Papers - SOUMA Kousaku
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Assessment of anti-Müllerian hormone levels as a reproductive indicator in Japanese Black cattle
KOYAMA Takeshi, SUZUKI Hiromi, SHIMIZU Miki, MIZUNO Riuru, ISHIGAMI Ayaha, KAMIDATE Nobuyuki, OTANI Yoshihisa, OKUBO Michiko, SOUMA Kousaku, HIRAYAMA Hiroki
Journal of Reproduction and Development 70 ( 0 ) 389 - 395 2024.12
Language：English Publisher：The Society for Reproduction and Development
<p>The size of the ovarian reserve, an indicator of the number of primordial follicles, varies widely among individuals, and declines with age. However, the association between the ovarian reserve and fertility remains unclear. Therefore, in the present study, we analyzed the relationship between plasma concentrations of anti-Müllerian hormone (AMH), a marker of ovarian reserve, and reproductive outcomes in Japanese Black cattle. AMH level quartiles were positively associated with pregnancy following artificial insemination (AI), and the median number of days to pregnancy in Q4 (13 days, 95% confidence interval [CI] = 7–18 days) was significantly shorter than that in Q1 (21 days, 95% CI = 15–46 days). The odds ratio for the predicted pregnancy rate by logistic regression analysis in Q4 (4.06, 95% CI = 1.54–10.67) was also significantly higher than that in Q1. Plasma AMH concentrations were significantly higher in summer (June–August) than in winter (December–February). Furthermore, a strong correlation (r = 0.829, P < 0.001) was observed between plasma AMH concentrations at 2 and 14 months of age. Calves with plasma AMH concentrations of > 700 pg/ml at 2 months old showed a transient increase and maximum AMH concentration within 5 months of birth. Overall, the results of this study indicate that the plasma AMH concentration serves as a predictive marker for the probability of conception following AI in Japanese Black cattle. The current findings contribute to the reliable assessment of AMH production and the early prediction of reproductive performance in sexually mature heifers.</p>
DOI： 10.1262/jrd.2024-047
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Carcass traits and fat quality of breeding emu (Dromaius novaehollandiae) in Northern Japan Reviewed
Yuichi Koshiishi, Michiko Murata-Okubo, Hinami Nakajyo, Rikimaru Machida,, Taiga Yamamoto, Takao Myoda, Yuichi Kameyama, Hiroki Hirayama, Kousaku Souma, Michinari Yokohama, Kenta Wada
Poultry Science 101 102050 - 102057 2022.10
Language：English Publishing type：Research paper (scientific journal)
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Discrimination between two chromatic colors in sika deer Reviewed
Michiko Okubo, Mizuho Sato, Wataru Tamamura, Saori Tsutsumi, Shinpei Morie. Kousaku Souma
Applied Animal Behaviour Science 247 105536 - 105542 2022.02
Language：English Publishing type：Research paper (scientific journal)
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INABA Ryo, KAWAHARA-MIKI Ryouka, SHINOZAWA Akihisa, YASUHARA Taichi, FUJII Takashi, KOYAMA Keisuke, MURATA-OKUBO Michiko, SOUMA Kousaku, HIRAYAMA Hiroki
Journal of Reproduction and Development 68 ( 1 ) 30 - 37 2022
Language：English Publisher：The Society for Reproduction and Development
<p> Although hormonal induction of parturition in cattle results in the successful delivery of healthy calves, the risk of retained fetal membrane is significantly increased. In a previous study, a combination of the long-acting glucocorticoid, triamcinolone acetonide, with a high dose of betamethasone partially normalized the placentomal gene expression during parturition; however, the incidence of retained fetal membrane remained high. This study further explored placentomal dysfunction and aimed to elucidate the mechanism of retained fetal membrane in parturition-induced cows. In this study, transcriptome analysis revealed that enhanced glucocorticoid exposure normalized the expression of a substantial fraction of genes in the cotyledons. In contrast, a significant reduction in the multiple signaling pathway activities, including interferon signaling, was found in the caruncles during induced parturition. Real-time PCR showed that the expression of