Spermidine and melatonin ameliorate heat stress-induced decline in sheep semen quality - Shuqi Zou; Can Wang; Bo Pan; Jianpeng Qin; Yinwei Zheng; Kunlin Du; Yaozong Wei; Ao Ning; Xiangyi Chen; Xiaoyue Xiong; Tao Sun; Xiaohui Su; et al. (Theriogenology, 2026)