This article describes the assessment of immunoglobuline (Ig) G concentration in the colostrum of Belgian bluebeef cows and an investigation of its association with serological status against helminth infections (i.e. Ostertagiaostertagi and Fasciola hepatica). In the discussion, we go more deeply into cow-related factors and environmentalfactors that are known to influence the bovine colostrum quality. Colostral Ig G concentrations were measured in 103cows and showed great variation: the majority of the colostra studied had a low (≤ 25 mg/ml; 36%) or moderate (26-50 mg/ml; 31%) concentration, and only 33% had a concentration which is considered to represent a colostrum ofhigh quality (> 50 mg/ml). This variation was not significantly related to the serological status against helminthinfections. Factors with known influence on bovine colostrum quality can be divided into cow-related factors (age,genetics, disease), seasonal factors, climate factors and management factors (lactation and dry-off management, feed,temperature and administration of hormones and vaccines). Knowledge of these factors can be used to improvecolostrum management in cattle farms.