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Tail fat is present in some breeds of sheep and they use this fat according to their energy requirements. We hypothesized that this fat deposition may interfere with the metabolism of ewes during pregnancy and lactogenesis. Hence, the present study was carried out to clarify the probable effect of tail fat on metabolic and hepatic biomarkers during different preand post-partum periods of fat-tailed in comparison with semifat-tailed ewes. Adult Mehraban (n = 10) and Chios (n = 10) ewes were selected and blood sampling was performed from all ewes at 2 and 4 months after mating, and 1, 2 and 3 months after parturition. Serum concentrations of glucose, total protein, albumin, globulin, aspartate aminotransferase, alanine transaminase, gamma glutamyl transferase, beta-hydroxy acid, non-esterified fatty acids, triglyceride, cholesterol, high, low and very low density lipoproteins, total, direct and indirect bilirubin were assayed in all specimens. Glucose in Chios ewes was significantly higher than in Mehraban at all the times studied. The circulating levels of aspartate aminotransferase, alanine transaminase, gamma glutamyl transferase, triglyceride, cholesterol, high, low and very low density lipoproteins, beta-hydroxy acid and non-esterified fatty acids were significantly higher in Mehraban ewes than in the Chios breed at different preand post parturient periods. The results of the current research revealed that metabolic and hepatic biomarkers alter during the pregnancy and lactation periods in sheep, which reflects the energy demands and metabolic alterations during these periods. Furthermore, it may be stated that the presence of tail fat in Mehraban ewes may alter the metabolic and hepatic functions in this breed. Tail fat may interfere with lipid metabolism and hepatic function during peri-parturient periods and it may be suggested that semi-fat-tailed breeds, such as Chios, may have more intensive metabolic pathways due to lower body fat storages.

Comparison of circulating metabolic and hepatic indices between fat-tailed and semi-fat-tailed ewes in different pre and post-partum periods