Browsing by Author "Silva Gaspata, Silvia Maribel"

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    Bacillus subtilis y calidad del huevo en gallinas en postura tardía: una revisión sistemática
    (Universidad Técnica de Ambato Carrera de Medicina Veterinaria, 2026-07) Silva Gaspata, Silvia Maribel; Núñez Torres, Oscar Patricio
    Physiological aging in late-phase laying hens affects egg quality and represents a challenge for the sustainability of poultry production. To compile available scientific evidence on the use of Bacillus subtilis as a probiotic to improve egg quality in late-phase laying hens. A quantitative systematic review was conducted using information obtained from scientific articles published between 2018 and 2026 in high-impact databases, following PRISMA criteria and search strategies with Boolean operators. Variables related to egg quality, intestinal morphometry, cecal microbiota, and enzymatic activity were analyzed. The analyzed studies showed increased villus height (1343±1045), reduced crypt depth (206±114), and improved villus height/crypt depth ratio (VH/CD) (6.25±1.89); an increase in beneficial bacteria such as Lactobacillus (28%) and a reduction in pathogenic bacteria (40%) such as E. coli, Clostridium, and Salmonella; as well as improvements in eggshell thickness (0.39±0.0373), shell strength (38.6±0.546), egg weight (62.1±4.98), Haugh units (81.3±10.1), and yolk color (7.42±1.96). Supplementation with B. subtilis constitutes a promising strategy to improve the internal and external