Seed selection and matching are two inseparable aspects of black guinea pig breeding. Selection is the continuation of seed selection and is one of the important means of breeding. In the production of dolphins, good breeding dolphins do not necessarily produce good offspring. Because the pros and cons of the offspring are determined not only by the quality of their parents themselves, but also by the suitability of their pairing. Therefore, in order to obtain the ideal offspring, in addition to the selection work, the selection work must also be done well. Matching can be divided into phenotype matching, kinship matching and age matching.

First, phenotype selection

Table Type matching, also known as quality matching, is a method of selecting and matching male and female dolphins according to their shape, traits or quality. It can be divided into two types: same-type matching and special-type matching.

(1) Isotype matching

Isotype matching is to select male and female dolphins with the same traits and performance in order to obtain similar excellence offspring. The more similar the matching two parties are, the more likely it is to pass on the common excellent quality to the offspring, and it is also possible to transform the individual quality into the quality of the group, so that the number of excellent individuals will increase. For example, in order to improve the growth rate of the dolphin group, the male and female dolphins with fast growth rate can be selected to mate, so that their offspring can maintain this excellent characteristic. Therefore, this matching method is suitable for use between excellent male and female dolphins, or when there is already an ideal breed of dolphins in the dolphin group.

(II) Irregular matching

Irregular matching can be divided into two situations, one is to select male and female dolphins with different excellent traits Mating with the hope of combining the two traits to obtain offspring with the different advantages of both parents. For example, the male and female dolphins with fast growth rate and larger size of black dolphins are selected to mate, so as to make the offspring grow faster and larger, and ultimately improve the quality of the offspring.

Another situation is to select male and female dolphins with different degrees of pros and cons of the same trait to mate. For example, in this breed, some breeds of dolphins have better reproductive performance, but the growth rate is slow. You can choose a male dolphin with a fast growth rate to match it, so that the offspring will not only improve the fertility but also grow faster. Also faster. Practice has proved that this is an effective matching method that can be used to improve many traits.

2. Age matching

Age matching is a method of matching according to the age between male and female dolphins. The age of the black dolphin significantly affects its reproductive performance. Generally speaking, the reproductive performance of young dolphins is poor, and the reproductive performance gradually improves with age. The reproductive performance gradually reaches a peak from 0.9 years old to 2 years old, and gradually declines after 2.5 years old. Under the conditions of feeding and management in my country, breeding dolphins are generally used at 1 to 2 years old. Therefore, in the practice of raising dolphins, it is usually advocated that the mature male dolphins are matched with the mature female dolphins, and this matching method is effective.

III. Kinship matching

Kinship matching is a matching method that considers whether there is a blood relationship between males and females. The mating male and female have kinship (in animal husbandry, there is blood relationship within 7 generations), it is called inbreeding, and those without blood relationship are called non-inbreeding. Inbreeding of black dolphins often brings adverse effects, such as decreased fertility and reduced viability of offspring. But it is also believed that inbreeding can improve the fecundity of black dolphins. In the breeding process, the application of inbreeding is conducive to fixing the excellent traits of breeding dolphins and rapidly expanding the number of excellent breeding dolphins. It can be seen that inbreeding has both advantages and disadvantages. In production practice, the inbreeding method should not be used in commercial dolphin farms and breeding farms, especially for professional breeding households. Even if it is used in black breeding, the selection should be strengthened, and the bad individuals caused by inbreeding should be eliminated in time to prevent the decline of inbreeding.