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Information × Registration Number 0225U005155, (0124U001589) , R & D reports Title To study the reproductive qualities and the level of their phenotypic consolidation in sows of different origin and intrabreed differentiation according to the receptor (ESR) and melanocortin (MC4R) genes popup.stage_title Дослідити відтворювальні якості та рівень їх фенотипової консолідації у свиноматок різного походження та внутрішньопородної диференціації за генами рецептора (ESR) і меланокортину (MC4R) Head Khalak Viktor I., Кандидат сільськогосподарських наук Registration Date 26-12-2025 Organization State Institution "Institute of Grain Crops" of the National Academy of Agrarian Sciences of Ukraine popup.description1 The purpose of the work is to investigate the reproductive qualities and the level of their phenotypic consolidation in sows of different origins, taking into account their intrabreed differentiation according to some genetic markers popup.description2 It was found that in sows of the Large White breed of Hungarian origin and French selection for the melanocortin receptor (MC4R) and estragon receptor (ESR) gene, the frequency of alleles A and G and A and B is 0.54 and 0.46 and 0.57 and 0.43, the frequency of genotypes AA, AG and GG is 0.37, 0.35 and 0.28; AA, AB and BB is 0.32, 0.50 and 0.18. In sows of the ½ Large White × ½ Landrace combination, the frequency of alleles A is 0.60, G is 0.40, the frequency of genotypes AA, AG and GG is 0.35, 0.48 and 0.17; for the tarragon receptor (ESR) gene – the frequency of alleles A and B is 0.40 and 0.60, the frequency of genotypes AA, AB and BB is 0.16, 0.48 and 0.36, respectively. Longer lifespan and breeding use are characterized by sows of the Large White breed of Hungarian origin of the MC4RAG and ESRВВ genotype, French selection of the MC4RGG and ESRAB genotype, sows of the ½ Large White × ½ Landrace combination of the MC4RAA and ESRAB genotype; in terms of multiparity and litter weight at the time of weaning at the age of 28 days, the advantage was established in sows of the Large White breed of Hungarian origin of the MC4RAG and ESRВВ genotype, the Large White breed of French selection of the MC4RGG and ESRAA genotype, and the ½ Large White × ½ Landrace combination of the MC4RAG and ESRВВ genotype. The phenotypic consolidation coefficients (K1 and K2) of multiparity and litter weight at the time of weaning at the age of 28 days in sows of different genotypes according to the melanocortin receptor gene (MC4R) are at the level of –0.569 (K2, multiparity, MC4RAG genotype) – +0.406 (K2, multiparity, ESRAA genotype). The coefficients of phenotypic consolidation (K1 and K2) of multiparity and litter weight at the time of weaning at the age of 28 days in sows of different genotypes according to the melanocortin receptor gene (MC4R) are at the level of –0.569 (K2, multiparity, MC4RAG genotype) – +0.406 (K2, multiparity, ESRAA genotype). The coefficient of repeatability of mu Product Description popup.authors Viktor I. Khalak Tetiana V. Kolbasina popup.nrat_date 2025-12-26 Close