and blood biochemical and immunological indexes of sows were investigated. The
results showed that administration of L. johnsonii XS4 in diets towards the end of pregnancy and
during lactation had positive effects on the performance of sows, increasing litter weight at birth, 20-day
litter weight, the number of piglets at weaning and weaning litter weight, along with a significant
increase in serum IgG levels and a decrease in alanine aminotransferase concentrations [31].