peripheral blood leucocytes obtained when the calves were 42 and 56 days of age were significantly less efficient in phagocytosing and killing s. aureus than those obtained when the same calves were less than 1 , 14 , 28 , 70 and 84 days of age ( p less than 0.001 ) .
C0229664
peripheral blood
C0023516
leucocytes