Reproductive qualities and the manifestation of different forms of heterosis in sows of English origin of different breeding directions during purebred breeding, crossing, and hybr... by M. I. Kremez, M. H. Povod, B. V. Gutyj, M. B. Shpetnyi, O. H. Mykhalko, V. M. Nechmilov, S. V. Zhyzhka, I. S. Moisei, S. V. Tsap, O. S. Orishchuk

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