Evaluation of body condition, daily milk production and biochemical parameters during the postpartum period according to calving season in Montbeliard dairy cows reared in the semi-arid region – Algeria

The aim of this study was to evaluate the effect calving season on postpartum changes certain blood metabolites and minerals body condition score evaluation (BCS) in Montbeliard dairy cows reared under semi-arid conditions. Blood samples were collected from 74 clinically healthy 10 semi-intensive Algerian herds once month during a whole year. Animals grouped according occurrence their four different seasons (autumn, winter, spring summer). Albumin, urea, glucose, total cholesterol, calcium, phosphorus magnesium plasma levels analysed using colorometric method adapted each biochemical parameter. One-way repeated measures analysis variance (ANOVA) showed significant (P<0.05, P<0.01 at P<0.001) all parameters, except BCS. highest concentrations urea nitrogen, albumin, recorded summer, though calcium significantly lower period. A negative correlation found between cholesterol winter calving, nitrogen summer calving. results highlight evolutionary pattern electrolytes, BCS daily milk production period season. They provide reliable information assess risk metabolic activity failures these very important productive stages, i.e., open days, ascending peak periods.