OSAWA Takeshi

写真a

Title

Professor

Date of Birth

1964

Laboratory Address

Miyazaki 889-2192

Research Fields, Keywords

Theriogenology

Degree 【 display / non-display

  • Rakuno Gakuen University -  Doctor (Veterinary Medicine)

  • University of Edinburgh (UK) -  Master of Philosophy

Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display

  • Veterinary medical science

 

Papers 【 display / non-display

  • Intrauterine infusion of povidone-iodine: Its effect on the endometrium and subsequent fertility in postpartum dairy cows

    Rumika Yoshida, Go Kitahara, Takeshi Osawa

    Journal of Veterinary Medical Science     2020.06  [Refereed]

    Joint Work

  • Severe degenerative changes in cryptorchid testes in Japanese Black cattle

    Fuke N, Kitahara G, Ito S, Van Diep N, Ping Teh AP, Izzati UZ, Myint O, Hirai T, Torisu S, Kaneko Y, Sato H, Hidaka Y, Osawa T, Yamaguchi R

    Veterinary Pathology     300985820906891   2020.02  [Refereed]

    Joint Work

    DOI PubMed

  • Endocrinological characterization of an ovarian sex cord-stromal tumor with a Sertoli cell pattern in a Japanese Black cow.

    El-Sheikh Ali H, Kitahara G, Nibe K, Osawa T

    Reproduction in Domestic Animals = Zuchthygiene   54   1501 - 1504   2019.11  [Refereed]

    Joint Work

    DOI PubMed

  • Quantitative relationship between climatic conditions and the conception rate of Japanese Black cattle in commercial cow–calf operations

    Kino Erina, Uematsu Mizuho, Kitahara Go, Osawa Takeshi, Sasaki Yosuke

    Livestock Science   228   170 - 176   2019.08  [Refereed]

    Joint Work

  • Daily calving frequency and preterm calving is not associated with lunar cycle but preterm calving is associated with weather conditions in Japanese Black cows

    Sasaki Y., Kitai N., Uematsu M., Kitahara G., Osawa T.

    PLoS ONE   14   e0220255   2019  [Refereed]

    Joint Work

     View Summary

    © 2019 Sasaki et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Several external factors including lunar cycle and weather conditions might be associated with calving conditions. Our objective here was to determine the effects of lunar cycle and weather conditions on calving frequency and the occurrence of preterm calving in Japanese Black cows. Calving records were obtained from 905 farms in Miyazaki Prefecture, Japan. Data were collected from 41,116 calvings. We conducted two studies: Study 1 investigated the effects of lunar cycle and weather conditions on daily calving frequency (DCF) with the observational unit of each day and Study 2 investigated those effects on the occurrence of preterm calving with the observational unit for each calving. Preterm calving was defined by whether or not a cow calving before 280 days of gestation, lower 10th percentile of gestation length of the collected data, and by whether or not a cow calving before 289 days of gestation, median of the gestation length. For Study 1, lunar cycle was not associated with DCF in all cows, in only primiparous cows and in only multiparous cows. As well as lunar cycle, weather conditions such as temperature, diurnal temperature variation, the temperature-humidity index, precipitation amount, barometric pressure, relative humidity and solar radiation, were also not associated with DCF. For Study 2, lunar cycle phases were not associated with the occurrence of preterm calving. However, preterm calving was associated with all of the weather conditions (P < 0.05) except for precipitation amounts and solar radiation. Temperature, the temperature-humidity index and relative humidity were positively associated with the occurrence of preterm calving. In contrast, diurnal temperature variations and barometric pressure were negatively associated with the occurrence of preterm calving. In conclusion, the lunar cycle was not associated with DCF and preterm calving, but the weather conditions were associated with preterm calving.

    DOI PubMed

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Books 【 display / non-display

  • Buiatrics Third Edition

    Osawa Takeshi (Part: Joint Work )

    2013.10 ISBN: 978-4-87402-196-5

Review Papers 【 display / non-display

  • Applicability of a progesterone-based timed AI protocol after follicular fluid aspiration using OPU technique into suckled beef cows

    Journal of Reproduction and Development   53 ( 2 ) 171 - 177   2007

    Introduction and explanation (bulletin of university, research institution)   Joint Work

    DOI CiNii

  • Effect of active immunization of pony mares against recombinant porcine inhibin α subunit on ovarian follicular development and plasma steriods and gonadotropins

    Journal of Veterinary Medical Science   66 ( 1 ) 31 - 35   2004

    Introduction and explanation (bulletin of university, research institution)   Joint Work

    DOI PubMed

  • Application of timed artificial insemination protocols to grazing Japanese Black cattle with long open period.

    J. Vet. Med. Sci.   65 ( 4 ) 459 - 464   2003

    Introduction and explanation (bulletin of university, research institution)   Joint Work

    DOI PubMed CiNii

  • Endocrinological changes before and after removal of the granulosa theca cell tumor (GTCT) affected ovary in 6 mares.

    MD. Shafiqul HOQUE, Hiroyuki SENBA, Nobuo TSUNODA, Refaat Ibrahim DERAR, Gen WATANABE, Kazuyoshi TAYA, Takeshi OSAWA, Yoh-Ichi MIYAKE

    Journal of Veterinary Medical Science   65 ( 8 ) 887 - 891   2003

    Introduction and explanation (bulletin of university, research institution)   Single Work

    DOI PubMed

  • Comparison of the effectiveness of ovulation synchronization protocol in anestrous and cycling beef cows.

    J. Reprod. Dev.   49 ( 6 ) 513 - 521   2003

    Introduction and explanation (bulletin of university, research institution)   Joint Work

    DOI PubMed CiNii

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Other research activities 【 display / non-display

  • Large Animal Clinical Procedures for Veterinary Technicians 2nd ed.

    Book Review 

    2011.09
     
     

  • Equine Breeding Management and Artificial Insemination 2nd ed.

    Book Review 

    2009.04
     
     

Other external funds procured 【 display / non-display

  • Identification of specific lipid mediators in the cow with endometritis and development of a novel sensitive diagnostic method

    Project Year: 2017.06  -  2018.03 

Presentations 【 display / non-display

  • Bovine endometritis and bacteriology of uterus

    Takeshi Osawa  [Invited]

    International Conference "Endometritis as a Cause of Infertility in Domestic Animals"  2019.09  -  2019.09  Polish Academy of Sciences

  • Effect of Lactobacillus on uterine environment in dairy cows

    Wu, X., Naramoto, K., Suenaga, T., Kitahara, G., Osawa, T.

    日本畜産学会第125回大会  2019.03  -  2019.03 

  • Association of antral follicle count and peripheral anti-Mullerian hormone concentrations with fertility in beef cows

    Tanaka, M., Kitahara, G., Uematsu, M., Kobayashi, I., Hemmi, K,, Osawa, T.

    The 10th International Ruminants Reproduction Symposium  2018.09  -  2018.09 

  • Associations of lunar cycle and climate factors with frequency of mature and premature births in Japanese Black cows

    Sasaki, Y., Kitai, N., Uematsu, M., Kitahara, G., Osawa, T.

    The 30th World Buiatrics Congress  2018.08  -  2018.09 

  • Peripheral Anti-Mullerian hormone as biomarker in evaluating function of intra-abdominal testes in cattle

    Kitahara, G., El-Sheikh Ali, H., Kaneko, Y., Torisu, S., Hidaka, Y., Satoh, H., Asanuma, T., Hirai, T., Yamaguchi, R., Haneda, S., Osawa, T.

    The 30th World Buiatrics Congress  2018.08  -  2018.09 

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