| Aging-related changes in in vitro-matured bovine oocytes: oxidative stress, mitochondrial activity and ATP content after nuclear maturation K Koyama, SS Kang, W Huang, Y Yanagawa, Y Takahashi, M Nagano Journal of Reproduction and Development 60 (2), 136-142, 2014 | 58 | 2014 |
| Addition of D-penicillamine, hypotaurine, and epinephrine (PHE) mixture to IVF medium maintains motility and longevity of bovine sperm and enhances stable production of … SS Kang, K Koyama, W Huang, Y Yang, Y Yanagawa, Y Takahashi, ... Journal of Reproduction and Development 61 (2), 99-105, 2015 | 44 | 2015 |
| Prediction of calving time in Holstein dairy cows by monitoring the ventral tail base surface temperature K Koyama, T Koyama, M Sugimoto, N Kusakari, R Miura, K Yoshioka, ... The Veterinary Journal 240, 1-5, 2018 | 40 | 2018 |
| In vitro maturation system for individual culture of bovine oocytes using micro-volume multi-well plate M Nagano, SS Kang, K Koyama, W Huang, Y Yanagawa, Y Takahashi Japanese Journal of Veterinary Research 61 (4), 149-154, 2013 | 35 | 2013 |
| Enhancement of maternal recognition of pregnancy with parthenogenetic embryos in bovine embryo transfer H Hirayama, S Moriyasu, S Kageyama, K Sawai, H Takahashi, M Geshi, ... Theriogenology 81 (8), 1108-1115, 2014 | 29 | 2014 |
| Hot topic: pregnancy-induced expression of interferon-stimulated genes in the cervical and vaginal mucosal membranes H Kunii, K Koyama, T Ito, T Suzuki, AZ Balboula, T Shirozu, H Bai, ... Journal of dairy science 101 (9), 8396-8400, 2018 | 26 | 2018 |
| Calving prediction in dairy cattle based on continuous measurements of ventral tail base skin temperature using supervised machine learning S Higaki, K Koyama, Y Sasaki, K Abe, K Honkawa, Y Horii, T Minamino, ... Journal of dairy science 103 (9), 8535-8540, 2020 | 18 | 2020 |
| Estimation of the optimal timing of fertilization for embryo development of in vitro-matured bovine oocytes based on the times of nuclear maturation and sperm penetration K Koyama, SS Kang, W Huang, Y Yanagawa, Y Takahashi, M Nagano Journal of Veterinary Medical Science 76 (5), 653-659, 2014 | 16 | 2014 |
| Optimization of diagnostic methods and criteria of endometritis for various postpartum days to evaluate infertility in dairy cows T Koyama, R Omori, K Koyama, Y Matsui, M Sugimoto Theriogenology 119, 225-232, 2018 | 14 | 2018 |
| The efficacy of the well of the well (WOW) culture system on development of bovine embryos in a small group and the effect of number of adjacent embryos on their development SS Kang, S Ofuji, K Imai, W Huang, K Koyama, Y Yanagawa, Y Takahashi, ... Zygote 23 (3), 412-415, 2015 | 13 | 2015 |
| Effects of ovarian storage condition on in vitro maturation of Hokkaido sika deer (Cervus nippon yesoensis) oocytes K Tulake, Y Yanagawa, Y Takahashi, S Katagiri, S Higaki, K Koyama, ... Japanese Journal of Veterinary Research 62 (4), 187-192, 2014 | 12 | 2014 |
| Localization of TGF-β and TGF-β receptor in bovine term placentome and expression differences between spontaneous and induced parturition H Hirayama, K Koyama, K Sawai, T Fujii, A Naito, S Fukuda, S Kageyama Placenta 36 (11), 1239-1245, 2015 | 11 | 2015 |
| Repeatability of antral follicle count according parity in dairy cows K Koyama, T Koyama, M Sugimoto Journal of Reproduction and Development 64 (6), 535-539, 2018 | 9 | 2018 |
| Enhanced glucocorticoid exposure facilitates the expression of genes involved in prostaglandin and estrogen syntheses in bovine placentomes at induced parturition T Yasuhara, K Koyama, R Sakumoto, T Fujii, A Naito, S Moriyasu, ... Theriogenology 139, 1-7, 2019 | 7 | 2019 |
| Early germinal vesicle breakdown is a predictor of high preimplantation developmental competent oocytes in mice S Higaki, M Kishi, K Koyama, M Nagano, S Katagiri, T Takada, ... Zygote 25 (1), 41-48, 2017 | 7 | 2017 |
| Expression of C–C motif chemokines and their receptors in bovine placentomes at spontaneous and induced parturition H Hirayama, R Sakumoto, K Koyama, T Yasuhara, T Hasegawa, R Inaba, ... Journal of Reproduction and Development 66 (1), 49-55, 2020 | 5 | 2020 |
| Characteristics of dairy cows with a pronounced reduction in first milk yield after estrus onset. K Koyama, T Koyama, Y Matsui, M Sugimoto, N Kusakari, I Osaka, ... Japanese Journal of Veterinary Research 65 (2), 55-63, 2017 | 4 | 2017 |
| 卵巢运输保存温度和时间对野生梅花鹿卵母细胞体外成熟的影响 库尔班， 吐拉克 新疆农业大学学报 31 (6), 63-66, 2008 | 4 | 2008 |
| Parity affects the relationship between the insemination–ovulation interval and the conception rate in lactating dairy cows K Koyama, T Kubo, T Koyama, Y Takahashi Reproduction in Domestic Animals, 2023 | 3 | 2023 |
| Predicting nuclear maturation speed of oocytes from Japanese Black beef heifers through non-invasive observations during IVM: An attempt using machine learning algorithms TCT Ho, N Kawate, K Koyama Theriogenology 209, 235-242, 2023 | 1 | 2023 |
Shogo HigakiNational Institute of Animal Health, NAROVerified email at affrc.go.jp
