Breeding method of new disease-resistance large white pig strain

Abstract

The invention discloses a breeding method of a new disease-resistance large white pig strain. The method includes the following steps that 1, a feed adding method is adopted to conduct an Escherichia coli infection experiment on weaned piglets of a core group in large white pigs, and an Escherichia coli resistant breeding basic group in the large white pigs is established; 2, concentration determination is conducted on cytokines of interleukin 1beta, interleukin 4, interleukin 6, interleukin 8, interleukin 10, transforming growth factor beta, tumor necrosis factor alpha and interferon gamma of an Escherichia coli resistant population in the basic group; reproductive performances are detected and selected, growth speeds, lean meat ratios and carcass quality characters, and a first generation is established; 3, a group subculture selective breeding method and a molecular-marker-assisted selection method are adopted. In this way, by the adoption of the breeding method of the new disease-resistance large white pig strain, after four to five generations, a vested breeding target is achieved gradually, a new-strain core group is established, and the morbidity of piglet diarrheal diseases is expected to be reduced.

Description

technical field [0001] The invention relates to the fields of animal genetics, breeding, reproduction and molecular biology, in particular to a method for cultivating a new disease-resistant strain of Large White pigs. Background technique [0002] my country's pig industry has a strong pig production system, which is often said that "my country is a big country for pig farming", but the top core breeding pig resources in the "pyramid" breeding system have long relied on imports. For a long period of time, my country has been in a vicious circle of "introduction → maintenance → degradation → re-introduction" for breeding pigs. After joining the WTO, this situation has become more serious. In short, the obvious dependence on the introduction of breeding pigs is very unfavorable to the sustainable development of my country's pig industry. Considering the long-term interests of the country, this phenomenon should not continue to develop. Faced with this situation, we must chan...

AI Technical Summary

Problems solved by technology

Large white pigs play an extremely important role in the production of "three-way" hybrid commercial pigs in my country. The excellent characteristics of imported large white pigs are mainly high growth performance, but there are also problems and deficiencies such as disease resistance and reduced fecundity, especially in recent years. The incidence of diseases such as diarrheal disease in incoming piglets is high, which directly and indirectly leads to a decrease in the conception rate of sows, the number of piglets born alive and the survival rate of weaned piglets

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