고온 스트레스 환경에서 사료 내 Limosilactobacillus reuteri 첨가가 모돈의 대사 생리, 면역 반응 및 자돈 성장에 미치는 영향

초록

This study was conducted to evaluate the effects of Limosilactobacillus reuteri supplementation on physiological responses, productive performance, immune responses, and piglet growth in lactating sows under heat stress. Thirty multiparous sows at day 112 of gestation were randomly assigned to one of three treatments: thermoneutral (TN), heat stress (HS), and heat stress with 0.05% probiotic supplementation (HS5). Under heat stress, sows maintained thermal homeostasis through an increased respiratory rate (p<0.05). Heat stress reduced feed intake and increased serum concentrations of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), interleukin-10 (IL-10), and malondialdehyde (MDA), but decreased prolactin concentration (p<0.05). In contrast, the HS5 treatment restored feed intake, attenuated inflammatory responses and oxidative damage, and significantly improved piglet weaning weight (p<0.05). However, hair cortisol concentrations were similar for the HS and HS5 treatments (p>0.05), suggesting that the probiotic effects were mediated through improvements in immune function and gut health. The study shows that dietary supplementation with Limosilactobacillus reuteri may alleviate physiological burden and improve productive performance in sows under conditions of heat stress, and suggests its potential as an effective nutritional strategy.

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