factors affecting mortality of crossbred and exotic chickens kept under backyard systems in yucatan, mexico.chicken mortality was studied in 24 randomly selected smallholder flocks in one village in yucatan, mexico between july and december 1993. each family received a package of 10 to 12 chicks of 3 weeks of age. approximately half of the chicks were purebred and the remainder were crosses produced by mating exotic with local breeds. all smallholders were visited twice a week. feeding and management (except vaccination and medication) were left to smallholders. data were processed by chi-square, mant ...19979316231
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