carried sex feathers. As no males were with the flock, they were immediately examined carefully. Their band numbers, of course, provided the necessary identification. No. 4 (Fig. 9) in addition to the sex feathers, had breast feathers similar to those of the male's breast in summer plumage. In a few feathers, gray vermiculations were present. Such other. FIG. 10. Female 24, castrated. Photographed August. modification as had taken place (e. g., very little buff in dorsal regions) was not beyond the range of variation in normal females. No. 24, Fig. 10, was rather more strongly modified. She had a very narrow white neck ring. The feathers of the breast were distinctly of the male type (Fig. 4, /, J). Those of the dorsal side of the lower neck region were of a type occasionally occurring in the same region in males. In other parts of the body there was a distinct tendency for the buff bands to become transverse. Compare Fig. 6, G, H. Feathers, more or less vermiculated, were quite common. A few found in the anal region, were in- distinguishable from similar male feathers. Compare Fig. 8, G with /.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
