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M. NAITO
Fac. Agric., Univer. Tokyo
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E. OKUBO
Fukushima Breeding Stock Farm
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H. NEMOTO
Fukushima Breeding Stock Farm
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A. ABE
Fukushima Breeding Stock Farm
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S. SUZUKI
Fukushima Breeding Stock Farm
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S. KOTSUKI
Div. Zootech. Sci., Hokkaido Agric. Exp. Sta.
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M. SAKURAI
Div. Zootech. Sci., Hokkaido Agric. Exp. Sta.
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T. KATSUKI
Div. Zootech. Sci., Hokkaido Agric. Exp. Sta.