Combination ability of selective carp groups during two-line breeding

This paper presents the results of studying the productive and physiological properties of carp crosses - interline or interbreed hybrids of the first generation. The resulting crosses have a high potential for growth, metabolism, and non-specific cellular immunity. It was found that the studied cross-breeding combinations produced a heterotic effect, which was manifested in different ways depending on the climate zone, planting density, and feeding. In the “Ergeninsky” cross, obtained from crossing the local scaly and Moldavian mirror lines, the true heterosis in relative growth rate amounted to 85-89%. As compared with the parent forms, it has a higher immune defense against pathogens, judging by the large proportion of Mature segmentonuclear neutrophils. The “Mirror” cross is the result of crossing males of the Moldavian mirror line and females of the Volga frame carp that has a scattered scale cover -100%, body weight significantly exceeds the Moldavian mirror parent form. The cross has a smaller proportion of monocytes and neutrophils in the leukogram, and the content of lysosomal cationic protein in the latter is lower, which suggests that these phagocytes are consumed in the process of immune defense. As compared with the parent forms, the cross has more intensive protein metabolism, which can be proved by the high content of total protein and albumins, ALT activity. The lipid metabolism can be determined by the content of cholesterol. The activity of creatine kinase in the “Volzhsky” cross is 2-3 times lower as compared to the initial groups. The “Volga” cross is a reciprocal interbreed hybrid of the Southern zonal type of the Chuvash scaly carp and the Volga frame carp that has a high level of lipid metabolism.

fish cross, heterosis, hematological parameters, biochemical analysis, lysosomal cationic test

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