EFFECT OF TECHNICAL PROGRESS ON HERD SIZES IN ANIMAL PRODUCTION

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作者：

ARTMANN, R

ROSEGGER, S

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来源：

LANDBAUFORSCHUNG VOLKENRODE | 1972年 / 22卷 / 01期

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S [农业科学];

学科分类号：

09 ;

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页码：69 / &

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