著者

Akira MATSUI Yoshinobu INOUE Yo ASAI Akira YAMANOBE

出版者

Japanese Society of Equine Science

雑誌

Journal of Equine Science (ISSN:13403516)

巻号頁・発行日

vol.16, no.1, pp.19-26, 2005 (Released:2005-04-21)

参考文献数

21

被引用文献数

1 3

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Different geographic regions in which thoroughbred yearling horses are bred have different climates and different types of forage in pasture and hay. These factors are likely to influence the energy metabolism and growth rate of yearling horses. However, the effects of the characteristics of geographic regions on the digestible energy (DE) intake and growth rate of thoroughbred yearlings has yet to be clarified in detail. Here, we have examined the effect of the breeding region on growth performance of young horses, by comparing the DE intakes and growth rates of thoroughbred yearlings in Hidaka (Hokkaido) and Miyazaki (Southern Kyushu) in Japan. Eighteen male thoroughbred yearlings were divided equally into two groups, and bred either at the Hidaka training and research center (HYF) or the Miyazaki yearling farm (MYF). Measurements were conducted in September (summer) and in February (winter), and the mean ages of the yearlings during these two periods were 18 months and 23-24 months old, respectively. The apparent digestible energy intake was measured by a double-indicator method using Cr2O3 and lignin. There was no significant difference in the DE intakes between the yearling horses at the HYF and MYF in either season. The warm land of Southwest Japan has been considered to be unsuitable for growing forage containing sufficient nutrients to feed thoroughbreds, but no nutritional disadvantage of this forage was detected in the yearlings bred at the MYF. On the other hand, the heart girth (HG) and cannon circumference (CC) were found to be significantly smaller in yearlings at the HYF, compared to those at the MYF, in the winter evaluation (p<0.05). Significant positive correlations between the ADG and DE intake/100 kg body weight were seen in animals at the HYF in the summer and in those at the MYF in both seasons; however, such a correlation was not found in horses at the HYF in winter. The reason for the smaller HG and CC and the absence of a significant correlation between the ADG and DE intake/100 kg body weight in the yearlings at the HYF in winter is unclear. It could be attributable to growth delay due to exposure to cold temperatures, or lack of supplementation to compensate for the increased energy requirement due to excess energy metabolism in cold weather. Closer attention must, therefore, be paid to the energy supply and nutritional composition of feedstuffs fed to thoroughbred yearlings at farms in regions with cold ambient temperatures.

著者

Yugo Suzuki Shinji Ito Kosuke Nomura Akira Matsui Daisuke Kikuchi Shu Hoteya

出版者

The Japanese Society of Internal Medicine

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

pp.0673-22, (Released:2022-09-28)

参考文献数

30

被引用文献数

3

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Epstein-Barr virus-associated gastric cancer (EBVaGC) has been reported to be associated with chronic inflammation of the gastric epithelium caused by Helicobacter pylori infection. Autoimmune gastritis (AIG) is also believed to increase the risk of carcinogenesis. We herein report a case of multiple EBVaGCs that arose in a patient with AIG, highlighting the potential for multiplicity of this entity. In this case, a total of four metachronous EBVaGCs were found after initial Endoscopic submucosal dissection for EBVaGC, all of which were treated endoscopically. This case demonstrates that patients with AIG should be monitored closely for development of EBVaGC.

著者

Hajime OHMURA Kazutaka MUKAI Akira MATSUI Toshiyuki TAKAHASHI James H. JONES

出版者

Japanese Society of Equine Science

雑誌

Journal of Equine Science (ISSN:13403516)

巻号頁・発行日

vol.31, no.4, pp.67-73, 2020 (Released:2020-12-18)

参考文献数

23

被引用文献数

4

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Supramaximal exercise while inspiring different O2 gases may induce different responses in cardiopulmonary function at the same relative and/or absolute exercise intensity. The purpose of this study was to compare the effects of supramaximal exercise in hypoxia, normoxia and hyperoxia on cardiopulmonary function in Thoroughbred horses. Using a crossover design, five well-trained horses were made to run up a 6% grade on a treadmill at supramaximal speeds sustainable for approximately 110 sec (approximately 115% VO2max) while breathing normoxic gas (NO, 21% O2) or hypoxic gas (LO, 15.3% O2) in random order. Horses also ran at the same speed, incline and run time as in NO while breathing hyperoxic gas (HONO, 28.8% O2) and as in LO while breathing normoxic gas (NOLO). Runs were on different days, and cardiopulmonary variables were analyzed with repeated-measures ANOVA and the Holm-Šidák method for pairwise comparisons. Supramaximal speeds differed significantly between NO and LO (14.0 ± 0.5 [SD] m/sec vs. 12.6 ± 0.5 m/sec), but run times to exhaustion did not (112 ± 17 sec vs. 103 ± 14 sec). The VO2max in NO was higher than that in LO (165 ± 11 vs. 120 ± 15 ml (min× kg)), as was the arterial oxygen tension (66 ± 5 vs. 45 ± 2 Torr). Oxygen consumption was increased in HONO and NOLO compared with the values in NO and LO, respectively. Supramaximal exercise in hypoxia induces more severe hypoxemia and decreases VO2max compared with normoxia at the same relative intensity. Conversely, supramaximal exercise in hyperoxia alleviates hypoxemia and increases VO2 compared with normoxia at the same absolute intensity.

