Purpose: Define physiological gestation length of hybrid sows large white x landrace PIC Russia’s genetic and find optimal model for farrowing synchronization.Materials and methods. Studying was carrying out at platfrom of MPC "Romcor" Ltd. located at v. Nizhnyaya Sanarka, Troitskiy rayon, Chelyabinskaya oblast'. There are drugs for farrowing induction didn’t used at formed control group of 780 sows, thus farrowing was natural. Experiment on farrowing synchronization by cloprostenol – synthetic analog of prostaglandin F2α administered at dosage 175 mcg per sow was designed at thee phases. At first phase (506 sows) cloprostenol was administered for primigravida sows at 117 day of gestation, since second reproductive cycle at 116 day. At second phase (857 sows) for primigravida at 117 day, for second at 114 day of gestation and over third cycle at 113 day. At third phase (803 sows) primigravida sows at 117 day, for second cycle at 116 day and for over third at 115 day of gestation. Piglets’ mortality was calculated at each group.Results. At control group gestation length was more than 115,7 days and piglets’ mortality was 18,9 %, there were oblique signs of overdue pregnancy at thi
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