Abd Ellah, Mahmoud R., Keiji Okada, Shinsuke Shimamura, Saori Kobayashi, Reeko Sato, and Jun Yasuda. 2015. “Comparison Between Serum and Saliva Biochemical Constituents in Dairy Cows During Lactation and Dry Period”. Journal of Advanced Veterinary Research 5 (3):143-50. https://www.advetresearch.com/index.php/AVR/article/view/57.