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Relationship among ovarian follicular status, developmental competence of oocytes, and anti‐Müllerian hormone levels: A comparative study in Japanese wild boar crossbred gilts and Large White gilts
Author(s) -
Tanihara Fuminori,
Hirata Maki,
Iizuka Satoru,
Sairiki Shinya,
Nii Masahiro,
Nguyen Nhien Thi,
Le Quynh Anh,
Hirano Takayuki,
Otoi Takeshige
Publication year - 2019
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.13200
Subject(s) - biology , anti müllerian hormone , follicular phase , andrology , crossbreed , breed , embryo , boar , antral follicle , large white , medicine , endocrinology , hormone , zoology , semen , anatomy , genetics
The aim of this study was to investigate the ovarian follicular development, developmental competence of oocytes, and plasma anti‐Müllerian hormone (AMH) levels of Japanese wild boar crossbred (wild hybrid) gilts, whose litter size is inferior to that of European breeds. Ovary and plasma samples were collected from two different breeds of gilts (wild hybrid and Large White breeds). The ovaries from the wild hybrid gilts had a lower average numbers of secondary follicles and vesicular follicles in ovarian cross‐sections and of good quality oocytes collected from ovarian follicles as compared with those from Large White gilts ( p < 0.05). The development rate to the blastocyst stage of good quality oocytes after in vitro maturation, fertilization and culture was also lower ( p < 0.05) in wild hybrid gilts than in Large White gilts. Plasma AMH levels with >0.16 ng/ml were detected in 8.3% of the examined wild hybrid gilts and 33% of the Large White gilts. These results indicate that the low reproductive performance of wild hybrid breed may result in part from low numbers of vesicular follicles and good quality oocytes, and low developmental competence of oocytes. Moreover, plasma AMH levels may support low number of vesicular follicles in ovaries of wild hybrid gilts.