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In two farms of slaughter chickens (Hybro) situated at the Kraków voivodeship the ascites hypoxia syndrome was diagnosed. Mass losses, 150—200 chickens/day started in chickens ageing 2—3 weeks. Hiperproduction of erythroblasts in the bone marrow followed by their accumulation in precapillares and capillares, and then even sometimes in the great wessels of the internal organs was noted. As a result...
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