“…When feeding the probiotic supplement "Sgol-1-40" included in the diet of lactating sows, the number of red blood cells increased by 18.1 % and 32.1 %, white blood cells by 24.5 and 35.5 %, hemoglobin by 15.3 % and 24.1 %, respectively, relative to similar indicators in the control group of animals. Administration of hydrolyzed serum to sows in doses of 2.5 % and 3.5 %, caused a significant increase (P≤0.05) in almost all studied biochemical blood parameters, in particular, total protein by 42.9 and 52.9 %, glucose by 48.5 and 68.5 %, inorganic phosphorus by 30.4 and 40.1 % compared to the control group The research data are consistent with the results of other studies [25][26][27][28]. In particular, the supplementation of the probiotic preparation "Intestevit" to sows in the prenatal period and after farrowing has a positive effect on erythropoiesis, morphological and functional state of the liver and biochemical status, which was demonstrated by an increased number of red blood cells by 10.9 %, hemoglobin -by 9.2 %, total protein -by 2.3 %, albumin -by 3.2 %, globulin -by 7.8 %, glucose -by 7.1 %, total calcium -by 3.8 %, and tends to have a beneficial effect on productivity, which is noticeable in increased milk production -by 5.3 %, the average daily gain by piglets by 7.8 % and their survival rate by 5.6 % [28].…”