Ken Hazano

58 Identification of the developmental kinetics involved in the fertility of bovine OPU-IVP embryos

Fumie Magata, H. Tsukahara, Ken Hazano, Rui Obinata et autres

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Timing of human chorionic gonadotropin administration affects conception rates after embryo transfer in crossbred beef heifers

Ken Hazano, Akira Gotō, Shingo Haneda, Motozumi Matsui

This study aimed to determine the effect of the timing of human chorionic gonadotropin (hCG) administration to embryo transfer (ET) recipients on the reproductive outcome of ET in crossbred beef heifers. Heifers (n=1,887) were randomly assigned to the non-treatment group (n=1,160), and …

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90 Effect of sediment from spontaneously immortalized oviduct epithelial cells on the development and fertility of bovine OPU-IVF embryos

Hirokazu Tsukahara, Norikazu Miyashita, Y. Hirao, Rui Obinata et autres

Reproduction, Fertility and Development is an international journal publishing original research , review and comment in the fields of reproduction and developmental biology in humans, domestic animals and wildlife

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Fertility risk factors in transferring Japanese Black embryos into dairy heifers: An epidemiological study

Akira Gotō, K. Hayama, M. Urakawa, Y. Oono et autres

The aims of this study were 1) to summarize the current status of Japanese Black (JB) embryo transfer into Holstein heifers, which is carried out on a commercial basis in Japan, and 2) to reveal fertility risk factors, including those from the …

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Effects of the formation and regression of accessory corpus lutea during pregnancy on plasma progesterone concentration and pregnancy status in cross-bred beef heifers

Ken Hazano, Takafumi Miki, Akira Gotō, Mitsunori Kayano et autres

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Sustained high progesterone concentrations during estradiol-progesterone based estrus synchronization protocol in Japanese Black cows affects fertility by influencing preovulatory follicle size and its ovulation

Daisaku Ueno, Akira Gotō, Ken Hazano, Shingo Haneda et autres

2,3)

Associations between plasma testosterone levels and season, nutritional status, age, and body size in free-ranging male Asian black bears (Ursus thibetanus) in central Honshu, Japan

Jumpei Tomiyasu, Mitsunori Kayano, Ken Hazano, Motozumi Matsui et autres

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Local sex steroid hormone milieu in the bovine oviduct ipsilateral and contralateral to preovulatory follicle or corpus luteum during the periovulatory phase

Ken Hazano, Shingo Haneda, Mitsunori Kayano, Motozumi Matsui

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Effects of hCG administration on corpus luteum development and plasma sex steroid hormone concentration in beef heifers differ according to the locational relationships of the original corpus luteum and the first-wave dominant follicle

Ken Hazano, Shingo Haneda, Mitsunori Kayano, Ryotaro Miura et autres

The aims of this study were to compare the effects of an intramuscular human chorionic gonadotropin (hCG) administration on corpus luteum (CL) development, plasma progesterone (P4) and estradiol (E2) concentration in ipsilateral (first-wave dominant follicle [W1DF] in the same ovary as the …

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103 Effects of administration of human chorionic gonadotrophin at Day 5 post-ovulation on development of the original corpus luteum depend on the locational relationship between the original and accessory corpora lutea

Ken Hazano, Shingo Haneda, Motozumi Matsui

In cattle, human chorionic gonadotrophin (hCG) is administered at Day 5 post-ovulation to improve fertility. This treatment can induce ovulation of the first-wave dominant follicle (W1DF), from which an accessory corpus luteum (CL) is generated. In addition, hCG has the effect of …

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Possible roles of local oviductal estradiol-17β in luteal formation phase on the function of bovine oviductal epithelium

Ken Hazano, Shingo Haneda, Mitsunori Kayano, Motozumi Matsui

Oviducts play an important role in the reproductive process, such as in gamete transport, fertilization, and early embryonic development. However, the regulation of oviductal function during luteal formation phase (3-5 days post-ovulation), which is a crucial phase for early embryonic development, remains …

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