Abstract:Congling Tibetan Chicken grows in the Congling area of the Gannan Plateau at an altitude of 1200-2900 m, which is extremely cold, low-pressure, and anoxic. Congling Tibetan chicken is a local original breed, and has not been systematically selected for a long time. In order to grasp the relationship between the physical properties of Congling Tibetan chicken eggs and hatching rate, to find out the influence on hatching rate and healthy chick rate, this research establishes a relatively sound and perfect Congling Tibetan chicken breeding technology. This is expected to improve the reproductive capacity of Congling Tibetan chickens and solve the problem of low fecundity. In this experiment, 25,000 freerange Congling Tibetan chickens were selected from Zhouqu Dongsheng Breeding Professional Cooperative, and 6,000 eggs were collected within 10 days for incubation. We carried out the relationship between eggshell color, thickness, egg shape, egg weight and other physical properties of Congling Tibetan chicken breeder eggs and the hatching rate and healthy chick rate of Congling Tibetan chickens. The results showed that there was a significant negative correlation between eggshell color and egg shape index (R = -0.062, P< 0.01), and there was a significant weak correlation between eggshell color and eggshell thickness and egg weight (R = 0.123, R = -0.321, P< 0.05). There was an extremely significant negative correlation between eggshell thickness and egg shape index (R = 0.234, P< 0.01), and a significant negative correlation with egg weight (R = 0.062, P< 0.05). There was a significant positive correlation between egg shape index and egg weight (R = 0.205, P< 0.01). When breeding, eggs with pinkish-brown eggshell, eggshell thickness between 0.26 and 0.31 mm, egg shape index ≧ 0.80 (round), and egg weight ≦ 35 g should be selected as breeding eggs, so as to improve hatchability and healthy chicks Rate.
