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[dynamics and causes of mortality in poultry in the pleven district].studied were the various factors causing death and the dynamics of death in two broiler flocks, two parental flocks for broilers, and one flock of market egg layers. death rate among broilers ranged between 2.17 and 2.98 per cent. it was highest during the first week after which it sharply dropped up to the end of the fattening period. in some flocks it again rose in the 4th to 6th of 8th week owing to the onset avitaminosis e, coccidiosis or marek's disease. noninfectious and deficiency disease ...19751210009
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