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This study aimed to evaluate the effect of milk feeding using milk replacer (MR) or natural ewe's milk (NEM) for Lacaune lambs on performance, protein and lipid metabolism and oxidative/antioxidant status. These parameters were evaluated during the period of feeding adaptation, which corresponded to 12 days after ewe's separation. Fifteen lambs were selected and divided into two groups: Group A (n = 7) with lambs receiving natural milk; Group B (n = 8) with lambs receiving a milk replacer. Liquid food supply, for both groups, was set according to their body weight, given in two daily periods. Feed intake was also obtained by individual body weight and adjusted according leftovers. Blood samples were collected on three different days (0, 6 and 12) to perform the serum analysis of total protein, albumin, cholesterol, triglycerides, alanine aminotransferase (ALT) and urea. Additionally, the oxidative profile was analysed in sera samples through the assessment of TBARS (reactive substances thiobarbituric acid) and ROS (reactive oxygen species) which aims to identify lipid peroxidation and free radical levels, respectively, as well as the antioxidant profile evaluating glutathione S-transferase (GST). There was no statistical difference (p > 0.05) between groups on levels of total protein, albumin and globulin. However, cholesterol (day 6), triglycerides (days 6 and 12), urea (day 6) and ALT (day 12) levels differed (p < 0.05) between groups. Values of total protein, globulin, ALT and TBARS differed (p < 0.05) along the time. The average weight gain and body weight differed (p < 0.05) only on day 12, showing that weight gain was higher for lambs fed with NEM. The performance of lambs fed with MR was impaired. Biochemical parameters had a slight variation between groups and along the time, as well as oxidative/antioxidant status did not change in the different liquid diets.

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The main objective of the present study was to evaluate the biochemical profile of the Lacaune ewes naturally infected by gastrointestinal parasites in the pre-and postpartum period. Ewes with similar age and weight, primiparas in the final stage of gestation, totaling 24 animals were selected. Sampling days were 10 and 2 for pre-partum and 2, 6, and 12 days for post-partum to evaluate total proteins, albumin, globulin, cholesterol, triglycerides, and urea levels, in addition to thiobarbituric acid reactive substances (TBARS), reactive oxygen species (ROS), and glutathione S-transferase (GST). Fecal examination by McMaster method was performed during bleeding, and based on the number of eggs per gram of feces (EPG), the animals were divided into two groups: A (sheep with EPG <1000) and B (sheep with EPG >1000) to evaluate the effect of the parasitic load. Statistical analyses of biochemical parameters and EPG were performed taking into account groups, evaluated each time of sampling and over time, as well as without considering the groups, comparing pre-and post-partum and over time. It was possible to verify that the influence of time had a significant (P < 0.01) impact on cholesterol, triglycerides, total proteins, albumin, globulin, TBARS, and GST specifically among sampling time. When time of collection was considered, there were some differences between groups A and B for the variables: triglycerides (day 6 post-partum) and globulin (day 2 pre-partum). It is concluded that the parasitic load did influence seric levels of the urea, triglycerides, and globulins on a determined time.

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