THE INFLUENCE OF THE HYPOXIA ON THE INTES TINAL-ABSORPTION OF COLOSTRAL IMMUNOGLOBULINS IN NEWBORN CALVES

Eighteen Holstein calves were used. They were divided into two groups of nine animals for stydies on the influence of hypoxia on the saturat ion Of Oxygen of venous blood (SO2Hb), pH and intestinal absoption of G1 immunoglobulins (IgG1). The test group (TG) and the hypoxic (HG) on e presented live weight of 44+/-2,4 and, 45,4+/-2,3kg, respectively. T he HG group was submitted to hypoxia from 30 minutes to 4th hours afte r birth. Hypoxia on the animals was induced by an oxygen mask which li berated a gase misture containing 8.5% oxygen and 91.5% nitrogen. Bloo d was collected at 0, 0.5, 1.5, 2, 3, 4, 4.5, 5, 6, 7, 8, 10, 13, 17, 25, 29 and 32 hour after birth for determination SO2Hb, pH and IgG, le vels. The animals were fed on 25 g of colostrum/kg/LW at 6, 13 and 25 hours of life. In the GT group SO2Hb increased (P<0.05) between birth and 12 hours of life; in the HG group the levels of SO2Hb decreased to 10% 30 min after biginning of hypoxia and in those low levels during the hypoxia period. In the HG group the pH decreased (P<0.05) and reac hed 7,01 in the 4th hour after birth. The ingestion of colostrum cause d a rise in the plasmatic levels of IgG1. However, the levels in the T G group were higher (P<0.05) than those of HG group,