Herwinda, F. A. ., S. Sugiharto, and D. Samsudewa. “Meta-Analysis: The Effect of Using Fertility Hormones With Single Ovulation Synchronization and Double Ovulation Synchronization Methods on Reproductive Traits in Dairy Cows”. Journal of Advanced Veterinary Research, vol. 16, no. 1, Jan. 2026, pp. 135-40, https://advetresearch.com/index.php/AVR/article/view/2470.