Ledic, I. L., Sobrinho, E. B., & Tupy, O. (1991). Comparison of methods for estimation of lactation yield, from weekly, biweekly, monthly and bimonthly controls. Pesquisa Agropecuaria Brasileira, 26(8), 1127–1137. https://doi.org/10.1590/S1678-3921.pab1991.v26.3448