Forgastrin Oral Powder Dosage and administration Administer three times a day as a drench in water or mixed with a little feed. Calves: 1 to 2 tablespoonfuls (15 to 30 g) Cattle: 3 to 4 tablespoonfuls (45 to 60 g) Pigs: 2 to 3 teaspoonfuls (6 to 10 g) Piglets: Mix 3 teaspoonfuls (10 g) with 60 ml of water; administer 5 ml daily.