PEDIGREES AS A FACTOR OF CROPPER AND MILK CATTLE IMMUNITY: HISTORIC ASPECTS OF FORMATION AND DEVELOPMENT
The authors consider historic stages of Russian pedi- grees development and pedigrees creation in Ryazan oblast. One can see the oblast pedigree farms influ- ence on the increase of cropper and milk cattle immu- nity.Pedigree farms creation and scientific organization of selection work in combination with the developed artificial insemination infrastructure ef- fected positively on production and economic state of milk cattle branch of the region.