Aditivos à base de levedura para fêmeas suínas em condições de clima tropical: efeitos sobre as matrizes e progênie

Abstract

In tropical swine production systems, hyperprolific sows are exposed to important physiological challenges, especially during late gestation and lactation. During these stages, changes in feed intake, body reserve utilization, and nutrient allocation can directly affect sow and litter performance. In this context, nutritional strategies involving dietary fiber and yeast-based additives have been investigated as alternatives to improve the metabolic adaptation of sows under heat stress conditions. This study aimed to evaluate the effects of supplementing diets with Saccharomyces cerevisiae var. boulardii CNCM I-1079, either alone or in combination with hydrolyzed yeast, within a standardized soluble-to-insoluble fiber ratio, on sow productive performance, feed intake kinetics, metabolic responses, intestinal fermentation, milk composition, and litter performance. A total of 60 TN70® sows were assigned to a randomized block design with three treatments: basal diet (BD), BD supplemented with S. cerevisiae (BD + Sc), and BD supplemented with S. cerevisiae associated with hydrolyzed yeast (BD + Sc + HY). Evaluations were carried out from day 70 of gestation until day 24 of lactation. During gestation, supplementation with Sc + HY was associated with a greater satiety pattern in sows and with the maintenance of larger litters at birth, although piglets showed lower average birth weight. During lactation, supplementation with Sc alone favored greater body reserve mobilization, improved maternal transformation efficiency, and better individual piglet performance. In contrast, the association between Sc and HY reduced maternal body reserve losses, but was associated with lower milk lipid content and reduced individual litter performance. Overall, the results demonstrate that the evaluated additives mainly influenced how nutrients were allocated between the sow and her progeny, highlighting a balance between maternal body preservation and litter performance under heat stress conditions.