At present, the development trend of the sheep industry in the world is a shift from wool to meat, from free grazing to intensive rearing, and from the conversion of adult mutton to lamb meat production, which basically achieves industrialization and breeding of lamb meat. The standardization and standardization of product standardization have led to the realization of efficient sheep production with fast turnover, high product rate, low cost, and good economic benefits. In production, the use of binary or three-way hybrid methods for sheep production. One- and two-way hybrids use male sheep breeds with good production performance as the parent, and local sheep as female parents. The hybrid generation uses fattening for sheep production. For example, the use of Charolais to improve small-tailed Han sheep is a binary cross. The two-way, three-way hybrids use local goats as female parent (such as Xiaohai Han sheep), and select sheep with good meat performance (such as Dorset) as the first male parent to use its early maturation, large size, and reproductive rate. High, fast production and other characteristics, mating with small-tail sheep ewes, production F1 female parent size, high reproductive rate and good milk performance, as the mother of lamb production, F1 rams are directly meat. 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, progressive hybridization to change the direction of the production of a variety, to improve the characteristics of the varieties replace the characteristics of the original species, 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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