Abstract
A new three-breed cross-hybrid of carp has been obtained in the fish farm «Kirya» of the Chuvash region (RF). A comparative assessment of the fingerlings showed the advantages of the cross over other crosses grown in the same farm (Sursky malokostny and Petrovsky) on a number of indicators: weight, body length, indices of high-spin, physical development. In the youngsters of the new cross, the intensity of hematopoiesis (erythropoiesis and leukopoiesis) is higher than in the rest of the studied crosses. The content of lysosomal cationic protein in the blood neutrophils of the new cross-hybrid is at an optimal level and indicates a good state of cellular immunity of fish.
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