Fertility risk factors in transferring Japanese Black embryos into dairy heifers: An epidemiological study
| Autor: | Ken Nakada, Motozumi Matsui, Shingo Haneda, Koh Hayama, Ken Hazano, Yrjö T. Gröhn, Yoshio Oono, M. Urakawa, Akira Goto, Mitsunori Kayano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
animal structures media_common.quotation_subject Veterinary medicine Japanese black Fertility Beef cattle Biology Article Animal science Epidemiology Fertility risk SF600-1100 medicine media_common General Veterinary Embryo Embryo transfer Bloodline Breed Reproductive epidemiology embryonic structures Animal Science and Zoology Embryo quality |
| Zdroj: | Veterinary and Animal Science, Vol 13, Iss, Pp 100193-(2021) Veterinary and Animal Science |
| Popis: | Highlights • Epidemiological study of embryo transfers of japanese black (JB) embryos. • JB's bloodline combination was also found to be a risk factor for embryo fertility. • Success of JB embryo transfer may depend on differences in genetic background. 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 environment (year and season of transfer), recipient (age, number of transfers, clinical status of the ovaries) and embryo (quality, stage, state, genetic background). We used data from 4467 JB fresh or frozen embryo transfers into Holstein heifers conducted by Zen-noh Embryo Transfer Center during 2016–2018, and the differences in fertility risk due to factors related to the environment, recipient, and embryo were statistically evaluated. Differences in fertility risk due to each variable were observed, leading to significant differences in fertility with respect to year of transfer, embryo quality, embryo state, and embryo breed. These results suggest that the fertility of JB embryos might depend on differences in genetic background. There have been no previous reports of differences in embryo fertility due to the differences among JB's bloodline combinations. In the future, overall reproductive efficiency must be monitored, including the effects of different bloodline combinations on the success of embryo recovery and transfer. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|