Hampel, Viviane da Silva, et al. “Grazing Behavior of Non-Supplemented and Supplemented Heifers on Italian Ryegrass Pasture”. Semina: Ciências Agrárias, vol. 37, no. 4, Aug. 2016, pp. 2053-66, doi:10.5433/1679-0359.2016v37n4p2053.