interferon-tau in the caruncles, but not interferon-alpha or interferon-gamma, was significantly lower in induced parturition than spontaneous parturition. Interferon-stimulated gene expression was also significantly decreased in the caruncles during induced parturition. These results indicate that interferon signaling could be important for immunological control in placentomes during parturition. Additionally, this suggests that interferon-tau might be a pivotal ligand for interferon receptors in the caruncles. This study revealed that peripheral blood leukocytes in prepartum cows transcribed interferon-tau. Macrophage infiltration in the placentome is known to participate in the detachment of the fetal membrane from the caruncle. Thus, this study raised the possibility that immune cells migrating into the caruncles at parturition may act as a source of ligands that activate interferon signaling.</p>
DOI： 10.1262/jrd.2021-094
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Development and characterization of ten novel microsatellite loci for the emu (Dromaius novaehollandiae) and genetic diversity of Japanese farm populations Reviewed International journal
Yuichi Koshiishi, Michiko Murata‑Okubo, Shin‑ichiro Fujisawa, Gaku Shimoi, Hiroki Hirayama, Yuichi Kameyama, Kousaku Souma, Kenta Wada
Molecular Biology Reports 20200221 2020.02
Language：English Publishing type：Research paper (scientific journal)
The emu (Dromaius novaehollandiae) is a useful poultry animal farmed for fat, meat, and eggs. Genetic structure and relationships among farmed emu populations in Japan are unknown and the number of microsatellite markers for genetic analysis of the emu is insufficient. In this study, we isolated 16 microsatellites from the emu genome and developed ten new microsatellite markers. These microsatellite markers were used to characterize three farm emu populations in Japan. The number of alleles ranged from 3 to 13 and the expected (HE) and observed heterozygosity (HO) of these microsatellite loci
was 0.187–0.802 and 0.179–0.647, respectively. The polymorphic information content ranged from 0.176 to 0.786. Positive inbreeding coefficient (FIS) values were detected in all tested populations, and they ranged from 0.027 to 0.540. These results suggest that farm populations of the emu in Japan resulted from inbreeding. The fixation index (FST) values ranged from 0.026 to 0.061, and phylogenetic trees and population
structure analysis confirmed no definitive genetic differentiation among the three populations. Therefore, these populations are at a relatively low level of genetic differentiation at present. The microsatellite markers developed in our study can be utilized for genetic analysis and preservation of genetic resources
in the emu. -
Mitochondrial DNA variations in Japanese farmed emu populations
KOSHIISHI Yuichi, UKITA Misuzu, MURATA-OKUBO Michiko, FUJISAWA Shin-ichiro, SHIMOI Gaku, HIRAYAMA Hiroki, KAMEYAMA Yuichi, SOUMA Kousaku, WADA Kenta
Journal of Veterinary Medical Science 82 ( 6 ) 731 - 734 2020
Language：English Publisher：JAPANESE SOCIETY OF VETERINARY SCIENCE
<p>The emu (<i>Dromaius novaehollandiae</i>) is a new poultry. In this study, we investigated the haplotype composition of mitochondrial DNA among emu populations farmed in Japan. We sequenced the D-loop region in 109 individuals, and detected four substitution sites and three haplotypes (Hap-a, -b, and -c). Hap-a was the most frequently observed haplotype in the Japanese populations. Although Hap-c was a rare haplotype in not only Japanese but also Australian populations, it was detected with high frequency in the Japanese farmed population. The AMOVA indicated that 9% of total variance was “among population”. The <i>F</i><sub>ST</sub> value was 0.087 and genetic differentiation was significant (<i>P</i><0.01). These results may contribute to conserving the genetic resources available for the Japanese emu industry.</p>
DOI： 10.1292/jvms.19-0693
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エミューの飼養とエミュー肉を利用した肉製品の製造 Invited
中澤洋三,相馬幸作
食肉の科学 60 ( 1 ) 87 - 92 2019.11
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Fermentation quality and nutritive value of the silage prepared from potato pulp and wheat bran Invited Reviewed
