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Operating cost items, except those for farm raised inputs, were taken directly from survey responses to questions about the dairy expenditures for each item. Homegrown harvested and grazed feed costs were computed using market prices for each feed item to estimate the opportunity cost of feed fed to dairy cattle. State average market prices were used to value the harvested feed items fed to dairy cows on conventional dairies (USDA, National Agricultural Statistics Service). Because organic feed prices are significantly higher than those for conventional feeds, premiums paid by organic producers for feed items were estimated. | Book of Abstracts of the 62nd Annual Meeting of the European Federation of Animal Science Book of abstracts No. 17 2011 Stavanger Norway 29 August - 2 September 2011 Book of Abstracts of the 62nd Annual Meeting of the European Federation of Animal Science EAAP - European Federation of Animal Science The European Federation of Animal Science wishes to express its appreciation to the Ministero delle Politiche Agricole e Forestali Italy and the Associazione Italiana Allevatori Italy for their valuable support of its .
