There are many ways of economical hybridization for pigs, each with its own advantages and disadvantages. Here are three ways commonly used in economic hybrids. 1. Hybrids of two varieties Hybrids of two varieties are also called binary hybrids, and the hybrids obtained are binary hybrids. The method is to use two breeds each to participate in the hybrid generation, and the produced second breed hybrids are all used as commercial hogs. A variety of oysters containing male (female) B varieties (female), F1 hybrid pig (5% A, 50% B). The method of hybridization is simple. The ancestry of the hybrid generation is 50% for the father and the mother. The hybrid heterosis rate of the two varieties can reach up to 20%, and the proportion of offspring with heterosis can reach 100%. The hybrids of two varieties are hybridized by two pure breeds. Their heredity is relatively stable, the hybridization effect is reliable, the hybridization method is simple and easy, the cost is low, and they are easy to popularize. 2. Breeding of two varieties After two rounds of crossbreeding, the two breeds are selected to cross one another and select elite crossbred sows to backcross each generation with the original parental variety. This continues to be repeated in order to maintain the superiority of the hybrids. All hybrid boars and unqualified Hybrid sows are fattened as commercial hogs. ♂ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ ♀ Mixed 4 (A 31.25%, 68.75%). After two rounds of crossbreeding, the pedigrees of the two cultivars contained in the offspring basically tended to balance each other, each occupying 1/3 or 2/3 of each generation. The two breeds of crossbreeding only need to keep two boars of the parent species, but in order to prevent relatives from mating, the boars must be replaced in each generation, resulting in a certain amount of waste. The basic sow population is the hybrid sows selected for each generation and can fully exploit the heterosis of reproductive performance of the hybrid sows, but the herds are genetically unstable and highly malleable, reducing the viability and production of hybrids. performance. In the process of cross-breeding, the genetic proportion of backcrossed parents is increased in the offspring. If it is a high-yield species, the return conditions require higher feeding conditions, otherwise the heterosis will not be apparent. If the parent is a low-yielding species, the production performance of the backcross offspring will be affected by heritability. 3. Hybridization of three varieties Hybridization of three varieties is also called three-way hybridization. The method is to first use the two varieties to obtain hybrids of the second generation of the first generation, select elite sows to be females in the first generation of hybrids, and then mate with the third breed of boars; the resulting offspring are all used as commercial hogs. ♂ ♀ ♀ 〠ã€, ♂ æ‚ â™€ ♀ ♀ ♀ ♀ ♀ ♀ (A 50%, 5 50%), Miscellaneous 2 (A 25%, 2 25%, C 50%) (commercial pig). The effect of crossbreeding between the three varieties is not stable The reason is to make use of the binary hybrids of the first-generation hybrids and then to cross them with the third variety to finally obtain three-way hybrids of commercial pigs. Because of the hereditary instability of the first-generation hybrids, having a strong plasticity susceptible to changes in the external conditions, and hybrid heterosis with the third varieties when the heterosis is not stable. The separation of the three-way hybrids will have poor consistency, but the three-way hybrids can fully utilize the heterosis of reproductive performance of the first-line hybrids of the two varieties. Since the reproductive performance is mainly determined by the female parent, the binary hybrids are mainly used as female parents in the three-way hybridization. Soft Bandages,Cotton Bandages,Medical Bandages,First-Aid Plaste Bandage Zhende Medical Co.,Ltd , https://www.zdmedicalproduct.com
Pig hybridization method