Choosing good rabbit breed rabbits should mainly be done in four aspects: (1) Examine the genealogy and look closely at the characteristics. Good breed rabbits should have complete pedigree file information. The pedigree should record the ear numbers, origin, date of birth, coat color characteristics, body weight, growth and reproductive performance of 3 to 5 generations. The selected rabbits should be descendants of excellent ancestors and have obvious characteristics of this breed. The male rabbits come from different pedigrees and are weighed between 1.25 and 2.5 kilograms for 2 to 4 months of age. 2 Before the investigation of the seven chants, the second view of the two holes. Healthy rabbits have bright eyes, ruddy eyes and clean eyes. Nostrils are clean, normal breathing, no nasal fluids, no sneezing. Oral mucous membrane normal color, no ulcers and blemish, no tooth. The ears are upright, flexible, and there are no phlegm and dirt on the inside of the ear. The anus is clean and there is no thin fecal adhesion. The vulva is clean, no edema, ulcers, knots, and purulent secretions. 3 Look closely at the abdomen and move far away. Looking at the abdomen, the number of female nipples should be more than 8 and less than 8 should not be planted. Male rabbit testis is well-balanced and flexible. The scrotum is clean, ruddy, without edema and ulcers, and should be prevented from becoming a single green or cryptorchid of rabbits. Stand 2 to 3 meters away from the rabbit to see the posture and movement of the rabbit. Raise the rabbit and let go 30 cm from the ground. Can not choose "O"-shaped legs, "8"-shaped legs and waist fold, hind-limb rabbits. 4 touch a line, check down four points. A line that is the spine should be straight, no protrusions and depressions. The spine is not very exposed, and the posterior view of the spine is curved and the hindquarters are plump and well-developed. If the spine is an abacus bead, the appearance is triangular and it is a thin rabbit, which may be malnutrition or parasitic disease. Limbs should be dense hair, bright skin, no sputum and abscess. Young rabbit claws should be hidden in the hairs of the feet, short and straight, and the red lines of the claws are long. Adjust the rabbit population. Frail male and female rabbits should not be planted, should be eliminated, and promptly added, replaced by young male and female rabbits. To choose healthy, stable development, strong sexual desire, strong mating ability, body appearance meet the requirements of species, hereditary stable, strong disease resistance of male rabbits. Female rabbits require good genital development, more than 4 pairs of nipples, normal estrus, high litter size, and high lactation levels. Generally 1 male rabbit can be equipped with 8 to 10 female rabbits, with 1:3~5 being the best. 5. Pay attention to overall coordination. In previous years, the main breed of rabbits in China was the American Department. Therefore, the small body weight is a common problem. Therefore, some breeders put the main direction of breeding on the weight, breed rabbits into large rabbits of 4.5~5 kg and use it as the capital for propaganda. As everyone knows, Rex rabbits belong to medium-sized rabbits, and special breeding can make them grow to more than 5 kilograms. However, after the weight exceeds a certain range, its overall coordination sharply declines. Especially reproductive performance, disease resistance (such as foot dermatitis) and life span. 6. Both heavy growth speed and heavy coat quality. In some places, the purchase of commercial rex rabbits is measured in terms of body weight, ranging from 15 to 20 yuan per kilogram of live weight. The body weight of 2.5 kilograms can reach the minimum standard for acquisition. As for the coat density, whether it is in the hair-changing period, how mature the skin plate is, how old the moon is, regardless of whether or not. Under the guidance of this behavior, many people only pay attention to the speed of growth and development. Everyone who chooses to grow fast will choose to stay. In this way, after several generations of breeding, the growth rate has gone up, and the quality of the coat has dropped. Over time, Rex Rabbit became a rabbit. 7. Can not pursue one-sided long hair while ignoring comprehensive traits. Many people in the breeding work will be the length of the coat as an important indicator of selection, as long as the hair, regardless of other properties, all stay elected. This one-sided pursuit of long hair and ignoring the practice of comprehensive traits undoubtedly brings disadvantages to the development of rabbits. 8. The coat's density, length, and uniformity are the three major measures of coat quality. But which part is the measurement standard? The performance of the three indicators of different parts of the rex rabbit body surface is different. In terms of coat density, the hips are the highest, the abdomen and the thigh are the lowest, and the back has a strong representation. Therefore, many people choose only to see the middle of the back. In this way, it is easy to ignore those weak links, and those rex rabbits that have significant defects in those key parts ("needles" on the neck, inner thighs, and bottom of the feet) are selected as species. 9. Pay attention to phenotypic traits, but you cannot ignore the genetic basis. Due to the different number of pheasants born, the amount of lactation is different, and the feeding conditions are very different, so there are certain differences among rabbits, families, individuals, and between litters. Some of these differences are due to genetics and partly due to environmental effects. Phenotype = genotype + environment, which is the basic principle of animal genetic breeding. The purpose of our selection is to select those phenotypic differences that are really due to genetic factors, and to remove those differences due to different environments. For example, a female gave birth to eight females and another female gave birth to one. In general, the mother rabbit that produced only 8 rabbits had no more milk, and her average rabbit's milk could not exceed that of the "only child." Therefore, the "only child" grows at a much higher rate than many other siblings. If you select only the individual phenotypes, it is likely that the best individuals will be excluded from the selected range. 10. Combination of adult selection and stage selection. Some people buy rabbits or choose to breed rabbits. They do not examine the whole process of breeding rabbits, including the condition of the rabbit's ancestry (that is, parents and grandparents or grandparents, etc.), compatriot performance, individuals from birth, weaning, young, youth The performance of each stage of adulthood, often just observing the weight, coat and other external traits of the adult stage, brings certain blindness to the selection.
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