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Sperm penetration of the eutherian zona pellucida is unlikely to be a lytic event. Steele MG, Wishart GJ a Demonstration that the removal of neuraminic acid from the surface of chicken spermatozoa impedes their transvaginal migration. Chapman and Hall, London Google Scholar. Howarth B Jr a An examination for sperm capacitation in the fowl. The embryonic development in birds occurs in the blastodisc also called germinal disc or germinal layer. Wassarman PM Mammalian fertilization.

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Steele MG, Wishart GJ a Characterisation of a mechanism impeding sperm transport through the vagina of the chicken. Ho J, Meizel S Electrophoretic detection of multiple forms of trypsin-like activity in spermatozoa of the domestic fowl. Therefore, the sperm cells have to pass the whole way through the oviduct from the cloaca up to the infundibulum. Holm L A comparative study of avian oviducal sperm storage with special reference to factors which regulate sperm motility.

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Gray AP Bird hybrids. This process is experimental and the keywords may be updated as the learning algorithm improves. Symp Zool Soc Lond Asian Aust J Anim Sci 7. Jensen C Ultrastructural changes in the avian vitelline membrane during embryonic development. Therefore, the sperm cells have to pass the whole way through the oviduct from the cloaca up to the infundibulum. Sperm penetration of the eutherian zona pellucida is unlikely to be a lytic event.

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Description: Sibley CG On the phylogeny and classification of living birds. Romanoff AL The avian embryo. Fujii S Scanning electron microscopical observation on the penetration mechanism of fowl spermatozoa into the ovum in the process of fertilisation. Yanagimachi R Mammalian fertilization. Bedford JM Mammalian fertilization misread. Ho J, Meizel S Electrophoretic detection of multiple forms of trypsin-like activity in spermatozoa of the domestic fowl. Academic Press, London Google Scholar. The two semi permeable shell membranes are formed at the isthmus while the poriferous calcified shell is set off in the uterus.
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