The low fertility of repeat-breeder cows during summer heat stress is related to a low oocyte competence to develop into blastocysts - Ferreira, R. M; Ayres, H; Chiaratti, Marcos Roberto; Ferraz, M. L; Araujo, A. B; Rodrigues, C. A; Watanabe, Y. F; Vireque, Alessandra Aparecida; Joaquim, Daniel Carlino; Smith, Lawrence Charles; Meirelles, Flávio Vieira; Baruselli, Pietro Sampaio (Journal of Dairy Science, 2011)