The trunks and limbs of the two Chinese black pigs are white, with head, neck, buttocks and tails black, 2 to 3 cm wide halos at the black and white junction, and a small white hair on the forehead called the pen flowers or white stars. , Forehead wrinkles are mostly diamond-shaped, forehead wrinkles are thick and deep said lion head, the first long straight thin lines are called 10000 head or nozzle tube, ears medium and large, sagging, Jianli pig, Dongshan pig back straighter, Tongcheng pigs, two black pigs in western Yunnan and Shaziling pigs are slightly concave on their backs. They have large abdomens, less plump hindquarters, more solid limbs, multiple lying systems, fork hoofs, and 6 to 7 pairs of nipples.
1. Reproductive performance. It has been determined that there are mature spermatozoa at 45 days of age in Shaziling boars, and they are capable of breeding at 3 months of age. Generally, boars start to be bred from 5 to 6 months old and 30 to 40 kilograms in weight. Due to early mating and overuse, boars are usually used for 2 to 3 years. The first estrus of the sow is about 100 days old, and it is usually bred from 5 to 6 months of age and weighing 40 to 50 kilograms. The number of gilts produced in the first-born sows was 7-8, and the number of sows produced in the three-producing and third-producing sows was about 11.
2. Finishing performance. Under rural rearing conditions, finishing pigs can reach an 80-kg weight at 8 months of age. About 80 kg of fattening pigs, slaughter rate of 71%, carcass lean percentage of 41% to 44%.
3. Hybrid use. The use of two Chinese black pigs as maternal females and crossbreeding of imported lean ones produces better lean pigs.
2. Ningxiang pigs Ningxiang pigs (also known as grass red pigs and Liushahe pigs) are produced in Ningxiang County, Hunan Province and are one of the four major pig breeds in Hunan Province. They were recommended by the UN Food and Agriculture Organization of the United States in the 1970s. Ningxiang pig has the advantages of early maturity, long side and side fat, strong accumulation of fat, rapid growth, resistance to roughage, thin skin, tender meat, good quality of meat, and more fat.
Ningxiang pigs are medium-sized, medium-sized heads, and have wrinkles in the shape and depth of the forehead. The ears are small, drooping, the neck is short, and the flesh is lopsided, the back is wide, the backline is more concave, and the ribs are arched. Drooping, short limbs, lack of full thighs, multi lying system, spitshoof, the masses called "the monkey's foot board", the coat is black and white. According to the head type divided into three types: lion head, blessing head, 阉 chicken head.
Ningxiang pigs have a daily gain of 368 g during the finishing period, and the feed utilization rate is high. When the body weight is 75-80 kg, slaughtering is appropriate, the slaughter rate is 70%, and the lean meat percentage is 34.7%. Ningxiang pigs had more than three births and 10 calves.
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