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Our research aimed to establish the productivity of piglets during their two-phase rearing with different durations of the phases of this period of the production cycle. It was established that at the end of the first rearing phase, animals' absolute gains and weight upon its completion depended more on its duration than on the intensity of piglet growth during this period. Thus, in the group where the duration of the first phase of rearing was 17.6 % shorter, the weight of piglets when transferred to the second phase of rearing was 15.0 % lower, while in the group where the duration of the first phase of rearing was 35.3 % shorter, the weight of animals when transferred to the second phase turned out to be 28.3 % smaller, and in the group where the duration of the first phase of rearing was 52.9 % shorter, the weight of piglets at the end of the first phase turned out to be 50.5 % lower. In the second phase of fattening, the intensity of growth in animals with a duration of 9 and 18 days did not have significant differences, while their counterparts with a 27-day duration of the second phase of fattening had average daily gains in the second phase of fattening by 13.7–15.6 % more than the previous groups. The difference in absolute growth depended more on the duration of the period and less on the intensity of growth during this period. Thus, in the group where the duration of the second phase of rearing increased by 17 %, the absolute growth during this time increased by 1.97 times, and with its increase by 35 %, the latter increased by 3.41 times compared to the group of piglets where the duration of the second phase of rearing was 9 days. The live weight of piglets at the end of the second growing phase increased by 4.3 % and 8.5 %, respectively. The preservation of piglets in the second phase of rearing did not have significant differences between groups of piglets with different durations of the second phase of rearing. In contrast, the average weight of piglets dropped out in the second rearing phase decreased by 15.4–33.5%, with an increase in the duration of the second phase from 18 % to 35 and 52 % of the entire growing time. It has been proven that with an increase in the duration of the second phase of rearing, in which liquid feeding of piglets was used by 18 %, 35 %, and 53 % of the entire rearing time, the intensity of growth of piglets increased, and due to which their absolute growth increased by 4.5 %, 10.2 %, and 16.3 %, respectively, the live weight at the transfer to fattening increased by 3.4 %, 7.9 %, and 12.2 %, respectively, the technological waste of piglets decreased by 1.06 %, 1.83 %, and 2.23 %, decreased by 13.7, and 25.8 %, the weight of piglets that were eliminated during the entire period of rearing compared to analogs that had 100 % of the time the first phase of rearing under dry feeding systems.

The article examined the dependence of sow productivity, the growth rate of suckling piglets, their weight at transfer to rearing, the consumption of precursor feeds, and their costs on dry and liquid feeding systems for piglets in the suckling period. The dependence on feed costs for piglet feeding, veterinary drugs for prevention, and the costs and profitability of piglet rearing in these feeding systems were analyzed. It was found that the use of the liquid milk replacer Opticare Milk helped to improve the survival rate of piglets up to weaning by 7.5 %, increase their number in the sow's nest at this time by 7.0 %, increase the average daily growth of suckling piglets by 20.4 %, increase the absolute weight gain by 19.8 %, increase the weight of the piglet litter at weaning by 22.0 % and increase the individual weight of the piglets at weaning by 14.7 % compared to piglet litters fed dry granulated starter provide Superior Neonatal. Multiple fertility, high fertility, and litter weight of piglets at birth did not depend on how piglets were fed during the suckling period. With liquid feeding of suckling piglets, the proportion of piglets with diarrhea decreased by 12.20 % and the costs for the prevention of gastrointestinal diseases increased by 58.5 %, the costs for the treatment of gastrointestinal diseases by 55.4 %, and the veterinary costs for rearing a piglet during the suckling period by 53.8 % compared to analogs with dry feeding. To 1 kg of gain, these costs increased by 33.1 % due to prevention and 28.4 % due to treatment, resulting in a 28.5 % overrun of the total costs for treatment and prevention. In general, the costs for feeding and medical and preventive measures increased by 157.8 % per animal and 122.2 % per 1 kg of gain compared to dry feeding. At the same time, under the liquid feeding system for suckling piglets, the cost of keeping a sow per weaned piglet fell by 6.00 %. The proportion of these costs per piglet decreased by 21.6 %, and the cost of keeping a sow per 1 kg increased. Still, the cost of a piglet at weaning increases by 13.2 %, the cost of 1 kg live weight of piglets at weaning increases by 5.6 %, the share of feed and veterinary components in the cost of rearing a piglet increases by 9.1 %, and by 3.4 %. At the same time, the market value increases by 14.7 %, the income from rearing a piglet rises by 17.9 %, and the profitability of rearing a piglet increases by 1.95 %.

