Samer Nadhim Abed and Najlaa Sami Ibrahim 2023. 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. 2, 6 (Jun. 2023), 40–45. DOI:https://doi.org/10.51699/ijbea.v2i6.2041.