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Question If I put a rooster in with a hen how long will it be till she lays fertile eggs?
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Question If I put a rooster in with a hen how long will it be till she lays fertile eggs?
-- Most birds do not have a phallus and, in these species, insemination occurs via the so-called ‘cloacal kiss.’ Depending on taxa, sperm are ejaculated into the cloaca or vagina and rely on their motility to reach the numerous sperm-storage tubules (SSTs) located at the junction of the vagina and the uterus. As a consequence of selection during their migration through the vagina, only 1–2% of inseminated sperm enter the SSTs, the rest are probably ejected the next time that the female defecates. The SSTs contain only morphologically normal sperm, suggesting either that only normal sperm successfully traverse the vagina or that only normal sperm are ‘accepted’ by the SSTs. An unknown but probably small proportion of sperm move directly to the infundibulum (the site of fertilization) without entering the SSTs, although these are likely to fertilize only a single ovum.
That sperm in the SSTs are invariably positioned with their heads directed towards the distal end of the tubule suggests that egress from the SSTs is passive. Sperm are lost from the SSTs more or less continuously at a constant per capita rate. They enter the uterus and are carried passively to the infundibulum. Sperm accumulate or move relatively slowly through the infundibulum so that there is usually a population available to fertilize each ovum as it is ovulated. On ovulation, the ovum is captured by the prehensile, funnel-shaped infundibulum and the sperm swarm over the surface of the ovum; their target is the germinal disc, which contains the female pronucleus. At this stage, the ovum is bounded by the inner perivitelline layers (IPVL). The clustering of sperm and holes made by sperm in the IPVL around the germinal disc suggest that sperm might use chemical signals to locate the germinal disc.
In contrast to most other taxa, where only a single sperm enters the ovum, polyspermy is typical in birds. Several sperm enter the germinal disc region, hydrolyzing the IPVL via the acrosome reaction of the sperm, whereby the release of enzymes from the sperm acrosome enables the sperm nucleus to enter the ovum. However, only a single spermatozoon fuses with the female pronucleus and the remaining sperm are shifted to the periphery of the germinal disc and play no further part in development. Fertilization includes the penetration of ovum by sperm as well as the fusion of the male and female pronuclei (syngamy). Because embryo development begins almost immediately, many cell divisions have occurred by the time the ovum has become incorporated into the egg and the egg is laid (in most species) 24 hr later.http://people.eku.edu/ritchisong/avianreproduction.html
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