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Affiliation |
Faculty of Agriculture Region of Veterinary Science |
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Title |
Professor |
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External Link |
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Related SDGs |
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SATO REIICHIRO
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Degree 【 display / non-display 】
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博士（獣医学） ( 2013.12 麻布大学 )
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学士（獣医学） ( 2004.3 麻布大学 )
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学士（農学） ( 1998.3 鹿児島大学 )
Research Interests 【 display / non-display 】
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calcium metabolism
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soft tissue surgery
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periparturient disease
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umbilical disease
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oxidative stress
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骨代謝
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周産期疾患
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cattle
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腹腔鏡
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ruminant
Research Areas 【 display / non-display 】
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Life Science / Veterinary medical science
Campus Career 【 display / non-display 】
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University of Miyazaki Faculty of Agriculture Region of Veterinary Science Professor
2025.04 - Now
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University of Miyazaki Faculty of Agriculture Department of Veterinary Science
2022.04 - 2024.03
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University of Miyazaki Graduate School of Medicine and Veterinary Medicine A Professor
2020.04 - Now
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University of Miyazaki Faculty of Agriculture Department of Veterinary Science Faculty of Agriculture Department of Veterinary Sciences Professor
2020.04 - 2025.03
External Career 【 display / non-display 】
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Universität Bern Visiting Professor
2023.4
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Meiji University
2021.4
Professional Memberships 【 display / non-display 】
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九州沖縄産業動物臨床研究会
2021.1
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護蹄研究会
2016.6 - 2019.9
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国際蹄病学会
2016.5 - 2019.9
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動物臨床医学会
2015.11
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日本家畜臨床学会
2015.4
Papers 【 display / non-display 】
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Kabir M.H.B., Murakoshi F., Fukuda Y., Itoh M., Kano Y., Sato R., Otomaru K., Fujikura A., Endo T., Yamamura F., Goto A., Shibano K., Mochizuki N., Fumiaki Takahashi , Yosuke Maeda , Miura H., Bandai K., Kato K.
Parasitology Research 125 ( 1 ) 21 2026.12
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Parasitology Research
Calf diarrhea is a multifactorial disease that poses substantial challenges to the cattle industry, necessitating timely identification and characterization of causative agents to inform effective control strategies. This study investigated the prevalence, co-occurrence, and characteristics of Cryptosporidium and Eimeria infections in diarrheic calves. A total of 348 diarrheal fecal samples were collected from calves aged 1–30 days across 15 prefectures in Japan between February 2020 and February 2022. Preliminary diagnosis of calf diarrhea was performed using an immunochromatographic test (ICT) kit. Cryptosporidium spp. were detected in 36.5% (127/348) of samples. Using nested PCR and conventional PCR with species-specific primers, targeting these two major parasitic pathogens, we assessed seasonal variations, prevalence, and associations with calf age, breed, and sex. Overall, Cryptosporidium was detected in 58.6% of samples, while Eimeria spp. were found in 7.5%. Mixed infections involving both pathogens occurred in 4.9% of samples. The highest detection rates for both pathogens were observed in calves aged 8–15 days, with a significant age-related decline in mixed infections (p < 0.05). Seasonal variations were observed, with distinct prevalence patterns for each pathogen. Breed- and sex-related differences were minimal but are described in detail. Phylogenetic analysis confirmed C. parvum as the predominant Cryptosporidium species and E. bovis as the most common Eimeria species. These findings highlight the widespread presence of Cryptosporidium and Eimeria spp. in diarrheic calves in Japan and provide insights into age- and season-related infection dynamics, informing targeted control and management strategies.
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Kajisa M., Tani C., Tani M., Li J., Ito S., Yamauchi T., Murakami H., Katamoto H., Sato R., Nakahata S.
