Undiluted Corid or amprollium can be given as a boost dose once or twice a day at 0.1 ml per pound of weight. But it is always given in the water as well. Dosage is 2 tsp of the Corid liquid or 1.5 tsp of the powder per gallon of water for 5 days. It is found in feed stores in the catrle medicines. Food can be sprinkled with the medicated Corid water if they are eating. I also wonder about the phosphorus suggestion. Did they give it to you or tell you to buy it? Phosphorus is in a lot of foods, and the balance of calcium and phosphorus is important to keep in the right balance.
