Sheep selection method

First, the significance and role of matching The so-called matching is based on the selection of species, according to the characteristics of the ewes, for their selection of the right ram to breed, in order to obtain the ideal offspring. Therefore, the selection is the continuation of the selection work. In the large-scale breeding of sheep and goats, they are two important and inseparable links. It is the most fundamental method for improving and improving the quality of the sheep. The role of matching is to consolidate the selection effect. Through proper matching, the inherently superior traits of the parents are passed on to the next generation stably; the different fine traits dispersed on the parents are passed on to the next generation; and the subtle, less obvious, good traits are accumulated and passed on to the next generation. Generation; Weakened or eliminated poor traits and defective traits. Second, the types of matching options can be divided into two types of phenotype matching and kin selection. The phenotype matching is based on the phenotypic characteristics of the male and female ewes themselves, and the kin selection is based on the kinship of the two parties. Both types of matching can be divided into homogenous and heterogenous matching. Among them, the homogeneity and heterogenous matching of kin selection means inbreeding and outbreeding. The phenotype matching is quality matching, and it can be divided into homogenous matching and heterogeneous matching. 1, homogenous matching. It refers to mating between males and females with the same good traits and characteristics, so that the same characteristics can be consolidated and continued to improve in the offspring. Generally, the special-grade sheep and the first-class sheep belong to the ideal type of sheep, and the mating between them is of the same nature; or when excellent rams appear in the sheep, the excellent quality and outstanding characteristics of the sheep can be in the offspring. In order to save and develop, the ewes with the same quality and advantages in the same group can be used to mate with each other. This is also a homogeneous selection. For example, large, long-haired ewes are paired with large, long-haired rams so that their offspring can be inherited and developed in terms of size and length. This is the matching principle of "with excellent distribution". 2, heterogeneous selection. Refers to the selection of male and female rams that differ in their main traits for mating. The purpose is to combine the different good traits of the male and female rams in the offspring to create a new type; or to correct it with the advantages of rams. Or overcome the shortcomings or deficiencies of the ewes. The use of special, first-grade rams with hens of less than two grades is heterogeneously matched. For example, selecting a large body, a long hair, a dense hair, a first-grade ram and a small, short-haired, hairy secondary ewes to increase the size of their offspring and increase wool, while the wool density continues to be consolidated. improve. Another example is the use of rams, which are fast-growing, meaty, and highly meat-producing rams, matched with indigenous Mongolian soil ewes with strong local adaptability, small physique, and poor meat performance. Their offspring are in physique. Size, growth and development speed and meat performance significantly exceed the female parent. In heterogenous matching, the most important beneficial qualities of ewes must be supplemented and strengthened by the advantages of rams, so that their defects and deficiencies can be corrected and overcome. This is the matching principle of "public good than mother." Third, the selection should follow the principle of 1, the ram is better than the ewes when the ram selection ram, in the overall quality and grade must be better than the ewes. 2. When choosing the ram for the ewes that have certain disadvantages and deficiencies in the use of male rams, they must choose rams that have outstanding advantages in this aspect to be bred with male rams. Never use rams that have the opposite disadvantages. Sheep are mated. 3, should not be abused when using kinship matching should be particularly cautious, avoid abuse. 4, timely summaries of matching effects If the effect is good, according to the original program again to match. Otherwise, the original matching scheme should be amended and another ram be selected for matching.

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