VIANA, C. H. C.; SILVEIRA, P. R. S. da; MORETTI, A. S.; RODRIGUES, P. H. M. Relationships between the characteristics weaning-to-estrus interval, estrus duration and moment of ovulation by ultrasonography in sows. Brazilian Journal of Veterinary Research and Animal Science, [S. l.], v. 36, n. 4, p. 212-218, 1999. DOI: 10.1590/S1413-95961999000400008. Disponível em: https://www.revistas.usp.br/bjvras/article/view/5749. Acesso em: 25 sep. 2022.