Chanapiwat, P., Kaeoket, K., & Tummaruk, P. (2013). Distribution of Spermatozoa in the Reproductive Tracts of Sows after Intra-uterine Insemination Using Frozen-thawed Boar Semen. The Thai Journal of Veterinary Medicine, 42(3), 359–366. retrieved from https://he01.tci-thaijo.org/index.php/tjvm/article/view/10995