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Your search keyword '"Nagano, Masashi"' showing total 22 results
Start Over Author "Nagano, Masashi" Journal journal of reproduction and development
22 results on '"Nagano, Masashi"'

4. Effect of a single epidural administration of follicle-stimulating hormone via caudal vertebrae on superstimulation for in vivo and in vitro embryo production in Japanese black cows

Author

SAKAGUCHI, Kenichiro, IDETA, Atsushi, YANAGAWA, Yojiro, NAGANO, Masashi, KATAGIRI, Seiji, and KONISHI, Masato

Subjects
Follicle-stimulating hormone (FSH), Oocyte Retrieval, Superovulation, Fertilization in Vitro, Embryo Transfer, Embryo, Mammalian, Ovarian Follicle, Ovulation Induction, Pregnancy, embryonic structures, Ovum-pick up, Animals, Pregnancy, Animal, Cattle, Female, Follicle Stimulating Hormone, Technology Report, Epidural administration, Ovum
Abstract

Advance Publication, Here, we describe a simplified procedure for embryo production in the Japanese black cow that uses a single caudal epidural injection of follicle-stimulating hormone (FSH). First, we compared the efficiency of superovulation for in vivo embryo production between conventional multiple FSH treatment (control, n = 10) and single epidural administration (epidural, n = 5). The number of transferable blastocysts was similar between control and epidural groups (4.7 ± 3.5 and 9.0 ± 6.0, respectively). Next, we compared in vitro embryo production by ovum pick-up and in vitro fertilization (OPU-IVF) between control (n = 12) and epidural groups (n = 12). The rate of development to transferable blastocysts was higher in the epidural group than in the control (23.3 vs. 10.5%, P < 0.001). In conclusion, a single epidural administration of FSH can induce follicular development comparable to that of the conventional superovulation protocol and may improve the productivity of OPU-IVF.

Published
2018

10. Estrous cycle stage-dependent manner of type I interferon-stimulated genes induction in the bovine endometrium

Author

SHIROZU, Takahiro, primary, IWANO, Hiroki, additional, OGISO, Takatoshi, additional, SUZUKI, Toshiyuki, additional, BALBOULA, Ahmed Z., additional, BAI, Hanako, additional, KAWAHARA, Manabu, additional, KIMURA, Koji, additional, TAKAHASHI, Hitomi, additional, RULAN, Bai, additional, KIM, Sung-Woo, additional, YANAGAWA, Yojiro, additional, NAGANO, Masashi, additional, IMAKAWA, Kazuhiko, additional, and TAKAHASHI, Masashi, additional

Published
2017
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14. Accessory corpora lutea formation in pregnant Hokkaido sika deer (Cervus nippon yesoensis) investigated by examination of ovarian dynamics and steroid hormone concentrations

Author

YANAGAWA, Yojiro, primary, MATSUURA, Yukiko, additional, SUZUKI, Masatsugu, additional, SAGA, Shin-ichi, additional, OKUYAMA, Hideto, additional, FUKUI, Daisuke, additional, BANDO, Gen, additional, NAGANO, Masashi, additional, KATAGIRI, Seiji, additional, TAKAHASHI, Yoshiyuki, additional, and TSUBOTA, Toshio, additional

Published
2015
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22. Leptin receptor expression and its change in association with the normalization of EGF profile after seminal plasma treatment in repeat breeder dairy cows.

Author

Ninpetch N, Badrakh D, Hay Mar Kyaw, Kawano K, Yanagawa Y, Nagano M, and Katagiri S

Subjects
Animals, Cattle, Endometrium metabolism, Female, Fertility, Leptin metabolism, Receptors, Leptin genetics, Receptors, Leptin metabolism, Epidermal Growth Factor metabolism, Semen metabolism
Abstract

Factors associated with high milk production levels have been linked to alterations in the endometrial epidermal growth factor (EGF) profile, a cause of reduced fertility in dairy cows. Therefore, we examined the leptin system that connects nutritional status and reproduction in dairy cattle related to reduced fertility in repeat breeder cows. Plasma leptin concentrations were measured in 18 heifers, 20 high-yielding control cows, and 26 repeat breeder cows, showing an altered EGF profile. Then, all repeat breeder cows were infused with seminal plasma (SP) into the vagina at the next estrus to normalize the EGF profile, while heifers and control cows were infused with vehicle alone. All animals were examined for EGF profiles. Eighteen repeat breeder cows, nine heifers, and nine control cows were also determined for leptin receptor (Ob-R) expression levels in the estrous cycle before and after the infusion. SP normalized the EGF profile in 53.8% of the repeat breeder cows. Leptin concentrations were similar in all groups, regardless of the treatment results for the EGF profile. In contrast, Ob-R levels in repeat breeder and control cows were similar and higher than those in heifers before SP treatment. Ob-R in repeat breeders showing a normal EGF profile after treatment decreased to an intermediate level between heifers and control cows and may provide a clue to take measures against repeat breeding in dairy cows.

Published
2022
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