Veterinary Record Open 13 ( 1 ) e70029 2026.6
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Veterinary Record Open
Background: Bovine leukaemia virus (BLV) infection remains a major problem for Japanese Black (Wagyu) cattle, and effective and sustainable control measures are essential to prevent its spread in breeding herds. This study aimed to monitor the BLV infection status of all cattle at a Japanese Black breeding farm in Kagoshima Prefecture, Japan, over 7 years. Methods: BLV serological testing was conducted at baseline in 2018 (Y0, study year 0), followed by real-time polymerase chain reaction (PCR) testing in six survey years between 2019 and 2024 (Y1‒Y6; no testing in 2023). The infection status and proviral load (PVL) were assessed. Cattle were classified as calves (<10 months) or breeding cattle (≥10 months), reflecting standard Japanese production practices. After high-PVL cattle were identified in Y1, new barns were constructed stepwise from Y2 onwards to physically separate BLV-positive and BLV-negative animals. In addition, strategic culling of BLV-positive cattle, BLV screening of introduced cattle, and early separation of calves from their dams were implemented. Results: At Y0, BLV seroprevalence among breeding cattle was 78.6%. At Y1, PCR detected BLV in 28.0% of calves and 74.1% of breeding cattle. By Y6, BLV prevalence had significantly decreased to 39.2% in breeding cattle compared with Y1, while it was 21.6% in calves, with no significant reduction observed. Conclusions: Early identification of high-PVL cattle, physical separation of BLV-positive and BLV-negative cattle, and culling of BLV-positive cattle was effective in reducing BLV prevalence in a Wagyu breeding herd. These findings propose a feasible, farm-based approach for managing endemic BLV under commercial conditions.
DOI： 10.1002/vro2.70029
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佐藤 礼一郎
Animals 15 ( 18 ) 2638 2025.9
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG
Oxidative stress is a detrimental factor affecting pig reproductive performance but has rarely been evaluated in clinical fields. We evaluated the potential of diacron-reactive oxygen metabolites (d-ROMs) and biological antioxidant potential (BAP) as stable markers for assessing oxidative stress in breeding sows. The 28 sows were categorized into a low-parity group (n = 18, parity 1-2) and a high-parity group (n = 10, parity 4-6) at two commercial farms. Blood samples were collected at three stages: farrowing, weaning, and early pregnancy. At each stage, the levels of oxidative stress markers and reproductive performance parameters were statistically analyzed. The findings revealed that heightened levels of oxidative stress in sows at farrowing have negative effects on the total number of piglets at subsequent farrowing. Moreover, the farm employing a group management system demonstrated a superior total number of piglets on subsequent farrowing compared with the farm utilizing individual stall-based management. This study shows that oxidative stress can be evaluated using d-ROMs and BAP, which are associated with reproductive score. Using these parameters, the current oxidative status of sows can be evaluated, allowing for the development of countermeasures to reduce oxidative stress, which in turn may contribute to improved productivity in swine production systems.
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Infectious endophthalmitis associated with umbilical infection in Japanese black calf: a case report Reviewed
佐藤 礼一郎, 井口 純, 上村 涼子
Frontiers in Veterinary Science 12 2025.4
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Frontiers Media SA
A 3-day-old Japanese black calf presented with a swollen and tender umbilical cord and diffusely cloudy and keratoconus eyes. Abdominal ultrasonography confirmed mild enlargement of both umbilical arteries and the urachus with a hyperechoic lumen. Additionally, a hyperechogenic structure suggestive of pus was noted near the abdominal wall. Fluorescein staining revealed corneal epithelial injury, whereas slit lamp examination identified corneal edema, increased corneal thickness, and keratitis with vascularization of the corneal stroma. Based on these findings, diagnoses of omphaloarteritis, omphalourachitis, and bullous keratitis were made. Both umbilical arteries and the urachus were surgically removed; both ocular globes were covered with a third eyelid flap, which was released 30 days postoperatively. On the follow-up, ocular ultrasonography indicated bleeding or fibrin deposits in the vitreous body of the right ocular globe. Because intraocular inflammation was suspected, anterior aqueous humor was collected from the right ocular globe, and bacterial examination was performed with the umbilical artery abscess, urachal abscess, and intraabdominal pus collected intraoperatively. Escherichia coli was isolated from the umbilical artery abscess, urachal abscess, intraabdominal pus, and aqueous humor, and all isolates exhibited identical genotypes. These findings suggest that endophthalmitis occurred as a result of the hematogenous spread of bacteria originating from septic umbilical cord remnants and that ocular ultrasonography is useful for assessing intraocular pathologies.
