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Optimization and purification method of small tail han sheep

A technology of small-tailed Han sheep and purification method, which is applied in the direction of animal husbandry, etc., can solve the problems of insufficient selection and purification of small-tailed Han sheep, the decline of breeding performance of the population, and the effect of hybrid utilization, and achieve the improvement of important production traits, The effect of improving genetic homozygosity and improving the value of hybridization

Inactive Publication Date: 2016-12-14
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the important reasons is that the selection and purification of the small-tailed Han sheep population is not enough, which leads to the decline of the breeding performance of the population and affects the effect of hybrid utilization

Method used

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  • Optimization and purification method of small tail han sheep
  • Optimization and purification method of small tail han sheep
  • Optimization and purification method of small tail han sheep

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for selecting and purifying small-tailed Han sheep comprises the following steps:

[0045] (1) To establish the basic breeding group of Small-tailed Han sheep: select 5 small-tailed Han sheep rams and 100 small-tailed Han sheep ewes to form the basic breeding group; the selected rams are 3-5 years old, from Individuals with three or more births, and the selected rams must meet the following conditions: when the rams are collected twice within a week at intervals of 3 days, the semen volume is not less than 1.2 ml, and the sperm motility is above 60% , the density is 2-4 billion sperm per milliliter of semen, the sperm deformity rate is ≤15%, and the size and appearance of the rams are similar, and there is no blood relationship between them; the selected ewes are 4-5 years old, More than 10 lambs were produced for 4 consecutive times, more than 9 lambs survived weaning, and there was no birth record of offspring with genetic defects; once the breeding base grou...

Embodiment 2

[0057] A method for selecting and purifying small-tailed Han sheep comprises the following steps:

[0058] (1) Establish the basic breeding group of Small-tailed Han sheep: select 4 small-tailed Han sheep rams and 88 small-tailed Han sheep ewes to form the basic breeding group; the selected rams are 3-5 years old, from Individuals with three or more births, and the selected rams must meet the following conditions: when the rams are collected twice within a week at intervals of 3 days, the semen volume is not less than 1.2 ml, and the sperm motility is above 60% , the density is 2-4 billion sperm per milliliter of semen, the sperm deformity rate is ≤15%, and the size and appearance of the rams are similar, and there is no blood relationship between them; the selected ewes are 4-5 years old, More than 10 lambs were produced for 4 consecutive times, more than 9 lambs survived weaning, and there was no birth record of offspring with genetic defects; once the breeding base group wa...

Embodiment 3

[0070] A method for selecting and purifying small-tailed Han sheep comprises the following steps:

[0071](1) To establish the basic breeding group of Small-tailed Han sheep: select 6 small-tailed Han sheep rams and 90 small-tailed Han sheep ewes to form the basic breeding group; the selected rams are 3-5 years old, from Individuals with three or more births, and the selected rams must meet the following conditions: when the rams are collected twice within a week at intervals of 3 days, the semen volume is not less than 1.2 ml, and the sperm motility is above 60% , the density is 2-4 billion sperm per milliliter of semen, the sperm deformity rate is ≤15%, and the size and appearance of the rams are similar, and there is no blood relationship between them; the selected ewes are 4-5 years old, More than 10 lambs were produced for 4 consecutive times, more than 9 lambs survived weaning, and there was no birth record of offspring with genetic defects; once the breeding base group ...

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Abstract

The invention relates to an optimization and purification method of small tail han sheep which comprises the steps that first, an appropriate number of first-grade stud rams and an appropriate number of first-grade ewes are selected to form a fundamental breeding herd, once the fundamental breeding herd is selected, breeding sheep are not introduced in all generations any more, and closed breeding is carried out; a certain number of G1 generation rams and G1 generation ewes are selected and remained from the next generation bred by the fundamental breeding herd; once the G1 generation ewes come into estrus, semen from one of G0 generation rams is randomly selected for mating, any degree of inbreeding is not limited; a certain number of small tail han sheep rams and small tail han sheep ewes are selected and remained from the G2 generation, the optimization and purification herd of the small tail han sheep is formed by the sheep obtained through the above steps and the sheep of the fundamental breeding herd. The optimization and purification method of small tail han sheep has the advantages that compared with the traditional methods, the small tail han sheep bred by the optimization and purification method have a faster genetic progress of germplasm characteristics between generations, and consistency of the population and seed performance are improved, and seed value is enhanced.

Description

technical field [0001] The invention belongs to the field of animal husbandry and breeding, in particular to a method for selecting and purifying small-tailed Han sheep. Background technique [0002] In the production of mutton sheep, "heterosis" refers to the hybridization between different mutton sheep breeds, strains or groups, and its offspring surpass the offspring of the pure breeding group of the parents in terms of vigor, growth potential and production performance. However, hybridization does not necessarily produce heterosis. The strength of heterosis is not only determined by the genetic distance between the parents, but also related to the performance and genetic homozygosity of the parents themselves. The optimal selection of the parent group is related to the purification and the selection of hybridization methods, all of which have a direct impact on the hybridization effect. Among them, the purity and impurity of the hybrid population have a huge impact on t...

Claims

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Application Information

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IPC IPC(8): A01K67/02
CPCA01K67/02
Inventor 李桢潘庆杰刘锦梅董焕声董晓
Owner QINGDAO AGRI UNIV
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