The reproductive organ of a male pig.

Whips generally refer to the reproductive organs of various male animals, such as the male horse's is called a whip; the boar's is called a hogwhip, but the female's reproductive organs cannot be called whips.

Expanded:

Pigs are vertebrates, mammals, domestic animals, and ancient omnivorous mammals. It is divided into domestic and wild pigs. Nowadays, pigs are generally considered to be short for the pig family. Pigs according to the different species, physical characteristics also vary. But usually large ears, long head, straight nose, narrow waist and back as the main physical characteristics. The hair is coarse and hard, and depending on the breed, it is divided into white, pink, black, brown and fancy colors.

The domestic pig is a subspecies of wild boar that was domesticated by humans, with shorter tusks than the wild boar, and is one of man's domesticated animals; in general, a domestic pig is a species of pig that is kept by humans for more than one meal.

History:

The history of the pig goes back 40 million years, and there are indications that the domestic pig may have come from Europe and Asia. There is evidence of wild boar-like animals traveling through forests and swamps, among other things, in fossils that have been discovered by people.

Wild boars were first domesticated in China, where the history of pig farming dates back to the early to mid-Neolithic period. Pre-Qin Period According to oracle bone inscriptions unearthed in Yinxu, pigs were already housed during the Shang and Zhou Dynasties. Later, with the development of production, the requirement of differentiating between different pigs gradually arose, and one of the major creations of pig rearing technology in the Shang and Zhou era was the invention of castration technology.

With the development of agricultural production in the Han Dynasty, pigs were raised not only for food, but also for fertilizer. This situation promotes the change of pig rearing methods. Before the Han Dynasty, although there has been feeding, but until the end of the Han Dynasty, grazing is still the main way of raising pigs. At that time in the identification of pig breeds is known to the relationship between the physiological functions of the pig and the external form, which played a great role in the Han Dynasty selection and breeding of good pig breeds Wei Jin and the North and South Dynasties period of this period, the combination of housed feeding and grazing feeding gradually replaced the grazing-based feeding methods.

With the development of pig breeding and the continuous progress of economy and culture, the experience of pig breeding is getting richer and richer. Tang and Song Dynasties In Sui and Tang, pig raising had become an important means of increasing farmers' income.

Yuan and Ming Dynasties The Yuan Dynasty had many creations in expanding the sources of pig feed. The middle of the Ming Dynasty, the pig industry had suffered serious damage, Zhengde fourteen years (1519), because the "pig" and the Ming Emperor Zhu surname homophonic, was ordered to prohibit breeding, between ten days, near and far all killed, some of them are sold cheaply at a reduced price or be buried and abandoned. But the ban on pigs did not last long, some breakthroughs in pig technology such as pig breed identification and rearing methods and other achievements.

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