[English name] Bull frog

[Local name] Hustling frog, edible frog.

Frogs (Ranidae, or red frogs) animals, scientific name Rana catesbeiana. solitary aquatic frogs, because of its big call and so named, bellowing sound like a bull, so the name bullfrogs, for North America's largest frogs. It is the largest frog in North America. It is native to the eastern states of the United States and has been introduced to the western states and other countries. Some other large frogs are also called bullfrogs, such as the boxhead frog (R. adspersa or Pyxicephalas adspersa) in Africa and the tiger frog (R. tigrina) in India, as well as the fine-toed toad family (Leptodactylidae) in South America. Bullfrogs have a green or brown body with a white to yellowish abdomen and black stripes on the limbs. The body is about 20 centimeters (8 inches) long, with hind limbs up to 25 centimeters (10 inches) long. Large adults weigh more than 0.5 kg (1 lb). They often live in or near still water. Breeds in the spring and lays eggs in the water. Tadpoles are greenish brown with dark spots. The tadpole stage lasts 1?6?53 years, depending on climatic conditions. Many bullfrogs are eaten or used as experimental material.

Bullfrogs are native to the Rocky Mountains of North America, and were introduced to China in 1959 and raised in large numbers in central and southern China in 1986. The main species include: swamp green bullfrogs, western bullfrogs, Indonesian bullfrogs, African bullfrogs, and large African bullfrogs.

A. Morphology of bullfrogs:

The bullfrogs are large and stout, and the adult frogs are 20 centimeters long and weigh up to 1 kilogram. The back of the body is greenish-brown with dark brown spots, the abdomen is grayish-white, and the pharynx of male frogs is yellowish-skinned with rough skin.

B, the breeding value of bullfrogs:

Bullfrogs are large and fat, is the world's famous meat frogs, especially the frog legs in the international market is very popular, bullfrogs, in addition to for people to eat, the frog skin can be made of tannery, processed leather after dyeing, can be made of fine leather shoes, handbags and gloves, and so on.

Morphological features edit this section of the body shape and general frogs, but the individual is larger, the female frog body length of up to 20 centimeters, male frogs 18 centimeters, the largest individual up to more than 2 kilograms. The head is broad and flat. The mouth is terminal, and the muzzle is rounded and blunt. The eyes are protruding, divided into upper and lower parts, and there is a crepeable transient membrane on the lower eyelid, which can close the eyes. Dorsum slightly rough, with fine skin ribs. The limbs are stout, the forelimbs short and without webbing. Individual males have a conspicuous gray verrucous protuberance on the inner side of the first toe. The hind limbs are larger and webbed between the toes. Skin color varies with the living environment, usually greenish brown on the back and limbs, with dark brown markings on the back; bright green on the head and mouth margins; white on the ventral surface; the color under the throat varies with the male and female, with females mostly white, gray, or dark gray, and males golden yellow. It is named after its loud sound, which sounds like a cow's cry from afar.

Place of origin, season of production edit this paragraph is native to North America. 1959 from Cuba, Japan introduced to our inland. At present, our country mainly rely on breeding production, all over the country are produced, mainly concentrated in Hunan, Jiangxi, Xinjiang, Sichuan, Hubei and other places. Commercial frogs are mainly in the fall and winter.

Economic value of editing this section of the bullfrog has a fast growth, delicious flavor, nutritious, high protein content, is a valuable food. It can also be exported for foreign exchange. Its skin can also be leather, dirty medicine. Bullfrog fast-growing, tender meat, delicious flavor, is low-fat high-protein high-level nutritional food. Frog skin can be made of high-grade leather, its turf is thin, soft, tough, is the manufacture of high-quality wallet materials. It is an excellent raw material for belts, ties, shoes, musical instruments and surgical threads. Frog entrails can be used medicinally, and frog oil can be made into high-grade lubricant.

Medicinal value edit this section of the bullfrog nutrition bullfrog is very rich, delicious flavor. Each 100 grams of frog meat contains 19.9 grams of protein, 0.3 grams of fat, is a high protein, low fat, low cholesterol nutritious food, is very popular.

Bullfrog also has the effect of nourishing and detoxification, people with poor digestive function or excessive stomach acid and people with weak physique can be used to nourish the body. Bullfrogs can promote the body's qi and blood, energetic, nourishing yin and yang, and have the effect of nourishing the heart and tranquillizing the spirit to replenish the qi, which is conducive to the recovery of the patient.

The guts of bullfrogs and their scraps are rich in protein, which is hydrolyzed to produce complex amino acids. Among them, spermine acid, high content of ionine, is a good food additives and tonic. The hydrolyzed compound amino acid, after separation and purification, is used in medicine and cosmetic industry. The endocrine system of bullfrog secretes various hormones, which can be used in medicine, industrial production and scientific research after extraction, such as pituitary hormone used as artificial catalytic agent for fish and amphibians, which is beneficial to artificial reproduction. Gastric glands, intestinal glands and pancreas of bullfrogs are rich in digestive roc, especially hydrolyzed protein roc content is high, can be extracted and utilized. The bile of bullfrog can be extracted and processed for medicinal use. Frog skin can be made into excellent raw material for surgical thread. Frog oil can make high-grade lubricating oil