MGA Supplemental Label Leads to Increased Ration Flexibility

November 8, 2009 06:00 PM

The U.S. Food and Drug Administration Center for Veterinary Medicine recently granted a supplemental label for MGA® 200 (melengestrol acetate) Premix and MGA® 500 Liquid Premix to be fed at a higher level with Rumensin® (monensin). The new label approval allows for MGA to be fed with Rumensin at a maximum rate of 0.5 mg/head/day with the maximum daily rate of Rumensin at 480 mg/head/day in Type C final mixed rations. At this time, this new higher level combination approval is not approved to be used in Type B supplement dry or liquid feeds.

The previous combination label allowed a maximum daily rate of 0.4 mg/head/day of MGA with a maximum amount of Rumensin set at 360 mg/head/day. The new combination approval provides nutritionists and cattle feeders with increased flexibility in designing heifer feeding programs. MGA is used as a heifer management tool by reducing estrus incidence and improving animal productivity. 

"This new label allows tremendous flexibility for feedlot nutritionists,” said Gary Sides, PhD, Pfizer Animal Health cattle nutritionist. "Nutritionists prefer to use the higher amount of Rumensin in rations and this new label claim allows MGA to be included at any amount up to 0.5 mg per head per day. This is a great advantage when feeding heifers.” 

MGA 200 and MGA 500 are the only melengestrol acetate products approved to be fed with the higher level of Rumensin. For more information contact your local Pfizer Animal Health representative or animal health supplier. 

Pfizer Animal Health, a business of Pfizer Inc (NYSE: PFE), is a world leader in discovering and developing innovative animal prescription medicines and vaccines, investing an estimated $300 million annually. Beyond the U.S., Pfizer Animal Health also supports veterinarians and their customers in more than 60 countries around the world. For more information on how Pfizer works to ensure a safe, sustainable global food supply with healthy livestock and poultry, or how Pfizer helps companion animals and horses to live longer, healthier lives, visit

Back to news


Spell Check

No comments have been posted to this News Article

Corn College TV Education Series


Get nearly 8 hours of educational video with Farm Journal's top agronomists. Produced in the field and neatly organized by topic, from spring prep to post-harvest. Order now!


Market Data provided by
Brought to you by Beyer