Suivi des modifications hormonales et biochimiques chez la vache laitière au cours de la gestation et en post-partum

Abstract

The aim of this study is to determinate the usual values of some biochemical and hormonal parmeters during the gestation and during the period of post partum, in order to help practitioners to use this paraclinic tool. A second objective is to study the effect of the physiological stage on certain blood metabolites in dairy cattle. The present research was conducted on 10 cows, of Prim Holstein breed aged from 3 to 5 years, clinically healthy, multiparous, from two dairy farms located in the wilaya of Constantine. Samples were realized at different physiological stages (beginning, middle and end of gestation, prepartum, a day after calving and a month post partum). These samples focused on the assay of certain biochemical parameters (urea, creatinine, albumin, total proteins, cholesterol, calcium and phosphorus) and hormonal parameters (progesterone, oestradiol, prolactin) Uremia, albunemia, proteinemia, cholesterolemina, calcemia, progesteronemia as well as the plasmatic concentration of oestradiol varied significantly (p<0.01). The plasmatic concentrations of creatinine showed slight variations (p=0,198 > 0,01), whereas those of prolactin did not show any variation (p=0,41 >0.05). The obtained results on the base of blood parameters (biochemical and hormonal), indicate the necessity to monitor the metabolic profile of animals, in order to determinate the nutritive state, and to take preventive measures towards health troubles to increase the productivity.