If cells do not recognize PTH, a deficiency in calcium occurs which leads to metabolic problems postpartum. The supplementation of anions in prefresh rations is routine on many farms. However, intake is the biggest problem when feeding anionic salts. Traditional anionic salts, such as the ammonium chlorides and sulfates, are not well accepted by cows. High sulfate levels in prepartum rations may even interfere with trace mineral absorption.
Chlorine is the most effective anion in lowering urine pH and, therefore, making blood more acidic.
Any method to use chlorine as the anion in a palatable supplement, in instances where anionic salts are necessary, will be the most beneficial. Conclusion Because of its importance to overall farm profitability, research will continue on how to improve fresh cow performance by increasing peak milk and reducing metabolic disorders postpartum. A nutrient dense diet helps provide needed nutrients when dry matter intake drops prior to calving. The occurrence of metabolic disorders decreases when close-up dry cows are fed diets containing the correct amounts and proportions of needed nutrients and additives. The close-up dry cow diet should help transition cows from dry to fresh cow rations.