. Diseases of domesticated birds. Poultry; Poultry; Birds. Fig. 13. Diagram of life cycle of Eimeria (cocci- dium) avium. (Fantham) B-H. Illustrate the asex- ual reproduction (schizog- ony) of B. avium. Epithe- lial host cells diagrammat- ically outlined. I-L. Illustrate the pro- duction of sexual forms (gametogony). N-T. Illustrate spore formation (sporogony). A. Sporozoite or primary infecting germ which pene- trates the epithelial cell of the duodenum of the host. B. Sporozoite curving on itself before becoming rounded within the host cell. C. Young, growing para- site. D. Fully grown paras
. Diseases of domesticated birds. Poultry; Poultry; Birds. Fig. 13. Diagram of life cycle of Eimeria (cocci- dium) avium. (Fantham) B-H. Illustrate the asex- ual reproduction (schizog- ony) of B. avium. Epithe- lial host cells diagrammat- ically outlined. I-L. Illustrate the pro- duction of sexual forms (gametogony). N-T. Illustrate spore formation (sporogony). A. Sporozoite or primary infecting germ which pene- trates the epithelial cell of the duodenum of the host. B. Sporozoite curving on itself before becoming rounded within the host cell. C. Young, growing para- site. D. Fully grown parasite (Trophozoite). E. Schizont, with numer- ous daughter nuclei peri- pherally arranged. (Seen in transverse section.) F. Schizont, showing fur- ther differentiation of mero- zoites. G. Merozoites arranged " en barillet," about to issue from the host cell. H. Free merozoites. 19. Young macrogame- tocyte with coarse granules. Icf. Young microgametocyte with fine granules. J9. Growing female mother cell, showing chromatoid and plastinoid granules. Jd'. Microgrametocyte vpith nucleus divided to form a number of bent, rod- like portions, the future microgametes. K9. Macrogamete which has formed a cyst wall for itself but left a thin spot for the entry of the microgamete. Kef. Microgametocyte with many biflagellate microgametes about to separate from it. L. Fertilization. One microgamete is shown penetrating the macrogamete, while other male cells are near the micropyle but will be excluded. M. Fertilization. The male pronucleus is lying above the female chromatin. Degenerating microgametes are shown outside the oocyst. N. Oocyst (encysted zygote) with contents filling it completely. 0. Oocyst with contents concentrated, forming a central, spherical mass. Many such cysts seen in infected cecal droppings. P. Oocyst with four nuclei. Q. Oocyst with contents segmented to form four rounded sporoblasts. (As seen in fresh preparations.) R. Oocyst with four sporoblasts which have
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, booksubjectpou
