Observational analysis showed improved immune response and stable growth in lambs, highlighting the role of essential oils and sugar beet pulp in diet under heat stress.
Dietary supplementation under high ambient temperatures can be considered crucial for supporting immune responses in livestock. In the present paper, Rosmarinus officinalis essential oil (REO) alone and in combination with dried sugar beet pulp (REO + B) was included in the diet of lambs during the fattening period under heat stress conditions. Environmental conditions and physiological and growth parameters of lambs were monitored throughout the trial. Plasma samples were collected to evaluate cytokine secretion (IL-1β, IL-6, and IL-10). Notably, REO inclusion reduced rectal temperature and respiration rate while increasing pro-inflammatory cytokines (IL-1β and IL-6) at the same time, suggesting an enhanced immune response without compromising growth performance.
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Ciliberti et al. (2025) studied this question.
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