Michiko OKUBO, Kouki HARA, Yuichi MIYAGI, Takayoshi MASUKO, Kousaku SOUMA
7 17 - 24 2019.03
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Estimation of the dry matter and crude protein intakes Yeso sika deer (Cervus nippon yesoensis) on the pasture in the Shiretoko Ezoshikafarm Reviewed
Michiko OKUBO, Hiroaki SHIMIZU, Takuya SEKIZAWA, Yoshiki TSUCHIDA, Masaaki TOMITA, Masaaki HANADA, Takayoshi MASUKO, Kousaku SOUMA
7 25 - 29 2019.03
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Changes in Water Soluble Carbohydrates Content of Timothy (Phleum pratense L.) in Pastures of TMR Centers over 4 Years Reviewed
Michiko Okubo, Daisuke Takahashi, Fumiya Abe, Hideshi Shinoda, Kenzaburo Deguchi, Norie Shio, Takayoshi Masuko, Kousaku Souma
American Journal of Plant Sciences 10 276 - 284 2019.01
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Chemical characterization of the milk oligosaccharides of some Artiodactyla species including giraffe (Giraffa camelopardalis), sitatunga (Tragelaphus spekii), deer (Cervus nippon yesoensis) and water buffalo (Bubalus bubalis)
Mineguchi Y,Miyoshi M,Taufik E,Kawamura A,Asakawa T, Suzuki I,Souma K,Okubo M,Saito T,Fukuda K
Glycoconjugate Journal 35 561 - 574 2018.12
Language：English Publishing type：Research paper (scientific journal)
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Data on chemical compositions and fermentation quality of silages made from lowmarket- value vegetables supplemented with potato protein concentrate, a byproduct of starch production Reviewed
Michiko Okubo, Kazunari Sato, Shunsuke Matsuda, Takayoshi Masuko, Kousaku Souma
Data in Brief 21 1829 - 1832 2018.11
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Sex and diffrence in feed intake, weight gain, and feeding performance on Short-term rearing Yeso sika deer (Cervus nippon yesoensis) captured in the wild Reviewed
Kousaku souma, Maki Hayashida, Hirofumi Kudo, Kazuki Sugo, Takemichi Irabu, Keisuke Tojo, Takayoshi Masuko
Nihon Chikusan Gakkaiho 86 ( 3 ) 367 - 374 2015.08
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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First detection of adiaspiromycosis in the lungs of a deer
Kazuya MATSUDA,Hinako NIKI,Airo YUKAWA,Mitsuhiro YANAGI,Kousaku SOUMA,Takayoshi MASUKO,Hiroyuki TANIYAMA
Journal of Veterinary Medical Science 77 981 - 983 2015.08
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.1292/jvms.15-0083
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Sex and age differences in meat composition of Yeso sika deer (Cervus nippon yesoensis) reared for a short period after capture in the wild Reviewed
Maki Hayashida, Kousaku Souma, Kazuki Sugo, Shin-ichi Araki, Fumiaki Ishizuka, Masami Ueda, Takamasa Kasai, Takayoshi Masuko
Animal Science Journal 86 207 - 213 2015.02
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
北海道阿寒湖周辺で冬季に生体捕獲したエゾシカを、東京農業大学エゾシカ飼育施設に移送し、8～10ヵ月間飼育した満1歳の雌雄鹿6頭および満2歳以上（成獣）の雌雄鹿6頭を解体処理し、ロース肉の一般成分含量、ミネラル含量および脂肪酸組成を測定した。生体捕獲後短期飼育したエゾシカのロース肉の一般成分含量とミネラル含量、脂肪酸組成において性別あるいは年齢別による有意差が認められたのはミネラル含量のみであった。
DOI： 10.1111/asj.12274
Other Link： http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1740-0929
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Fermentation quality, nutritive value and nutrient intake by sheep of substandard carrot silage supplemented with wheat bran Reviewed
Kousaku Souma, Koji Kaneta, Takayoshi masuko
Hokkaido Journal of Livestock and Grassland Science 2 73 - 77 2014.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Feed preferences of emus (Dromaius navaehollandiae) on feeding by-products of crops and food processing Reviewed
Kousaku Souma, Sayaka Iwase, Koji Kaneshi, Masahiro Kodera, Ayami Fuseya, Takayoshi Masuko
Hokkaido Journal of Livestock and Grassland Science 2 85 - 91 2014.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Meat production and nutrient composition in meat from the fawns born to captured wild female Yeso sika deer (Cervus nippon yesoensis) Reviewed
Maki Hayashida, Kousaku Souma, Hirofumi Kudo, Keisuke Tojo, Satoshi Ikeda, Toshiyuki Fujimori, Tatsuhiko Ando, Takayoshi Masuko
