ThanhN. V., HangP. T., GioiP. V., ToanN. C., and LongS. T. 2023. “The Relationship Between Plasma Progesterone Concentration on Day 6 After Artificial Insemination and Pregnancy Rate of Dairy Cows in Vietnam”. Tropical Animal Science Journal 46 (2), 146-50. https://doi.org/10.5398/tasj.2023.46.2.146.