Breeding method of high-yield and disease-resistant new line of Meishan pig

Abstract

The invention relates to a method for cultivating high-yield disease-resistant new-strain Meishan pigs. The method is characterized by including: infecting a Meishan pig core group with F18 escherichia coli, and forming a Meishan pig F18 escherichia coli resistance breeding underlying group according to results of phenotype identification; measuring the concentration of F18 escherichia coli resistance group cell factors (IL-2, IL-6, IL-10, IL-12, IFN-alpha and IFN-gamma) in the underlying group; performing comprehensive index breeding on common disease resistance according to individual comprehensive scores by building a main component comprehensive evaluation model, and detecting and selecting characters such as reproductive performance at the same time to obtain a first generation; using continuous progeny selection and molecular marker-assisted selection to gradually achieve the breeding target of cultivating the new strain core group after 4-5 generations. The new-strain pigs are resistant to post-weaning diarrhea, edema diseases and stress, high in environment adaptability, good in meat quality, high in feed conversion and large in litter size.

Description

technical field [0001] The invention relates to a method for cultivating a new high-yield and disease-resistant strain of Meishan pig, and belongs to the technical fields of animal genetics, breeding and reproduction, and molecular biology. 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 s...

AI Technical Summary

Problems solved by technology

The excellent characteristics of Meishan pigs are mainly high reproductive performance and excellent meat quality, but there are also problems and deficiencies such as low lean meat rate and decreased disease resistance, especially in recent years, the incidence of diseases such as diarrhea, edema and asthma in piglets is relatively high. High, directly and indirectly lead to a decline in the conception rate of sows, the number of live piglets and the survival rate of weaned piglets, so that the recognized high fecundity of Meishan pigs cannot be fully utilized

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