- 著者
- Daisuke MIYAKOSHI Hiroyuki SENBA Mitsumori SHIKICHI Masaya MAEDA Ryo SHIBATA Kazuhiro MISUMI
- 出版者
- 日本ウマ科学会
- 雑誌
- Journal of Equine Science (ISSN:13403516)
- 巻号頁・発行日
- vol.27, no.2, pp.67-76, 2016 (Released:2016-06-21)
- 参考文献数
- 14
This study aimed to evaluate the influence of radiographic abnormalities of 2-year-old Thoroughbred horses that were listed at in-training sales in Japan, on whether they started to race or not at 2–3 years of age. Radiographs of 850 2-year-old Thoroughbreds in the in-training sales repository from 2007 to 2010 were reviewed, and 26 categories of radiographic abnormalities were found. Forty-three horses (5.1%, 43/850) did not start a race at 2–3 years of age. In accordance with the racing results for this age category, as determined by Fisher’s exact test and multiple logistic regression analysis, none of the radiographic abnormalities were significantly related to failure to start a race. At 2 years of age, 198 horses (23.3%, 198/850) did not start a race. Horses with enlargement of the proximal sesamoid bones in the fore (9 of 19 horses) and hind limbs (5 of 9 horses) did not start a race at the age of 2 years, and fewer of these horses (fore, P=0.021; hind, P=0.030) started a race at the age of 2 years compared with the population of horses without these radiographic abnormalities. These results suggest that identification of radiographic enlargement of the proximal sesamoid bones during training sales could derail the racing debut of horses at the age of 2 years. However, this might not necessarily indicate a poor prognosis and resulting in retirement from racing at 2–3 years of age.
- 著者
- Tsubono Takaki Kazuhiro Misumi Daisuke Tsumune Michio Aoyama Katsumi Hirose
- 出版者
- 日本地球惑星科学連合
- 雑誌
- 日本地球惑星科学連合2018年大会
- 巻号頁・発行日
- 2018-03-14
We conducted the five ensemble simulation of 137Cs activity in the North Pacific Ocean (NPO) water from 1945 to 2020, before and after the Fukushima Dai-ichi Nuclear Power Plant (1F NPP) accident. We applied the Regional Ocean Model System (ROMS) with variable mesh of 1/12º-1/4º in horizontal, 45 levels in vertical), of which domain was the NPO, to the activity in NPO by using the estimations of 137Cs activity flux such as the atmospheric deposition due to the atmospheric nuclear weapon test from 1945 to 2020 and the atmospheric deposition and the direct release due to 1F NPP accident from 2011 to 2020, but climatology as physical forcing in the whole time. The calculations show almost comparable to the 137Cs activities from 2011 to 2014 in the area that was increased or not increased by the impact of the accident. That suggested that this model reproduced the observed 137Cs activities reasonably from 1945 to 2014.The model showed the largest inventory (290 PBq) of the 137Cs activity in the NPO recorded in 1966, because the largest fallout occurred around 1963 due to the atmospheric nuclear weapon test. The inventory has gradually decreased to about 60PBq by January 2011 because of the half-life and the outflow through the boundaries of the NPO, while hardly showing impact of the Chernobyl accident. The Inventory rapidly increased to 76PBq of which 34PBq existed in surface layer (0 - 200m depth) and 31PBq in central layer (200m - 600m depth) after the accident in April 2011 and then decreased to 56PBq of which 19PBq in the surface layer and 27PBq in the central layer in 2020. The actual half-life, including the radioactive half-life, the transport between the layers and the outflow from the domain, of the inventory was calculated before and after the accident. While the inventory showed same the actual half-life of about 20 years before and after the accident, the half-life of the total amount in the surface decreased from 14 years before the accident to 12 years after the accident and that in the central layer increased from 19 years to 33years. This result showed that the decrease in the total amount in surface is mainly because of the transport from the surface to the central layer after the accident.