Grillo, Gustavo Fernandes, Marco Roberto Bourg de Mello, Ana Luisa Lima Guimarães, Osvaldo de Almeida Resende, Pedro Afonso Moreira Alves, Andressa Ferreira da Silva, Vera Lúcia Teixeira de Jesus, and Helcimar Barbosa Palhano. 2016. “[Dairy Cattle Pregnancy Rate in Fixed Time Artificial Insemination Program With and Without Ultrasonic Gynecologic screening.]”. Brazilian Journal of Veterinary Medicine 38 (2):187-94. https://bjvm.org.br/BJVM/article/view/126.