Overbred

From HelpWiki

For WOSE players, "overbred" is simply a relative term. Many experienced players do not like to breed their horses more than a certain amount of times. That number of times is usually stated on their main account page. For many players, the “rare breeds” get bred no more than three times per horse, and the other breeds have no more than five foals each. Rare breeds are normally those breeds that have fewer than 50 horses on the site. 

Experienced players know how much work goes into taking care of WOSE horses, therefore, an “overbred” horse doesn't seem to have a great value, no matter what the written value of the horse is on the horse's page.

Some players like to “earn money” by over-breeding, and selling the foals. Many Retirement accounts will buy the foals and retire them early so the population won't crowd the server. Other accounts like to buy the foals, use them as fillers, geld or sterilize them (so they cannot breed) at age 4, then retire them naturally by deleting the horse's pedigree.