Samer Nadhim Abed, and Najlaa Sami Ibrahim. “Clinical Study of Estrus Appearance Time, Duration of Estrus and Effect of Temperature and Lighting Hours on Estrus in Iraqi Mares”. International Journal of Biological Engineering and Agriculture, vol. 2, no. 6, June 2023, pp. 40-45, doi:10.51699/ijbea.v2i6.2041.