著者

Akira MATSUI Tomoko OSAWA Hirofumi FUJIKAWA Yo ASAI Tohru MATSUI Hideo YANO

出版者

Japanese Society of Equine Science

雑誌

Journal of Equine Science (ISSN:13403516)

巻号頁・発行日

vol.13, no.4, pp.109-112, 2002 (Released:2003-04-10)

参考文献数

13

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We examined total sweating rate (SR) and the amount of mineral (Na, K, Ca, Mg, Fe, P, Zn and Cu) loss through sweat in 2-year-old horses during exercise for approximately 2,000 m at a speed of 700 m/min, at cool ambient temperature. The total SR was estimated by the unit area SR on the neck by filter paper within a capsule. Mean total SR was 1.55 ± 0.47 (SD) kg. The ratio of sodium loss to the requirements reported by National Research Council reached 23% and that of potassium was 7%. The ratio of other mineral losses to the requirements reported by National Research Council was 2% or less. These results suggested that sodium had to be supplemented to the horse, but there was no need to add extra minerals to the diet to compensate for mineral losses of calcium, magnesium, iron, phosphorus, zinc and copper through sweat during exercise with light intensity and at a cool ambient temperature.

著者

Toshiyuki TAKAHASHI Akira MATSUI Kazutaka MUKAI Hajime OHMURA Atsushi HIRAGA Hiroko AIDA

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.25, no.4, pp.73-77, 2014 (Released:2014-12-15)

参考文献数

15

被引用文献数

4

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It is important to know the effects of the inclination of a slope on the activity of each muscle, because training by running on a sloped track is commonly used for Thoroughbred racehorses. The effects of incline (from −6 to +6%) on the forelimbs and hind limbs during walking and trotting on a treadmill were evaluated by an integrated electromyogram (iEMG). The muscle activities in the forelimbs (5 horses) and hind limbs (4 horses) were measured separately. Two stainless steel wires were inserted into each of the brachiocephalicus (Bc), biceps brachii (BB), splenius (Sp), and pectoralis descendens (PD) in the forelimb experiment and into the longissimus dorsi (LD), vastus lateralis (VL), gluteus medius (GM), and biceps femoris (BF) in the hind limb experiment. The EMG recordings were taken at a sampling rate of 1,000 Hz. At a walk, the iEMG values for the forelimb were not significantly different under any of the inclinations. In the hind limb, the iEMG values for the GM and BF significantly decreased as the inclination decreased. At a trot, the iEMG values for the Bc in the forelimb significantly decreased as the inclination of the treadmill decreased. In the hind limb, the iEMG values for the LD, GM, and BF significantly decreased as the inclination decreased. Uphill exercise increased the iEMG values for the Bc, LD, GM, and BF, while downhill exercise resulted in little increase in the iEMG values. It was concluded that the effects of inclination on the muscle activities were larger for the uphill exercises, and for the hind limb muscles compared with the forelimb muscles.

著者

Tomoaki ONODA Ryuta YAMAMOTO Kyohei SAWAMURA Harutaka MURASE Yasuo NAMBO Yoshinobu INOUE Akira MATSUI Takeshi MIYAKE Nobuhiro HIRAI

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.25, no.2, pp.29-35, 2014 (Released:2014-06-25)

参考文献数

17

被引用文献数

4

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We propose an approach of estimating individual growth curves based on the birthday information of Japanese Thoroughbred horses, with considerations of the seasonal compensatory growth that is a typical characteristic of seasonal breeding animals. The compensatory growth patterns appear during only the winter and spring seasons in the life of growing horses, and the meeting point between winter and spring depends on the birthday of each horse. We previously developed new growth curve equations for Japanese Thoroughbreds adjusting for compensatory growth. Based on the equations, a parameter denoting the birthday information was added for the modeling of the individual growth curves for each horse by shifting the meeting points in the compensatory growth periods. A total of 5,594 and 5,680 body weight and age measurements of Thoroughbred colts and fillies, respectively, and 3,770 withers height and age measurements of both sexes were used in the analyses. The results of predicted error difference and Akaike Information Criterion showed that the individual growth curves using birthday information better fit to the body weight and withers height data than not using them. The individual growth curve for each horse would be a useful tool for the feeding managements of young Japanese Thoroughbreds in compensatory growth periods.