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* As the corpus luteum regresses between days 15-18, the colour rapidly changes to yellow, creamy yellow or buff.
 
* As the corpus luteum regresses between days 15-18, the colour rapidly changes to yellow, creamy yellow or buff.
 
* The mechanism of luteolysis is not fully understood in the sow.
 
* The mechanism of luteolysis is not fully understood in the sow.
** Corpora lutea are unresponsive to PGF2α until 12-23 days after obulation.
+
** Corpora lutea are unresponsive to PGF2α until 12-23 days after ovulation.
 
** During luteolysis, corpora lutea are invaded by macrophages.
 
** During luteolysis, corpora lutea are invaded by macrophages.
 
** Macrophages produce Tumour Necrosis Factor (TNF).
 
** Macrophages produce Tumour Necrosis Factor (TNF).
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