The objective of the research study was to assess the effect of ripening conditions on the survival of Lb. casei LOCK 0900 probiotic strain in pork loins and on their sensory quality during 180 days of chilling storage under anaerobic conditions. Also, it was attempted to construct mathematical models of growth and survival of the bacteria studied. The experimental material comprised Lb. casei ŁOCK 0900 probiotic strain and pork loins ripened at varying temperatures (16, 20, and 24 °C) and, next, vacuum packaged and stored at 4 °C for 180 days. Control samples with the addition of glucose and experimental samples with the addition of a probiotic strain and glucose were prepared. The scope of research included microbiological analyses, pH measurement, and sensory evaluation (QDA). The determinations were performed every 30 days. It was found that the best storage stability, both in terms of microbiological and sensory quality, was obtained in the case of loins with probiotic bacteria added, which were produced at 20 °C temperature of ripening (7.00 – 8,00 log jtk/g on average; overall sensory quality > 7 c.u.). A satisfactory model of growth and survival of LAB was constructed for the loins, which ripened at 24 °C (matching at a level of C24 =98 %, P24 = 96 %).