One- and two-way crossbreeding: The male sheep breeds with good production performance are used as male parents, and the local goats are used as female parents, and the hybrid generation is used for fattening sheep for production. For example, the use of Charolais to improve small-tailed Han sheep is a binary cross. Second, three-way crossbreeding: the local sheep as a parent (such as the small tail Han sheep), select sheep with good meat performance, as the first male parent, the use of its precocious, large body size, high reproductive rate, production and other characteristics; Mating with small-tail sheep ewes, F1 female parent with large body size, high reproductive rate and good lactating performance is used as the mother of lamb production and F1 ram is used directly. Then choose a lamb with a large birth, a fast-growing, large-bodied, lean-flesh meat species (such as Charolais or Suffolk) as the terminal father (the second male parent, and the first male ram as the first The two male parents mate with F1 hybrid ewes, and F2 is used as fat lamb production. As a result, the lambing rate is high, and the lamb inherits the characteristics of large parent body, robustness, and good meat performance (fast growth and production of meat). Third, advanced hybridization: To change the direction of the production of a variety, to replace the characteristics of the original varieties to improve the characteristics of most varieties, the application of progressive hybridization is a more effective method. Progressive hybridization is the hybridization of two cultivars. The hybrid ewes produced from the first generation hybrid and subsequent generations are continued to be mated to the 3-5 generations with the same improved ram, so that the performance and characteristics of the hybrid offspring are basically similar to those of the improved cultivars. . As for how many generations of hybrids should be advanced and how much the blood content of the improved varieties should be, it depends on the local ecological conditions and breeding objectives. When the hybrids basically reach the breeding goal, the hybridization can be stopped and the group breeding will be changed. The population formed by advanced hybridization can have two kinds of fate: one is to belong to the original improved variety, and the other is to breed a new variety. China Agricultural Network Editor
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