Hokkaido Journal of Livestock and Grassland Science 2 79 - 84 2014.03
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Effects of Potassium Fertilizer on Water-Soluble Carbohydrate Content of Timothy (Phleum pratense L.), Silage Fermentation, Nutritive Values, and Nutrient Intake Reviewed
Peng Wang, Kousaku Souma, Hideki Okamoto, Satomi Kin, Akane Sugita, Akihiro Furudate, Chihiro Sato, Akio Nibe, Yimin Cai, Takayoshi Masuko
American Journal of Plant Sciences, 5 ( 7 ) 1030 - 1038 2014.03
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
生産現場で課題となっている牧草地土壌の高カリウム施肥の影響に着目し、カリウムを標準施肥あるいは高水準施肥で栽培したチモシーを用い、牧草中のWSC含量の変化、乳酸菌製剤の添加効果について検討し報告した。
Other Link： http://www.scirp.org/journal/AJPS/
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Effect of timing of shipment on composition of meat from captured female wild Yeso sika deer (Cervus nippon yesoensis) Reviewed
Maki Hayashida, Kousaku Souma, Makoto Hsanaga, Reiko Sawada, Shingo Tamai, Yasuhiro Morisaki, Nao Nishigaki, Asuka Noda, Takao Myoda, Takayoshi Masuko
Hokkaido Journal of Livestock and Grassland Science 1 55 - 61 2013.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Prevalence and genetic diversity of Bartonella species in sika deer (Cervus nippon) in Japan Reviewed
Sato S, Kabeya H, Yamazaki M, Takeno S, Suzuki K, Kobayashi S, Souma K, Masuko T, Chomel BB, Maruyama S,
Comparative Immunology, Microbiology and Infectious Diseases 35 575 - 581 2012.12
Language：English Publishing type：Research paper (scientific journal)
日本国内のニホンジカのバルトネラ感染状況について調査し、まとめた。
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Status of measures for the use of community resources generated from captive Yeso sika deer (Cervus nippon yesoensis) and proposal of new measure Invited Reviewed
Takayoshi masuko, Kousaku Souma, Maki Hayashida, Mkoto Hisanaga, Takashi Ikenaga, Nobuo Ishikawa
Grassland Science 58 ( 3 ) 200 - 211 2012.10
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Feed composition in the dof food made of wild Yeso sika deer (Cervus nippon yesoensis) Reviewed
Maki Hayashida, Kousaku Souma, Osamu Honda, Yusuke Wkayama, Takayoshi Masuko
Hokkaido Animal Science and Agriculture Society 54 53 - 57 2012.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Seasonal changes of the mineral contents in the rumen of wild Yeso sika deer (Cervus nippon yesoensis)
Maki Hayashida, Kousaku Souma, Osamu Hanagata, Masayo Okamoto, Takayoshi Masuko
Animal Science Journal 83 ( 3 ) 227 - 231 2011.09
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Bat Fauna in Three River Basins Originating in Mt. Mokoto, Hokkaido Reviewed
Sugai S, Kondo N, Souma K, Masuko T
Journal of Agriculture Science, Tokyo University of Agriculture 56 ( 2 ) 155 - 161 2011.09
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
Other Link： http://ci.nii.ac.jp/vol_issue/nels/AN00164184/ISS0000470701_ja.html
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Effects of the feeding of wild Yeso sika deer (Cervus nippon yesoensis) on the prevention of damage due to bark stripping and the use of feeding sites Reviewed
Masuko T, Souma K, Kudo H, Takasaki Y, Fukui E, Kitazwa R, Nishida R, Niida T, Suzuki T, Nibe A
Animal Science Journal 82 ( 4 ) 580 - 586 2011.04
Language：English Publishing type：Research paper (scientific journal)
1999–2003年に阿寒国立公園内の阿寒湖周辺の林道で実施した、エゾシカ餌付け手法が樹皮食害防止とエゾシカの個体数に及ぼす影響について検討を行った。
DOI： 10.1111/j.1740-0929.2010.00863.x
Other Link： http://onlinelibrary.wiley.com/doi/10.1111/asj.2011.82.issue-4/issuetoc
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The Role of Year-Round Dismembering and Meat Processing Facilities for Effective Utilization of Sika Deer Reviewed
Kasai F, Kitahara R, Touma, M, Tomita, K, Souma K, Masuko T
Shiretoko Museum 32 53 - 58 2011.03
Language：Japanese Publishing type：Research paper (scientific journal)
Other Link： http://shir-etok.myftp.org/shuppan/kempo/kempo32
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Influences of combination feeding of high moisture low quality grass-dominant mixture silage with corn silage on nutritive value and feed intake in sheep Reviewed
Kousaku Souma, Peng Wang, Fumie Kanda, Hiroaki Igarashi, Takayoshi Masuko
Grassland Science 57 ( 1 ) 18 - 22 2011.03
