Leite, P.R. de M. et al. 2014. Factors influencing gestation length and calving interval of Gir cows under northeast Brazil conditions. Pesquisa Agropecuaria Brasileira. 21, 1 (Apr. 2014), 87–92. DOI:https://doi.org/10.1590/S1678-3921.pab1986.v21.14664.