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 [[Reproductive_Behaviour_-_Oestrus_Behaviour_- Anatomy & Physiology|oestrus]] and [[Reproductive_System_- Anatomy & Physiology#Parturition|parturition]].

* Cervical mucosa produces a mucous secretion which forms a mucous plug that helps close the cervical canal.  This is easily expelled during [[Oestrus Behaviour - Anatomy & Physiology|oestrus]] and [[Reproductive_System_- Anatomy & Physiology#Parturition|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%2C_Implantation_and_Early_Embryonic_Development_-Fertilisation- Anatomy & Physiology|fertilisation]] is possible (around [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]]).

* Assists with the storage and survival of sperm by admitting sperm to the genital tract at a time when [[Fertilisation%2C_Implantation_and_Early_Embryonic_Development_-Fertilisation- Anatomy & Physiology|fertilisation]] is possible (around [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]]).