Energy requirements of Holstein, Gyr, and Holstein × Gyr crossbred heifers using the respirometry technique - Silvestre, Tainá; Ferreira, Alexandre Lima; Machado, Fernanda Samarini; Campos, Mariana Magalhães; Tomich, Thierry Ribeiro; Pereira, Luiz Gustavo Ribeiro; Rodrigues, Paulo Henrique Mazza; Marcondes, Marcos Inácio (Frontiers in Animal Science, 2022)