Hanper ewes that were either monotocous or polytocous provided ovarian follicles of diameter >3 mm in the follicular phase and, in the luteal phase, samples of corpora lutea that had developed from follicles of diameter >3 mm. Differentially expressed mRNAs (monotocous versus polytocous) were then identified, and their functions were predicted. Results showed that 1508 mRNAs were differentially expressed in the follicular phase, with 885 being in the luteal tissues. Those which were differentially expressed in the follicular phase were mainly involved in the regulation of the ferroptosis and lysosome signalling pathways, whereas, for the luteal tissue, the differentially expressed mRNAs were mainly involved in the regulation of steroid biosynthesis. Based on the results, it was inferred that these pathways could explain variations in the fecundity of sheep.
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