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Published online by Cambridge University Press: 18 September 2007
(1) One of three papers presented at a symposium on a “Study of Some Aspects of the Structure of Animal Production in Europe” sponsored by the European Association for Animal Production in Cooperation with the Food and Agricultural Organization of the United Nations, the Conféderation Européene des Agriculteurs. and the International Federation of Agricultural Producers, Rome, Italy, June 9, 1970.