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Effect of presence of corpora lutea on cumulus expansion of in vitro matured bovine oocytes selected by trypan blue and brilliant cresyl blue tests


Effect of presence of corpora lutea on cumulus expansion of in vitro matured bovine oocytes selected by trypan blue and brilliant cresyl blue tests



Journal of Applied Animal Research 46(1): 967-972



ISSN/ISBN: 0971-2119

DOI: 10.1080/09712119.2018.1440566

Trypan Blue (TB) and Brilliant Cresyl Blue (BCB) are used to select and deternline viability and competer) of oocytes, however, the effects of corpora lutea on cumulus expansion during in vitro maturation are still undeternlined. Cuniulus-oocytes complexes (COCs) from ovaries with ipsilateral(ICL), contralateral (CCL) and without corpora lutea in either ovary (OCL) were selected by visual examination, TB and BCB staining, and matured in vitro to evaluate cumulus expansion. The overall percentage of visually selected COCs was similar in ICL, CCL and OCL (P>0.05). Proportions of live and mature COCs were similar in all groups (P>0.05). The overall percentage of BCB+ COCs was 70.1%. BCB+ ICL COCs had less cumulus expansion 60.5%) than BCB+ CCL and OCL COCs (75.7 and 71.4%, respectively; P < 0.01). BCB ICL COCs had less cumulus expansion (20.0%) than BCB- CCL and OCL (39.7 and 46.1%; P<0.01). BCB+ CCL and OCL COCs showed the highest cumulus expansion index (PG 0.01). Presence of corpus luteum in the ovary affects negatively cumulus cells expansion. TB and BCB staining facilitate the selection of oocytes with higher degrees of cumulus expansion.

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Accession: 070873517

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