USUAL VALUES FOR SEVERAL BIOCHEMICAL PARA METERS OF ENERGETIC METABOLISM OBSERVED IN A LIMOUSINE COWS HERD - FACTORS OF VARIATION

In this study, we assessed the variations of five metabolites, e.g. gl ucose, urea, non-esterified fatty acid, beta-3-hydroxybutyrate, glycer ol in a Limousine cows' herd of a traditionnal breeding unit. Blood gl ycaemia was steady-state (around 0,66 g/l) according to the physiologi cal stage and feeding conditions. The concentrations of urea, non-este rified fatty acids, beta-3-hydroxybutyrate and glycerol were maximum d uring the last month of pregnancy, during the first month of suckling, and when feedind conditions were impaired.