Ziziphus spina-christi as a natural feed supplement for sustainable livestock nutrition: An updated narrative review - Youssef A. Attia; Asmaa F. Khafaga; Ayman E. Taha; Islam M. Youssef; Khalid A. Asiry; Adel D. Al-Qurashi; Omer H.M. Ibrahim; Khaled H. El-Kholy; Rashed A. Alhotan; Salem R. Alyileili; Sara H.M. Hassab; Mohamed A. Al-Banoby; et al. (Livestock Science, 2026)