Aliasghar Chalmeh, Dvm, Phd | Mehrdad Pourjafar, Dvm, Phd | Khalil Badiei, Dvm, Phd | Abdolah Mirzaei, Dvm, Phd | Mohammad Mazrouei Sebdani, Dvm | Iman Saadat Akhtar, Dvm | Mohammad Hadi Zarei, Dvm | Hamed Akbarpour, Dvm
Information regarding the physiologic effects of pregnancy, parturition and lactogenesis on heart electrical activities in sheep can aid in better understanding of the status of the cardiovascular system and performance of these animals. Five adult clinically healthy Ghezel ewes were selected at four weeks before parturition. Electrocardiography and blood sampling were performed in ewes: at four and two weeks before parturition; two and four weeks after parturition; and two, three and four months after parturition. Serum concentrations of sodium, chloride, potassium, calcium, magnesium, phosphorus, aspartate aminotransferase, alanine transaminase and lactate dehydrogenase were assayed in all specimens. The R and T amplitudes increased significantly from four weeks before parturition to two weeks after parturition, and decreased at three months after parturition (P<0.05). RR interval at pre-parturition periods was significantly shorter than at post-parturition (P<0.05). Serum concentrations of all the parameters were significantly lower at pre-parturition periods than at post-parturition. The results of the study suggest that physiological changes in electrocardiographic parameters, serum electrolytes and enzymes values occur during the peri-parturient stage of Ghezel ewes.