True or False: MGA is a hormone used as a feed additive to suppress estrus in females.

MGA, or melengestrol acetate, is indeed a synthetic progestin that is used as a feed additive, primarily in beef cattle, to suppress estrus in females. Its role in livestock management is particularly important for producers who wish to control breeding cycles, thus allowing for more synchronized breeding and improved herd management efficiency.

MGA functions by mimicking the effects of the natural hormone progesterone, which is crucial in regulating the reproductive cycle in females. By suppressing estrus, MGA helps prevent unwanted breeding, which can be beneficial for managing herd genetics and optimizing calving times.

This use in female livestock is well established and supported by research demonstrating its effectiveness in enhancing reproductive efficiency. The other options suggest limitations or different demographics where MGA may not apply; however, MGA is primarily recognized for its role in female cattle, affirming that the statement is true.