Effects of summer heat stress on physiological variables, ovulation and progesterone secretion in Pelibuey ewes under natural outdoor conditions in an arid region. - Macías‐Cruz, Ulises; Gastélum, Miguel A.; Álvarez, Francisco D.; Correa, Abelardo; Díaz, Raúl; Meza‐Herrera, César A.; Mellado, Miguel; Avendaño‐Reyes, Leonel (Animal Science Journal, 2016)