Gentil, Narjara Rodrigues, et al. “Validation of Body Condition Score System in Holstein X Zebu Cows via Ultrasound Method During the Transition Period and Early Lactation”. Semina: Ciências Agrárias, vol. 38, no. 6, Nov. 2017, pp. 3797-06, doi:10.5433/1679-0359.2017v38n6p3797.