Language：English Publishing type：Research paper (scientific journal)
劣質の高水分牧草サイレージが調製された場合を想定し、トウモロコシサイレージを併用給与することで栄養価を改善と劣質牧草サイレージの給与割合について消化試験を実施して検討し、その結果を報告した。
DOI： 10.1111/j.1744-697X.2010.00203.x
Other Link： http://onlinelibrary.wiley.com/doi/10.1111/grs.2011.57.issue-1/issuetoc
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Influence of Northern Leaf Blight on corn silage fermentation quality, nutritive value and feed intake by sheep
Peng Wang, Kousaku Souma, Yuki Kobayashi, Kei Iwabuchi, Chihiro Sato and Takayoshi Masuko
Animal Science Journal, 81 2010.08
Language：English Publishing type：Research paper (scientific journal)
すす紋病に罹患したトウモロコシサイレージの発酵品質と栄養価の影響について報告した。
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Effects of adding fermented juice of epiphytic lactic acid bacteria on fermentation quality and flora of lactic acid bacteria in grass silage Reviewed
Peng Wang,Kousaku,Souma,Nobue Ishii,Sanae Okada,Tai Uchimura,Mitsuaki Ohshima,Takayoshi Masuko
55 141 - 147 2009.07
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Approach to the Preparation of High Quality Grass Silage(<Special Feature>Efforts to Increase Self-sufficiency and Improve Utilization of Roughage in Hokkaido) Invited Reviewed
Takayoshi Masuko,Hideki Okamoto,Peng Wang,Kousaku Souma
Japanese Society of Grassland Science 55 56 - 68 2009.04
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Influence of the addition of a lactic acid bacterial inoculant or mixture of lactic acid bacteria and enzyme to corn silage on fermentation quality and the nutritive value and nutrient intake by sheep
Journal of Japanese Society of Grassland Science 54 ( 4 ) 311 - 316 2009.01
Language：Japanese Publishing type：Research paper (scientific journal)
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上川北部および十勝地方におけるチモシー（Phleum pratense L.）の可溶性炭水化物含量および土壌化学性の変動実態 Reviewed
増子孝義・相馬幸作・白井美帆・河合佑典・古川研治・柴田浩之・林川和幸・三枝俊哉
日本草地学会誌 54 257 - 259 2008.10
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
大規模サイレージ調製を実践している上川北部、十勝山麓と中央部の酪農家の牧草と土壌を採取し、牧草の可溶性炭水化物（WSC）含量、無機物含量および土壌の化学性の変動実態を調べ、報告した。
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Effects of the addition of formic acid, a bacterial inoculant, and a bacterial inoculant and enzyme mixture on the fermentation quality and flora of lactic acid bacteria of grass silage Reviewed
Peng Wang, Kousaku Souma, Nobue Ishii, Masanori Yamada, Sanae Okada, Tai Uchimura, Takayoshi Masuko
Journal of Japanese Society of Grassland Science 54 ( 3 ) 205 - 210 2008.10
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Effect of the discontinuation of feed supply to wild Sika deer (Cervus nippon yesoensis) on bark damage Reviewed
Hirofumi Kudo, Takayoshi Masuko, Kousaku Souma, Haruna Ishikawa, Yukari Takasaki,Rikihiro Nishida,Toshimitsu Niida,Risaku Kitahara,Akio Nibe
Animal Behavior and Management 44 ( 4 ) 237 - 244 2008.04
Language：Japanese Publishing type：Research paper (scientific journal)
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Effective utilization of yeso sika deer (Cervus nippon yesoensis) Invited Reviewed
Animal Science and Agriculture Hokkaido 50 29 - 35 2008.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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The control of number of wild sika deer (Cervus nippon yesoensis) by live-capture in feeding areas Reviewed
Animal Science and Agriculture Hokkaido 50 49 - 55 2008.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Water soluble carbohydrate and mono- and oligosaccharides content of wilted timothy (Phleum pratense L.) harvested in the morning and evening and fermentation quality of wilted silage
Takayoshi MASUKO,Kousaku SOUMA,Peng WANG,Kazunori YAMADA,Seitarou YAMADA,Yimin CAI,Akio NIBE
79 37 - 44 2008.02
Language：Japanese Publishing type：Research paper (scientific journal)
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ギ酸，乳酸菌製剤および乳酸菌製剤と酵素剤の混合添加グラスサイレージの給与がヒツジにおける栄養価および養分摂取量に及ぼす影響
相馬幸作・増子孝義・王 鵬・堤 裕江・原 裕子・花田正明・岡本明治
日本草地学会誌 53 270 - 276 2008.01
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
ギ酸，乳酸菌製剤および乳酸菌製剤と酵素剤の混合物を添加して調製した無予乾および軽予乾グラスサイレージをヒツジに給与して消化試験を実施した。発酵品質，栄養価および養分摂取量が無添加区よりも向上したのは，無予乾サイレージのギ酸添加区のみであった。
