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Cal-Mag-Se gel is a nutritional supplement containing 67 grams of calcium, both calcium hydroxide and calcium propionate. Provides fast and sustained release of calcium for dairy cows into the bloodstream. Also contains magnesium, cobalt, selenium and vitamins for dairy cattle during calving. Contains citric acid to aid in absorption of ingredients. Give one tube prior to or after calving and second tube 12 to 24 hours after calving. Requires 3-tab dosing gun (16716) to administer.