Soviet biologist who developed a method for artificially inseminating (artificial insemination) domestic animals.

In 1898 Ivanov established in Moscow several zoological laboratories where he studied the structure and vital processes of sex organs of farm animals, including the secretions of accessory sex glands during impregnation. From his observations he concluded that the single condition necessary for impregnation was the union of spermatozoon and egg and that spermatozoa retain their motility and potency for a certain length of time if properly preserved. Ivanov succeeded in developing techniques for obtaining, preserving, and disinfecting semen, in addition to devising a procedure for artificial insemination that could be used for all types of livestock.

In 1901 Ivanov founded the world's first centre for artificially impregnating horses at Dolgoe Village, Orlovskaya guberniya. He proceeded to experiment with interspecies hybridization, crossbreeding domestic animals with wild varieties by means of artificial insemination. His object was to produce commercially usable hybrids and to develop new breeds more resistant to illness and more adaptable to the harsh Russian winters. He produced, for example, a hybrid of domestic horse by crossbreeding a zebra and Przewalski's horse (Equus caballus przewalskii), the only true wild horse still in existence. He also sought to preserve certain endangered species of wild animals, such as the wisent (European bison).