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Featured researches published by Katsunori Sato.


Biochemical Genetics | 1988

Heterosis in body weight and muscle protein turnover rate in the coturnix quail

Yoshizane Maeda; Katsunori Sato; Shin Okamoto; Tsutomu Hashiguchi

Taux de synthese et de degradation des proteines musculaires, poids corporel, taux de croissance et conversion de la nourriture etudies chez des hybrides heterotiques de la caille du japon obtenus par croisement entre 2 lignees endogames


Nihon Chikusan Gakkaiho | 1991

Mitotic Activity in the Inbred and Hybrid Quail Embryos

Yanuarso Eddy Hedianto; Katsunori Sato; Yasuo Kawamoto; Takayoshi Ino

In the previous papers5), marked retardation in embryonic development and decrease in embryonic weight were found in the inbred lines, while restoration of embryonic development and embryonic weight was observed in crosses between inbred lines of Japanese quail. It is well known 2-4,10) that cell number increases during morphogenesis of the early chick embryos and that a highly positive correlation is found between the early embryonic development and cell number. Furthermore, mitotic activity such as the number of mitotic cells and mitotic index 4,8,11) is used as an indication of cell increase in relation to the rate of embryonic development. However, there is very little published information on the relationship between embryonic development and mitotic activity of quail embryos. This study was undertaken to investigate the mitotic activity in the inbred and hybrid quail embryos. Materials and Methods The Japanese quail used in this study consisted of inbred lines (F=59.4%), crossbreds obtained by crossing between inbred lines (F= 50.0%) and a randombred population as described in our previous report5). The number of pair-matings used in the inbred lines, crossbreds and in randombred population were 38, 34 and 40, respectively. The quail were kept under 14 hours light per day and fed freely with a diet containing 24% protein. The eggs for this study were collected and incubated for 48 hours at 38.2°C. At the


Nihon Chikusan Gakkaiho | 1984

Relationship between Egg Fertility and Testes Weight and Semen Characteristics in Japanese Quail Bred by Full-Sib Mating

Katsunori Sato; Susumu Sato; Takayoshi Ino

本研究は,近交による日本ウズラの受精率低下の原因を明らかにするために,近交によっておこる受精率の低下と雄の性機能との関係について検討した.実験に使用した日本ウズラは,近交群と無作為交配群の1,2世代である.1. 近交群の受精率は2世代目で急激な低下がみられ,無作為交配群との間に有意差が認められた.2. 近交群では無作為交配群に比較して,精巣重量,精液量,精子濃度,精子の運動性はすべて減少し,これに対して奇形精子の出現頻度は増加した.しかしながら,精液pHには両群間で差異が認められなかった.3. 受精率の高い群では受精率の低い群に比べて,精巣重量,精液量,精子濃度,精子の運動性,奇形精子の出現頻度はいずれもすぐれた値を示した.4. 相関係数は,受精率と精巣重量の間では+0.535,受精率と精液量の間では+0.547,受精率と精子濃度の間では+0.824,受精率と精子の運動性の間では+0.875,受精率と奇形精子の出現頻度の間では-0.862となり,いずれも有意な値が認められた.5. 以上の結果から,近交による受精率の低下は雄での造精機能全体の低下,障害に起因するものと考えられる.


Experimental Animals | 2008

Type 2 diabetes mellitus in a non-obese mouse model induced by Meg1/Grb10 overexpression.

Yoshie Yamamoto; Fumitoshi Ishino; Tomoko Kaneko-Ishino; Hirosuke Shiura; Kozue Uchio-Yamada; Junichiro Matsuda; Osamu Suzuki; Katsunori Sato


Journal of Poultry Science | 2005

Effects of Dietary Protein Levels on Production and Characteristics of Japanese Quail Eggs

Eishu Ri; Katsunori Sato; Takuro Oikawa; Tetsuo Kunieda; Hideji Uchida


Experimental Animals | 1989

Genetic Parameters of Egg Characteristics in Japanese Quail

Katsunori Sato; Namie Ida; Takayoshi Ino


Acta Medica Okayama | 2003

Enhancement of norepinephrine-induced transient contraction in aortic smooth muscle of diabetic mice.

Asaki Abe; Chiaki Kawasoe; Yasuhiro Kondo; Katsunori Sato


Journal of Poultry Science | 1989

Heterosis for Growth in Reciprocal Crosses of Highly Inbred Lines of Japanese Quail

Katsunori Sato; Hiroyuki Fukuda; Yoshizane Maeda; Yanuarso Eddy Hedianto; Takayoshi Ino


Experimental Animals | 2004

Establishment of a Set of Combined Immunodeficient DA/Slc-Foxn1rnu Lystbg Congenic Rat Strains

Norio Masui; Tetsu Nishikawa; Yumie Takagi; Hiromitsu Kimura; Masayuki Mori; Shigeo Yokose; Hidekazu Asai; Toshihiko Gonda; Makoto Yanabe; Katsunori Sato


Journal of Veterinary Medical Science | 1998

Cloning and Mapping of the Mouse Gpx2 gene Encoding Gastrointestinal Glutathione Peroxidase

Takehito Tsuji; Yuka Watanabe; Hideki Katoh; Katsunori Sato; Tetsuo Kunieda

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