One of the authors of this paper (B elyaev, D. K., 1962-1973) has developed an idea that some features and functions characteristic of the ancestors of modern domestic animals were rearranged in the process of domestication mainly by means of selection for behaviour traits. Selection has led to formation of animals with domesticated behaviour which were resistant to the stressing factors of breeding under the man’s control. Due to correlation between behaviour and reproductive function, the selection for behaviour during domestication brought about drastic changes in some features of reproduction (shift of breeding season, loss of monoestrousness and appearance of polyestrousness, increase of fertility, etc.).

D. K Belyaev, V. N Martynova

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 1039–1042, 1974
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