Abstract
The article presents the results of identifying parental line of Simmental cattle the most stable to aggressive environmental conditions in the Lower Volga region with high milk productivity. The experimental work was carried out at farm-breeding plant named after Lenin of Surovikinsky District of Volgograd Region. All of cows of the farm was distributed among the bulls of different lines, which were selected individually for each one. In total 79 first-calf heifers and 249 full-aged cows participated in the experiment. The assessment of milk productivity of the cattle population was carried out on the basis of data of SELEX program. Productivity of bulls daughters belonging to different breeding lines was examined. Also, as part of the work, the parameters of natural resistance-innate level were studied. The results obtained during the experiment were processed and analyzed using standard methods. it was concluded the most preferred line of cattle for breeding in farm-breeding plant named after Lenin of Surovikinsky District of Volgograd Region.
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