The article studied the effect of the initial weight of piglets when placed on rearing on their growth intensity, average daily feed consumption and feed conversion, cost indicators of the rearing process, and the cost structure of rearing piglets. It was established that an increase in the initial weight of piglets when placed on rearing by 1.1 kg caused a decrease in the rearing duration by 3.17 %, and when it increased above 8 kg by 15.81 %. At the same time, an increase in average daily gains by 1.76 % and 10.13 % and an increase in the weight of piglets when transferred to fattening was noted by 2.03 % and 2.63 %, respectively. At the same time, it caused a decrease in absolute growth by 1.46 and 7.28 %. With an increase in the weight of piglets when they were placed on rearing, their average daily feed consumption increased by 8.43 and 18.07 %, but feed conversion worsened by 5.43 % and 7.61 %. Feed consumption per piglet during the rearing period did not depend on the initial live weight during rearing. With an increase in the initial live weight of piglets in rearing above 7.0 and 8.0 kg, their value also increased by 6.22 and 19.88 %. Whereas, when transferred to fattening, the cost of one pig in all groups was almost equalized, although it exceeded the cost of animals with less than 7 kg of initial live weight by 2.28 and 2.36 %, respectively. At the same time, the cost of growing one head, on the contrary, decreased by 2.77 and 20.12 %, with an increase in the initial weight when setting up for growth. The cost of rearing piglets that weighed more than 8 kg at birth was 17.84 % lower than the counterparts whose initial weight at rearing was 7–8 kg and by 20.12 % compared to animals whose live weight at the beginning of rearing was less than 7 kg The cost of feed spent on growing one piglet and obtaining 1 kg of growth did not have a clear trend of dependence on the initial live weight of piglets on growing. The share of feed in the cost of rearing one piglet increased with an increase in the live weight of piglets by 2.33 and 9.41 %, while the costs of veterinary care did not depend on the weight of piglets at the beginning of rearing. The weight of piglets at the time of rearing had a probable influence of 14.2 % on the average daily growth but did not significantly affect the preservation of piglets and the cost of their rearing.

The article, a comparative analysis of the productivity of piglets during rearing under a liquid feeding system with fodder mixtures, which were mixed in the feed containers of the Hydro Mix Pro feeding system of the Big Dutchmen company and with the help of the portioned feeding system Spotmix II of the Austrian company Schauer, is made. It was found that the preparation and distribution of feed using the Spotmix II portioned feeding system resulted in 1.5 % better piglet survival, 9.6 % higher piglet growth rate during rearing, 9.5 % higher absolute gains during this period, higher by 7.3 % of the weight of animals when transferred to fattening compared to analogs that were raised on liquid feeding with feed mixing in feed tanks. It has been proven that piglets that were prepared, transported, and distributed feed using the Spotmix II system consumed 6.0 % more feed per day, consumed 7.0 % more during the period, the cost of which was 10.6 % higher. Meanwhile, their feed conversion was 2.3 % better, with almost the exact feed cost per kilogram gain. The feeding of piglets in growing-out using the Spotmix II portioned liquid feeding system led to a 10.6 % higher cost of feed, a 22.1 % higher amortization costs for the equipment for feed distribution and animal feeding, a 9.6 % higher cost of the growing-out process of one pig, and its cost price at the end of the growing period is 3.4 times higher. At the same time, such feeding contributed to higher growth energy of animals during rearing, which caused a 7.3 % higher sales price of piglets, a 17.3 % higher profit from the sale of one head, and a 5.2 % higher profitability of rearing piglets compared to liquid feeding using Hydro Mix Pro system with feed mixing in feed tanks.