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Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB, U.K., and Direcção Regional de Agricultura do Entre-Douro e Minho, 4594-909 Paços de Ferreira, Portugal,
Divisão de Leite e Lacticínios, Estação Experimental, Direcção Regional de Agricultura do Entre-Douro e Minho, 4594-909 Paços de Ferreira, Portugal, 4594-909 Paços de Ferreira, Portugal
Divisão de Leite e Lacticínios, Estação Experimental, Direcção Regional de Agricultura do Entre-Douro e Minho, 4594-909 Paços de Ferreira, Portugal, 4594-909 Paços de Ferreira, Portugal