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The effect of heat and cold stress on oxidative stress of follicular microenvironment in beef cattle Reviewed
KANADA Kodai, ELGENDY Omnia, HEMMI Koichiro, KOBAYASHI Ikuo, SATO Reiichiro, OSAWA Takeshi, KITAHARA Go
Journal of Veterinary Medical Science 87 ( 11 ) 1336 - 1345 2025
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：JAPANESE SOCIETY OF VETERINARY SCIENCE
This study hypothesized that heat and cold stress affect the balance between oxidants and antioxidants (oxidative stress) of oocytes and follicular fluid (FF) in beef cattle and the oxidative stress between blood and FF is correlated. Thirty-two Japanese Black cattle that were divided into four seasonal groups [fall, winter (WG), spring (SpG), and summer (SmG) group]. Plasma and FF were measured diacron-reactive oxygen metabolites (d-ROMs), biological antioxidant potential (BAP), and oxidative stress index (OSI). Reactive oxygen species (ROS) were measured in oocytes. Temperature-humidity index was lower in WG and higher in SmG than in the other three groups (<i>P</i><0.05). d-ROMs value was lower in FF than in plasma in all groups, BAP value was lower in FF than in plasma in WG, SpG, and SmG, and OSI was lower in FF than in plasma in WG and SpG (<i>P</i><0.05). In FF, d-ROMs and BAP values were positively correlated in WG, SpG, and heifer groups (HG, <i>P</i><0.05). d-ROMs or OSI values between plasma and FF were positively correlated in all animals and cow group (CG), SpG, CG, and HG (<i>P</i><0.05). ROS levels in oocytes were higher in WG and SpG than in SmG (<i>P</i><0.05). In conclusion, oxidative stress in the blood and FF are linked, and oxidative stress of oocytes increases in winter and spring in beef cattle that are kept on pasture, except in winter.
DOI： 10.1292/jvms.24-0323
Books 【 display / non-display 】
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牛の臨床外科
佐藤礼一郎ほか（ Role： Supervisor (editorial)）
緑書房 2025.3
Language：Japanese Book type：Textbook, survey, introduction
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獣医内科学 第3版
佐藤 礼一郎（ Role： Contributor , 第5章 肝臓・胆道・膵外分泌疾患）
文栄堂 2022
Language：Japanese Book type：Scholarly book
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新しい子牛の科学
家畜感染症学会（ Role： Contributor）
緑書房 2021.3
Language：Japanese Book type：Scholarly book
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新・主要症状を基礎とした牛の臨床
小岩政照，田島誉士 他（ Role： Joint author）
デーリィマン社 2020.5
Language：Japanese Book type：Scholarly book
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獣医臨床薬理学
下田実，堀正敏 他（ Role： Joint author）
近代出版 2017.12
Total pages：236 Language：Japanese Book type：Textbook, survey, introduction
MISC 【 display / non-display 】
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黒毛和種子牛の類皮嚢腫 Invited
佐藤 礼一郎
臨床獣医 12 6 - 11 2026.12
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
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二次診療機関（大学）と産業動物臨床現場をつなぐ遠隔診療 Invited
佐藤礼一郎
日本獣医師会雑誌 78 516 - 520 2026.12
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
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牛の帝王切開時における保定体位、切開部位の選択および子宮縫合法 Invited
佐藤礼一郎，中尾茂
家畜診療 72 ( 9 ) 507 - 514 2025.9
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
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骨折牛を搬送する際の注意点
佐藤 礼一郎
家畜診療 71 ( 8 ) 495 - 497 2024.8
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Rapid communication, short report, research note, etc. (scientific journal)
