収益性を向上させる乳牛の飼養と管理 : 米国中西部4州酪農プロフェッショナルセミナー2003年

Four-State Professional Dairy Management Seminar : feeding and managing dairy cows to maximize profitability : MWPS-4SD14 : February 17, 2003, Wconia, MN, February 18, 2003, Kaukauna, WI, February 19, 2003, South Beloit, IL, February 20, 2003, Dubuque, IA

4 State Peofessional Dairy Management Seminar[編] ;･･･

69p 30cm