Appearance characteristics of two-headed black pigs in central China
The trunk and limbs of two black pigs in Central China are white, and the head, neck, buttocks and tail are black. There is a halo of 2 ~ 3 cm wide at the junction of black and white, and a handful of white hairs on the forehead are called pen bud flowers or white stars. The head is short and wide, and the wrinkles on the forehead are mostly diamond-shaped. Those with thick and deep wrinkles on the forehead are called lion heads, while those with long straight forehead lines are called swastikas or oil nozzles. The ears are medium-sized and drooping. Jianli pigs and Dongshan pigs.
The coat color is "nod and ink tail" or "black at both ends", that is, the head and buttocks are black and the other parts are white; The hip black spot is round or oval around the tail root. The coat color of the tail tip can be divided into black and white, of which the white tail accounts for 48.9%. Shaziling pig's head is short and wide, with a straight mouth, a slightly concave face, medium-sized ears, a butterfly shape, wrinkled forehead, a straight back and waist, and strong limbs. The nipple is well developed, with more than 7 pairs of effective nipples.
Production performance of two-head black pigs in central China
growing development
Due to the wide distribution of producing areas and different feeding conditions, there are certain differences among groups. The Liangtouwu and Tongcheng pigs in western Jiangxi are smaller, while Dongshan and Jianli pigs are larger. 6-month-old weight, boar 36 kg, sow 38 kg. It grows and develops rapidly before 6 months old and reaches adulthood at 2 years old. Adult sows of different groups weigh 94 ~124 kg, grow 20 ~129 cm, and have a bust10/~19 cm.
reproductive performance
According to the determination, Shaziling boar has mature sperm at 45 days old and has the ability to breed at 3 months old. Boars generally start breeding at the age of 5 ~ 6 months and weigh 30 ~ 40 kg. Due to early breeding and overuse, they are generally used for 2 ~ 3 years. The first estrus of gilts is about 100 days old, and they usually breed at the age of 5 ~ 6 months with a weight of 40 ~ 50 kg. The litter size of primiparous sows is 7-8, and the litter size of sows with tertiary or above is about 1 1 head. [ 1]
Fattening performance
Under the condition of rural feeding, the weight of finishing pigs can reach about 80 kg at the age of 8 months. For fattening pigs weighing about 80 kg, the slaughter rate is 7 1%, and the carcass lean rate is 41%~ 44%.