Daudu, O. M., Makun, H., Zechariah, A. J., Titus, G., Oluwa, D. E., Olutunmogun, A. K., Barje, B. P., and Otaru, S. M. “Semen and Testicular Characteristics in Red Sokoto and Sahel Bucks Fed Different Protein Sources”. Tropical Animal Production Investigations, vol. 19, no. 2, July 2025, pp. 09-18, http://journals.ui.edu.ng/index.php/tapi/article/view/1712.