Changes

* Provides a physical barrier to the uterus therefore preventing abortion due to infection by isolating the foetus from the external environment, closure is via the mucosal folds.

* Provides a physical barrier to the uterus therefore preventing abortion due to infection by isolating the foetus from the external environment, closure is via the mucosal folds.

* Cervical mucosa produces a mucous secretion which forms a mucous plug that helps close the cervical canal.  This is easily expelled during oestrus and parturition.

* Cervical mucosa produces a mucous secretion which forms a mucous plug that helps close the cervical canal.  This is easily expelled during [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]] and parturition.

* Barrier to sperm transport in the ewe, cow, bitch and queen, but not in the sow and mare.

* Barrier to sperm transport in the ewe, cow, bitch and queen, but not in the sow and mare.

* Assists with the storage and survival of sperm by admitting sperm to the genital tract at a time when fertilisation is possible (around ovulation).

* Assists with the storage and survival of sperm by admitting sperm to the genital tract at a time when fertilisation is possible (around ovulation).