Difference between revisions of "Maternal Recognition of Pregnancy - Anatomy & Physiology"
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== Overview == | == Overview == | ||
+ | {| style="width:75%; height:200px" border="1" | ||
+ | |||
+ | !'''Species''' | ||
+ | !'''Cow''' | ||
+ | !'''Ewe''' | ||
+ | !'''Sow''' | ||
+ | !'''Mare''' | ||
+ | !'''Queen''' | ||
+ | !'''Bitch''' | ||
+ | |- | ||
+ | | '''Preganacy Recognition Factor''' | ||
+ | | Bovine Interferon tau | ||
+ | | Ovine Interferon tau | ||
+ | | Oestrogen and Pituitary Prolactin | ||
+ | | Unidentified | ||
+ | | Pituitary Prolactin | ||
+ | | None Required | ||
+ | | | ||
+ | |} | ||
== Ruminants == | == Ruminants == |
Revision as of 21:31, 13 September 2008
|
Overview
Species | Cow | Ewe | Sow | Mare | Queen | Bitch | |
---|---|---|---|---|---|---|---|
Preganacy Recognition Factor | Bovine Interferon tau | Ovine Interferon tau | Oestrogen and Pituitary Prolactin | Unidentified | Pituitary Prolactin | None Required |
Ruminants
- The free-floating blastocyst produces specific proteins that signal to prevent luteolysis.
- Sheep blastocysts produce ovine interferon tau (OIFN-τ)
- Cattle blastocysts produce bovine interferon tau (BIFN-τ)
- Interferon tau is a small protein produced by trophoblastic cells of the blastocyst.
- It is present in the uterus at day 13-21 after ovulation.
- It is not luteotrophic, so does not enhance progesterone production by the corpus luteum.
- Instead, it binds to the uterine endometrium and inhibits the synthesis of oxytocin receptors.
- In addition to preventing the upregulation of oxytocin receptors, interferon tau binds to the apical portion of uterine glands to promote synthesis of proteins that are critical for embryonic survival pre-implantation.
- As a result, there is no production of the luteolytic factor PGF2α and the corpus luteum is maintained.
- The corpus luteum then produces progesterone to maintain the pregnancy.