Figure 2:Enzymes levels in serum of Danish cows. The mean levels of GLDH in cows at farms K, R, T, B and E were above the reference level of (≤ 30 U/L). Significant differences of the GOT were seen between farm T and B (a/b: p< 0.001) and between farm W and farms K and T (c/d: p<0.001). The reference value of GOT is < 80 U/L. Significant differences of AP were also seen between farm K and T (p <0,001). The reference value of GOT is ≤ 300U/L. No significant differences were seen between CK values however all values were above the postulated reference level (≤ 100 U/L).