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Effects of the Addition of Formic acid, a Bacterial Inoculant, and a Bacterial Inoculant and Enzyme Mixture on the Fermentation Quality and Flora of Lactic Acid Bacteria of Grass Silage Reviewed
Peng Wang,Kousaku Souma,Nobue Ishii,Masanori Yamada,Sanae Okada,Tai Uchimura,Takayoshi Masuko
54 205 - 210 2008.01
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Factors Affecting Water Soluble Carbohydrates Content and Sugar Composition of Timothy (Phleum pratense L.), the Leading Grass Species in Hokkaido Reviewed
Kousaku SOUMA, Takayoshi MASUKO,Chihiro SHIMIZU,Kazunori YAMADA,Yimin CAI
Nihon Chikusan Gakkaiho 77 495 - 500 2006.11
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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A nutritional study of yeso sika deer (Cervus nippon yesoensis) under farming Reviewed
Takayoshi Masuko, Kousaku Souma, Yoshiro Ishijima
47 ( 1 ) 53 - 67 2003.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Chemical composition and in vitro dry matter digestibility of woody plants ea ten by yeso sika deer (Cervus nipρon yesoensis) during from winter to spring seaso Reviewed
Takayoshi Masuko, Kousaku Souma, Risaku Kitahara, Naomi Sawada, Ken Miyairi,Yoshiro Ishijima
Animal science and agriculture Hokkaido 43 41 - 47 2001.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Intake, digestibility and nitrogen balance of Sasa (Sasa senanensis) in Yeso sika deer (Cervus nippon yesoensis) Reviewed
Taoayoshi Masuko, Kousaku Souma, Ken Miyairi, Teruyuki Komatsu, Yoshiro Ishijima
Animal science and agriculture Hokkaido 41 72 - 75 1999.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Studies of nutrition in Yeso sika deer feeding Reviewed
Takayoshi Masuko, Kousaku Souma
Animal science and agriculture Hokkaido 41 1 - 9 1999.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Changes in Chemical Composition and in vitro Dry Matter Digestibilit of Sasa (Sasa senanensis) on Different Growth Stage Reviewed
Animal science and agriculture Hokkaido 41 76 - 79 1999.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Digestibility and nitrogen balance in Yeso sika deer (Cervus nipρon yesoensis) fed mixtured of hay and wheat bran or soybean meal Reviewed
Animal science and agriculture Hokkaido 40 22 - 26 1998.05
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Seasonal alteration of hay intak in the Yeso sika deer (Cervus nippon yesoensis)
Kousaku Souma, Takayoshi Masuko,Yuichi Kobayashi, Yosiro Ishijima
Animal science and agriculture Hokkaido 40 27 - 30 1998.05
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Digestibility and Nitrogen Balance in Yeso Sika Deer (Cervus nippon yesoensis) Fed Round Baled Hay, Aalfalfa Hay Cube and Round Baled Silage Reviewed
Takayoshi MasuKo, Kousaku Souma, Hiromi Kumagai, Kouhei Takasaki, Ynichi Kameyama, Yoshiro Ishijima
Japanese Society of Grassland Science 43 32 - 36 1997.04
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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The Amount of Rumen Contents in Wild Yeso Sika Deer (Cervus nippon yesoensis) Reviewed
Takayoshi Masuko, Kousaku Souma, Yoshiro Ishijima
Japanese Society of Grassland Science 42 176 - 177 1996.07
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Intake of Wild Herbaceous and Arboreous Plant in The Yeso Sika Deer (Cervus nipρon yesoensis) and Its Chemical Composition
Kousaku Souma, Yakayoshi Masuko, Risaku Kitahara, Yoshiro Ishijima
Animal science and agriculture Hokkaido 36 98 - 104 1996.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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The palatability of Hay, Silage and Sasa (Sasa senanensis) on the Yeso Sika Deer(Cervus nippon yesoensis) Reviewed
Kousaku Souma, Yukie honda, Takayoshi Masuko, Yoshiro Ishijima
Animal science and agriculture Hokkaido 37 28 - 34 1995.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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General Behavior of The Sika Deer (Cervus nippon) under Housing Reviewed
Kousaku Souma, Takayoshi Masuko, Yoshiro Ishijima
Animal science and agriculture Hokkaido 36 57 - 62 1994.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)