The evaluation of the pig appearance is a phenotypic selection method that directly selects the seed according to the body appearance and shape structure. The pig shape can reflect the pig's physique, function, production performance and health status, especially for the varieties of features and limbs robustness of the project must be selected according to the appearance of the assessment, so modern breeding of breeding pigs still need to emphasize the appearance of assessment, but the appearance can not be assessed Really reflect the genetic quality, can only be used as an auxiliary method, requiring the selection of personnel have a wealth of experience. Appraisal of appearance was performed on four aspects: breed characteristics, body, reproductive organs, and personality, and then multiplied by a certain economic weighting factor. Finally, a comprehensive score was obtained to evaluate the appearance and quality of breeder pigs. Technical points: (1) Variety characteristics (30 points) The overall perception: high and long open, strong and well-balanced, strong vitality, obvious characteristics of the species to give 5 points; short thick, thin bones, heterozygosity to give 0 points. The coefficient is 3. Head features: appropriate proportions, ear, forehead, face, mouthpieces in line with the characteristics of the species to give 5 points; eye stains, rolling ears, pocket teeth to give 0 points. The coefficient is 2. Coat: 5 points for short and smooth; 0 points for noise, stain, and backspin. The coefficient is 1. (2) Body (35 points) Front and rear torso: Muscular fullness, 5 points for obvious body widening, 0 points for varicose veins, sharp edges and corners, and a burden. The coefficient is 3. Thoracolumbar: The chest is deep, the back is wide and flat, combined with fluency, the abdomen and blepharospasm give 5 points; the thoracic vertebra muscle atrophy, tie ribs to 0 points. The coefficient is 2. Limbs: standing, steady and powerful gait, flexible joints, sturdy skeletal, shoulder-to-shoulder height of 5 points; 0 points for lying, hooves, large ball joints, O-legs. The coefficient is 2. (3) Reproductive organs (30 points) Effective nipples: 7 pairs of white pigs, 6 or more pairs of Duroc, symmetrically arranged, well-developed to give 5 points; vice milk, nipple flat to give 0 points. The boar coefficient is 2, and the sow coefficient is 5. Testicular development: full development, well-proportioned, epididymis obvious, scrotal relaxation, moderate distance from the anus to give 5 points; single testosterone, cryptorchidism, and partial testosterone give 0 points. The coefficient is 2 (boars only). Urine: 5 points without urine; 0 points with urine and soft whip. The coefficient is 2 (boars only). Puss development: 5 points for normal; 0 points for small but upturned. The coefficient is 2 (sow only). (4) Character (5 points) Affinity: 5 points for lively, agile, and stable; 0 points for wood and fur. The coefficient is 1.
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