Pet Medications

Ivy Laboratories, Division of Ivy Animal Health, Inc.

8857 Bond Street

Overland Park, KS    66214
USA

Lasalocid

Melengestrol Acetate

Cattle, beef, heifers fed in confinement for slaughter

Per Os

Medicated feed

Type A Medicated Article

OTC

Not required

558.342 Melengestrol acetate.

Specifications Liquid Type A article containing 500 milligrams per pound.

Conditions of use

Cattle (heifers)

Amount Melengestrol acetate, 0.25 to 0.50 milligram per head per day in combination with lasalocid (as lasalocid sodium), 100 to 360 milligrams per head per day. To attain this amount: Add at the rate of 0.5 to 2.0 pounds per head a medicated feed (liquid) containing 0.125 to 1.0 milligram of melengestrol acetate per pound to a feed containing 10 to 30 grams of lasalocid per ton; or, 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 plus 50 to 720 milligrams of lasalocid per pound to a ration of non-medicated feed to provide 0.25 to 0.5 milligram of melengestrol acetate and 100 to 360 milligrams of lasalocid per head per day.

Indications For increased rate of weight gain improved feed efficiency, and suppression of estrus (heat).

Limitations For heifers being fed in confinement for slaughter.

Tolerances for lasolocid residues are established as follows:

1. Cattle: The tolerance for parent lasalocid (the marker residue) in liver (the target tissue) is 0.7 part per million 2. Chickens: (I) Skin with adhering fat (the target tissue). The tolerance for parent lasalocid (the marker residue) is 1.2 parts per million. (ii) Liver. The tolerance for parent lasalocid (the marker residue) is 0.4 part per million. 3. Turkeys: (I) Skin with adhering fat (the target tissue). The tolerance for parent lasalocid (the marker residue) is .4 part per million. (ii) Liver. The tolerance for parent lasalocid (the marker residue) is 0.4 part per million. 4. Rabbits: The tolerance for parent lasalocid (the marker residue) in liver (the target tissue) is 0.7 part per million. 5. Sheep: The tolerance for parent lasalocid (the marker residue) in liver (the target tissue) is 1.0 part per million

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