Selection method of Tibetan Mastiff breeding in Autumn

In order to promote the breeding, purification and quality improvement, only pay attention to the selection of Tibetan Mastiff is not enough, but also must pay attention to and strengthen the breeding of Tibetan Mastiff. However, it is not natural mating of Tibetan mastiff in its original place, but purposeful and meaningful selection of male and female dogs with certain characteristics in character performance, performance characteristics and genetic relationship. Matchmaking can not only consolidate the inheritance of some traits of parents, but also create and cultivate excellent Tibetan Mastiff individuals. This mating method or mating form is called Tibetan Mastiff mating. Tibetan mastiff matching has the following types.

1. Grade matching is to grade the male and female dogs according to the comprehensive rating standard, and determine the grade of the male and female dogs, and then determine the pairing or mating of the male and female dogs. Males are usually rated higher than bitches, and each generation of main male dogs should reach special grade, not lower than grade 1. Base bitches or so-called mated bitches should reach grade 1, and individual Tibetan Mastiffs with unique performance or characteristics are allowed grade 2. Male dogs are graded according to special or first class requirements, because male dogs have a large influence. The breeding of male Tibetan mastiff with excellent breed performance or characteristics is beneficial to improve the overall level of the dog group, and make the dog group's characters neat and consistent. The significance of maintaining pedigree is to maintain different dog types characterized by pedigree. According to investigation, Tibetan Mastiff has 6 basic hair colors, and each has its own characteristics in head shape, mouth shape, tail shape, hair distribution, temperament grade and so on. Selecting male and female dogs for mating according to pedigree can effectively integrate the traits and characteristics of male and female dogs of different pedigree to create ideal Tibetan mastiff individuals, and can also stabilize and maintain the excellent performance and characteristics of Tibetan mastiffs of various pedigree. On the one hand, the method of keeping seeds according to families should be used scientifically. It is stipulated that in the generation replacement, each male dog must have one son to inherit its bloodline. It is also stipulated that each female dog keeps a daughter to maintain its heredity. This allows the characteristics of each family to be preserved. On the other hand, mating between males and females within or between lineages is not excluded. In the latter case, inbreeding is permitted to a certain extent and degree. In order to expand or stably inherit the unique quality of a Tibetan Mastiff family, or to eliminate the recessive defects that may exist in a certain lineage, the most effective method is to carry out a certain degree of genetic mating in the Tibetan Mastiff family, that is, inbreeding. According to the determination, Tibetan Mastiff has a very strong ability to resist inbreeding, using inbreeding coefficient of 3 . 125 %-12 . 5% of the inbred forms, such as aunt and nephew, uncle and nephew, even half-sibling mating, can effectively reproduce the morphology and characteristics of outstanding ancestors in the offspring Tibetan Mastiff, and the offspring Tibetan Mastiff does not show decline in vitality, disease resistance, adaptability and growth and development. In fact, the Tibetan people also believe that "dogs with relatives mate, and dog babies behave well." In addition, all the breeding history of livestock and poultry in the world has been checked, and almost all of them have used inbreeding to varying degrees. Inbreeding promotes homozygosity of trait genes, consolidates trait heritability, exposes deleterious genes, and effectively forms a uniform dog population. Therefore, as long as there are clear goals and correct measures, flexible methods, strict selection, not only can prevent the possible adverse consequences of inbreeding, inbreeding does not decline, and can establish a stable character, pure Tibetan Mastiff population as soon as possible. Theoretically, it can also be explained that in the nearly thousand years of history of the Tibetan Mastiff breed formation, it has experienced strict matching on the Qinghai-Tibet Plateau, tempering in the natural environment and extremely strict selection by the Tibetan masses. In Tibetan mastiff population, it should be said that the possibility of harmful recessive gene expression is very small, where there is a bad performance of the individual will be eliminated, retained individuals, almost do not carry recessive bad genes. Thus, recessive mismatches are less likely in inbreeding, and even inbreeding rarely exhibits depression. But this kind of mating can effectively promote the homozygosity of genes determining excellent traits, fix excellent traits and preserve the pedigree of some excellent individuals, and turn the quality and performance of a very good Tibetan Mastiff into a common population as soon as possible, thus realizing the goal of creating and breeding excellent Tibetan Mastiff.