Study on the effect of left displacement of abomasum (LDA) on some serum minerals and biochemical changes in dairy cows

Minerals and some biochemical parameters measured by blood serum analyses in dairy cows affected with left displacement of abomasum (LDA) to evaluate the effect of disease on mineral status, energy metabolism and liver function in animals. Samples were collected from 60 affected cows and 60 healthy control cows, based on herd, parity, and stage of lactation. Serum concentrations for nonesterified fatty acids (NEFA), β-hydroxybutyrate (BHB) and aspartate aminotransferase (AST) were significantly higher in cows with LDA as compared with control cows (P 0.05), whereas serum calcium concentration in cows with LDA was lower than in control group (P 0.05). Parity number and lactation had significant effect in energy metabolism and liver function of LDA-affected cows. Significant increases in mean serum concentrations of NEFA, BHBA and AST were observed in DA cows with three or more lactations compared with healthy control cows (P 0.05).