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The Cow Tester's Manual
James Frank Kendrick
出版U.S. Department of Agriculture, 1940
URLhttp://books.google.com.hk/books?id=m4UoAAAAYAAJ&hl=&source=gbs_api
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註釋The cow tester should be a practical dairyman enthusiastic about dairying. He must keep complete records of the production, feed consumption, and income for each cow in the herd so that the owner may use the records as a guide in feeding and culling the herd for more efficient milk production.