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[1]
Department of Socio-Economy, Faculty of Animal Science, Brawijaya University, Jalan Veteran No. 1, Malang 65145, Jawa Timur, Indonesia
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[2]
Agricultural Economics and Rural Policy Group, Department of Social Sciences, Wageningen University & Research, Hollandseweg 1, 6706 KN Wageningen, the Netherlands
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[3]
Animal Production Systems Group, Wageningen University & Research, PO Box 338, 6700 AH, Wageningen , the Netherlands