MGA feed pellets are an orally administered progestin that suppresses estrus and prevents ovulation, making them an invaluable aid for producers looking to regulate heat during artificial insemination programs.
Studies examining the cost-effectiveness of MGA have had mixed results. In one such trial, heifer calves were randomly allocated to one of two experimental groups upon arrival at a feedlot and monitored until slaughter.
Contents
Cost-Effectiveness
Mga feed pellets may be the more cost-effective choice for commercial cattle producers compared to other feed pellets. Made from compacted rice husk from crop growing fields, they contain similar energy content as wood pellets but are made from a waste product – making them more eco-friendly in the process.
Furthermore, they are more cost-effective than wood pellets and can be compacted on site using simple machinery. Furthermore, they provide a good source of carbon dioxide (CO2), which is essential for animal welfare and environmental sustainability.
The advantages of feeding MGA in a large-pen commercial feedlot production system include improved animal health, increased productivity, and more efficient carcass handling and processing. A study of 6,011 heifer calves raised under standard commercial feedlot production systems in western Canada tested these variables’ effects on these variables. Results revealed that adding 0.4 mg/animal of MGA to complete rations significantly improved animal health, growth rate, and carcass characteristics.
Efficacy
MGA feed pellets have been demonstrated to increase rates of gain and reduce heat stress in feedlot heifers. Furthermore, they appear to promote improved fertility by decreasing estrus-associated riding behavior.
MGA is available as a granular supplement, liquid supplement or dry hay mix that contains 0.4 mg of the hormone per head daily. Depending on your feeding program and herd species, you should adjust the amount of MGA fed accordingly.
A Canadian large-pen study demonstrated that adding MGA to heifer calves receiving trenbolone acetate (TBA) implants decreased initial UF treatment and bone marrow failure mortality; however, the difference was unlikely due to chance alone.
A barley-based pellet containing 0.4 mg of MGA was formulated into a complete feedlot diet and compared with controls fed control diets that did not contain the pellet. The MGA group received their diet in place of an equal amount of dry-rolled barley in their ration composition for at least 24 hours prior to slaughter.
Safety
Melengestrol acetate (MGA) is a synthetic progestin that suppresses heat and prevents ovulation in dairy and beef cattle. It’s an affordable, safe option for synchronizing estrus cycles in these breeds.
MGA is a safe and effective progestin that has been used in cattle for decades without any adverse reactions. Additionally, it’s an affordable choice to use when synchronizing estrus in heifers; studies have even demonstrated that MGA increases rate of gain by 10% and feed conversions by 6.5%.
The only potential drawback to using MGA is that it may lead to twins if fed incorrectly or insufficient amounts. To prevent this issue, ensure your heifers have ample bunk space for optimal intake.
Participating institutions must adhere to stringent data collection and reporting protocols as prescribed by the Food and Drug Administration (FDA). Furthermore, Purina Mills LLC was granted permission by FDA to manufacture MGA-treated herbivore pellets for this project under their existing INAD on file with them.
Dosage
MGA is typically fed at a rate of 0.5 mg/animal/day in one single feeding, though this may differ among protocols. Whether it’s taken as part of a grain or protein supplement, top-dressed onto other feed, or batch mixed with larger quantities, it’s essential that heifers consume the correct amount of MGA to suppress estrus and increase synchronization response rates.
Furthermore, to ensure consistent doses of MGA throughout a 14-day feeding period, Patterson notes that heifers must have ample bunk space.
As such, the FDA requires all medicated diets to be manufactured under an INAD (Investigative New Animal Drugs, 21 CFR 511.1(a)). Purina Mills LLC was granted permission by the FDA to manufacture MGA-treated herbivore pellet for this project under their existing INAD on file with them.
