558.342 Melengestrol acetate.

Specifications: Dry Type A medicated articles containing 100 or 200 milligrams per pound or liquid Type A article containing 500 milligrams per pound.

Conditions of use:

Cattle (heifers in confinement fed for slaughter)

Amount: Melengestrol acetate, 0.25 to 0.50 milligram per head per day, plus oxytetracycline, 75 milligrams per head per day.

Indications: For increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat, and reduction of liver condemnation due to liver abscesses.

Limitations: Add at the rate of 0.5 to 2.0 pounds per head per day a medicated feed (liquid or dry) containing 0.125 to 1.0 milligram of melengestrol acetate per pound to a feed containing 6 to 10 grams of oxytetracycline per ton; or add at the rate of 0.5 to 2.0 pounds per head per day a dry medicated feed containing 0.125 to 1.0 milligram of melengestrol acetate plus 37.5 to 150 milligrams of oxytetracycline per pound to provide 0.25 to 0.5 milligram of melengestrol acetate and 75 milligrams of oxytetracycline per head per day. Liquid melengestrol acetate may not be mixed with oxytetracycline in a common liquid feed supplement.

Beef cattle, dairy cattle, calves, swine, sheep, chickens, turkeys, finfish and lobster. Tolerances are established for the sum of residues of the tetracyclines including chlortetracycline, oxytetracycline, and tetracycline, in tissues and milk as follows: a. 2 parts per million (ppm) in muscle b. 6 ppm in liver c. 12 ppm in fat and kidney d. 0.3 ppm in milk.

A tolerance of 25 parts per billion is established for residues of the parent compound, melengestrol acetate, in fat, of cattle.