Abecia, J.A. Mura, M.C. Carvajal-Serna, M. Pulinas, L. Macías, A. Casao, A. Pérez-Pe, R. Carcangiu, V. Polymorphisms of the melatonin receptor 1A (MTNR1A) gene influence the age at first mating in autumn-born ram-lambs and sexual activity of adult rams in spring 1879-3231] 10.1016/j.theriogenology.2020.07.030 2020 2020