Family selection method
Family selection mainly includes siblings, half-sibs, descendants determination and genealogy identification. Rabbit breeding work is widely used in the determination of siblings and half-sibs. Because the number of years that rabbits can use is very short, it is necessary to wait for a long time to determine the descendants after giving birth. The use of siblings and half-sibs to determine the results can be achieved in a short period of time to accelerate the breeding work. Siblings and half-sibs are commonly used to measure traits with low heritability, such as fertility, milk-secreting ability, and survival rate. When measuring, siblings and half-sib numbers are required for those with low heritability.
1. Determination of descendants: The identification of offspring quality can be used to identify the breeding value of male and female breeders. To identify the body weight gain, health status, meat production performance, and hair production performance of 1 month and 4 months old rabbits produced by male and female rabbits.
2, pedigree identification: pedigree identification for young rabbits to choose.
Individual selection method
According to the rabbit's own performance, that is, physical characteristics and production performance to choose. This method is very simple, especially suitable for high heritability options, because the high heritability of the traits, in rabbits, the differences between individuals. The use of individual choice should have different requirements for rabbits of different uses. In addition to fertility, meat rabbits were primarily assessed for size. The slaughter rate was 53%, and the ratio of feed remuneration to feed-to-flesh ratio 3.5 was the best. Rabbit skin, mainly to see how the quality of the skin, body size, requires a good bust, hip. Rabbit hair mainly depends on the amount of wool produced and the quality of rabbit hair. In combination with rabbits, it is mainly to look at meat and skin with the special shape of both, that is, to evaluate the size of the body, the growth rate, the quality of the rabbit meat, the meat production performance, and also the quality of the fur. From this point of view, individual selection is the choice of the physical characteristics and production performance of a rabbit.
Comprehensive identification
The comprehensive appraisal method integrates the individual qualities of the rabbits, the pedigree selection, and the selection of descendants. You can choose in stages:
1. Choose a rabbit, it must be selected from the rabbits produced by the female rabbit.
2. Choose from the descendants of the fifth nest. Should be based on the identification of the lineage, combined with the uniformity of the growth and development of fellow siblings. It is usually done when the rabbit leaves lactation.
3. For meat rabbits, carry out at 3 months of age. For hairy rabbits, they are carried out at the time of cutting the first hair, and the 50-day to 65-day-old focuses on the weight of the hair when sheared.
4, at the age of 5 months, for meat rabbits, check the growth and development again, and check the growth and development of the wool exemption, focus on checking the weight and the amount of hair shearing during the second shearing.
5, 6 months to 7 months of age in reference reproduction performance, when the growth and development of rabbits mature, medium-sized breeds have participated in breeding, mainly to see their fertility rate, mating ability, birth rate and survival rate of rabbits. For hairy rabbits, the third shearing amount can also be used as the rabbit's annual hair yield to make predictions.
Observation screening
When selecting rabbits, they must be meticulous and patient. Observe the external appearance of the rabbit, such as physique, body shape, eye color, coat color, whether there is meat, ear shape, feeding characteristics, walking characteristics, etc. Those who do not meet the criteria of appearance characteristics must not be selected for breeding. There are various types of malformations or physiological defects, whether they are congenital or acquired, they cannot be selected for breeding.
1. Lop-ear: Lop-ear refers to the fact that rabbit ears are sagging, which is an inherent characteristic of certain breeds, such as British lop-eared rabbits, French lop-eared rabbits, and Dutch lop-eared rabbits. However, for most species, both ears of rabbits should be upright. Due to genetic or acquired causes, one or two of the ears have fallen, which is a physiological defect and should not be used as a seed. If it is caused by the day after tomorrow, for example, if you only catch two ears when you catch a rabbit, you will not choose to use it because the weight is too high and the ear cartilage is damaged.
2, the incisor is too long: too long incisors are also called mandibular condyle malformation. Some rabbits have long teeth protruding from the lower incisors, resembling long, tusks-like teeth, but the upper incisors are long in their mouths and become long and curved, just like sheep's horns, which seriously affect rabbit feeding. In particular, it is more difficult to eat long grass, and it is easy to puncture the upper jaw and gums, causing inflammation, which seriously affects the growth and development of rabbits.
3, cocoon: Cocoon refers to the rabbit's buttocks. Some rabbits' hips are too oblique. Although such rabbits do not necessarily exhibit poor meat performance, they are inconvenient to mate, and their appearance is not beautiful, and they are not suitable for use as a seed.
4, eight-character legs: eight-leg legs also known as water skiing legs. The two legs stretched out diagonally in front of each other in a figure eight, causing the rabbit to walk hard. The eight-character leg is congenital and gradually formed. Congenital can be inherited. Acquired is due to nutritional imbalance, inappropriate calcium and phosphorus ratios; improper management, such as childhood living on the bottom of the net is too smooth, the body center of gravity changes, causing leg bone deformities caused. Regardless of whether it is congenital or acquired, it must be removed. It cannot be used for breeding.
5, reproductive disorders: single testis, cryptorchidism or small testicular malformations, male and female is difficult to distinguish, too little symptoms of nipples suffering from rabbits, should not be selected as a species.
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