Deduction of a model for sperm storage in the oviduct of the domestic fowl Gallus domesticus. Sperm Uptake into the SSTs Because of a thick and opaque oviductal wall in avian species, it is difficult to observe sperm movement in the oviduct directly. Sexual selection and the temporal separation of reproductive events: Scanning electron microscopic observation revealed that the SSTs shrank due to the injection of progesterone, and a bundle of the sperm tail extruded from the SSTs was observed Fig. To achieve fertilization, the resident sperm must be released from the SSTs in order to migrate to the site of fertilization, which is infundibulum part of the oviduct. J Anim Sci ; Journal of Insect Physiology. There are many ways that females can alter offspring genetics to increase their success and diversity.
