Horse breed been produced. Such restrictions have led to legal challenges in the United States, sometime based on state law and sometimes based on antitrust laws. Horses can crossbreed with other equine species to produce hybrids. These hybrid types are not breeds, but they resemble breeds in that crosses between certain horse breeds and other equine species produce characteristic offspring. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, the hinny, is a cross between a stallion and a jenny (female donkey). Most other hybrids involve the zebra (see Zebroid). With
Donkey burger to eat horse meat; however, since horses were a valuable resource, common people substituted donkey meat and considered it tastier. Donkey burgers became popular towards the end of the Qing dynasty after the Beijing-Hankou railway line was built, as donkeys were no longer needed to transport goods in and out of Beijing. When departing from Beijing, Baoding is the first major city on the Beijing-Hankou railroad. The traditional freight industry was hit particularly hard there, and as a result, donkey burgers became most popular in Baoding. Donkey burger The donkey burger () is a kind of sandwich commonly eaten in