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黒毛和種繁殖牛におけるControl Internal Drug Releasing Device (CIDR)の誤食
佐藤 礼一郎
臨床獣医 ( 5 ) 6 - 9 2024.5
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Rapid communication, short report, research note, etc. (scientific journal)
Presentations 【 display / non-display 】
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牛の軟部外科と帝王切開
佐藤礼一郎
産業動物獣医師会研修会 2026.2.20
Event date： 2026.2.20
Language：Japanese Presentation type：Oral presentation (general)
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子牛の臍部疾患
佐藤礼一郎
指導級認定牛削蹄師資格者昇級研修会 2026.2.3
Event date： 2026.2.3
Language：Japanese Presentation type：Oral presentation (general)
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乳牛の疾病および護蹄管理 Invited
佐藤礼一郎
日本獣医師会 農場管理認定獣医師育成のための高度・実践的研修会（乳牛編） 2025.12.5
Event date： 2025.12.5
Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech
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臍炎（臍帯炎）の病態 Invited
佐藤 礼一郎
第45回動物臨床医学会年次大会 2025.10.19
Event date： 2025.10.19
Language：Japanese Presentation type：Oral presentation (general)
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宮崎大学の産業動物臨床分野におけるVR教材の活用 Invited
佐藤礼一郎
第168回日本獣医学会学術集会 2025.9
Event date： 2025.9
Language：Japanese Presentation type：Oral presentation (general)
Industrial property rights 【 display / non-display 】
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参加型獣医学・畜産学教育のための動物模型の開発
佐藤 礼一郎
Application no：000000 Date applied：2017.5.19
Announcement no： 第6143256号 Date announced：2017.5.19
Awards 【 display / non-display 】
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Good Reviewer Award
2025.9 日本獣医学会
佐藤礼一郎
Award type：Award from Japanese society, conference, symposium, etc.
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宮崎大学農学部地域貢献優秀賞
2024.12 宮崎大学農学部 産業動物における衛生的かつ術者ならびに動物双方に優しい手術環境の構築ポータブルエア手術台－ここでもオペ－
佐藤礼一郎
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優秀賞
2023.12 家畜衛生学会 牛伝染性リンパ腫ウイルス野生株の伝播性解析
佐藤礼一郎
Award type：Award from Japanese society, conference, symposium, etc.
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地区学術奨励賞
2023.10 産業動物獣医学会 臍部疾患の関与が疑われた炎症性眼疾患を発症した黒毛和種子牛
佐藤礼一郎
Award type：Award from Japanese society, conference, symposium, etc.
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Good Reviewer Award
2023.9 日本獣医学会
佐藤礼一郎
Award type：International academic award (Japan or overseas)
Grant-in-Aid for Scientific Research 【 display / non-display 】
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非妊娠豚を用いた人為的初乳作出法の開発
Grant number：16K18785 2016.04 - 2018.03
科学研究費補助金 若手研究(B)
Authorship：Coinvestigator(s)
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ウシ乳腺組織で産生される副甲状腺ホルモン関連タンパク質と低カルシウム血症の関
Grant number：25450457 2013.04 - 2015.03
科学研究費補助金 基盤研究(C)
Authorship：Coinvestigator(s)
Available Technology 【 display / non-display 】
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牛の臍部・臍帯感染症および中耳炎の診断法、治療法に関する研究
産業動物の酸化ストレスに関する研究
産業動物における周産期疾患の治療および予防に関する研究Message：【共同研究テーマ】
・臍部感染症や中耳炎の治療法の開発・産業動物における硬性鏡等を用いた低侵襲性手術法の開発・産業動物獣医療に関することであればそれ以外でも応相談
Committee Memberships 【 display / non-display 】
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農林水産省 食料・農業・農村政策審議会専門委員（座長）
2025.4 - 2025.12
Committee type：政府
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護蹄研究会 （ 理事
2024.4
Committee type：学協会
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家畜感染症学会 評議委員
2024.4
Committee type：学協会
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NPO法人獣医学教育支援機構 理事
2023.4
Committee type：学協会
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NPO法人獣医学教育支援 vetOSCE委員会 副委員長
2023.4
Committee type：学協会