Serrano-Díaz, G. and Villa-Mesa, O. 2019. Effect of some factors of the production model and the lunar phases on the duration of gestation and sex of the bovine calf. Spei Domus. 15, 30-31 (Nov. 2019), 1–20. DOI:https://doi.org/10.16925/2382-4247.2019.01.02.