Fahmy, S. (2004). 'Concentration of progesterone, estradiol-17B, calcium, phosphorus and CA/P ratio in blood serum of friesian cows during late prefnanct, parturition and postpartum period in upper egypt', Assiut Veterinary Medical Journal, 50(101), pp. 293-303. doi: 10.21608/avmj.2004.178761