Toniollo GH, Vicente WRR, Oliveira CA de, Cippola Neto J. Evaluation of thyroxine (T4) and progesterone-17-alpha-OH circadian rhythm in swine females (Sus scrofa domestica - Linnaeus, 1758). Braz. J. Vet. Res. Anim. Sci. 1998;35(4):195-197. doi:10.1590/S1413-95961998000400010