اثر سطوح مختلف كاتيون آنيون جيره ، در دوره آبستني سنگين ، بر روي ناهنجاري هاي متابوليكي و تركيبات خون گاو هاي هلشتاين

Effect of dietary cation-anion balance in last two months of pregnant on metabolic disorders and blood metabolites of holstein cows

This experiment was carried out in order to investigate the effect of feeding cow with different of dietary cation-anion balance(DCAB) in far-off and close-up period, on metabolic disorders and blood metabolites of Holstein cows in pregnancy and fresh periods. In this study 18 Holstein pregnant cows (220-225 d) were fed individually, a base diet with three different DCAB (+13(control), 0 and -13 mEq [(Na+K)-(Cl+S)]/100g dry matter) for 60±5 days. For decrease DCAB two anionic salts (ammonium chloride and ammonium sulphate) were used. The result indicated that a milk fever percentage was affected by diets. Among blood compositions Mg (2.1, 1.4 and 2.4 for diet +13, 0 and -13 mEq/l00g DM, respectively) affected by diets. Urinary pH of cows was affected by diets. Urinary pH increased linearly with increasing DCAB. The mean urinary pH was 7.99(for diet +13), 6.81(for diet 0) and 6.1 l(for diet -13). Also blood compositions of calve including protein (7.99, 6.81 and 6.11 mg/dl), Mg (2.13, 1.47 and 2.53 mg/dl) Cl (108, 83.33 and 106 mg/dl) was affected by diets.