畜牧兽医学报 ›› 2024, Vol. 55 ›› Issue (12): 5464-5477.doi: 10.11843/j.issn.0366-6964.2024.12.013

• 遗传育种 • 上一篇    下一篇

基于50K SNP芯片评估广东省四类地方猪保种群体的遗传结构

程昕琰1(), 王诗媛1, 吉叶标1, 黄思秀1, 杨杰1, 孟繁明2,3, 张茂4, 蔡更元1, 刘琅青1,*()   

  1. 1. 华南农业大学动物科学学院, 国家生猪种业工程技术研究中心, 广州 510642
    2. 广东省农业科学院动物科学研究所, 猪禽种业全国重点实验室, 广东省畜禽育种与营养研究重点实验室, 广州 510640
    3. 清远龙发种猪有限公司, 广东省生猪育种工程技术研究中心, 英德 513057
    4. 韶关学院生物与农业学院, 韶关 512000
  • 收稿日期:2024-06-11 出版日期:2024-12-23 发布日期:2024-12-27
  • 通讯作者: 刘琅青 E-mail:cheng.xinyan@foxmail.com;langqing.liu@scau.edu.cn
  • 作者简介:程昕琰(1999-), 女, 新疆乌鲁木齐人, 硕士生, 主要从事猪遗传育种与繁殖研究, E-mail: cheng.xinyan@foxmail.com
  • 基金资助:
    广东省乡村振兴战略专项资金种业振兴项目(2022-XJS-00-002);广东省普通高校重点领域专项(2021ZDZX4040);清远市创新创业研究团队项目(2018002)

Evaluation of the Genetic Structure of Conservation Populations of Four Major Local Pig Breeds in Guangdong Province Based on a 50K SNP Chip

CHENG Xinyan1(), WANG Shiyuan1, JI Yebiao1, HUANG Sixiu1, YANG Jie1, MENG Fanming2,3, ZHANG Mao4, CAI Gengyuan1, LIU Langqing1,*()   

  1. 1. National Engineering Research Center for Swine Breeding Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, China
    2. Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition, State Key Laboratory of Livestock and Poultry Breeding, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
    3. Guangdong Engineering Technology Research Center of Pig Breeding, Qingyuan Longfa Pig Breeding Co., Ltd., Yingde 513057, China
    4. College of Biology and Agriculture, Shaoguan University, Shaoguan 512000, China
  • Received:2024-06-11 Online:2024-12-23 Published:2024-12-27
  • Contact: LIU Langqing E-mail:cheng.xinyan@foxmail.com;langqing.liu@scau.edu.cn

摘要:

旨在揭示广东省4类重点保护地方猪种的保种情况,评估其保种群体的遗传结构信息,辅助保护和利用地方猪种质资源。本研究采用2023年采集自6个保种场的广东省4类地方猪共488头(新丰板岭大花白猪92头、新丰板岭蓝塘猪34头、紫金东瑞蓝塘猪68头、乐家庄小耳花猪77头、壹号食品小耳花猪109头、北礤粤东黑猪108头)。使用50K SNP芯片对比了包括欧洲野猪、瘦肉型猪、其他华南地方猪以及其他中国地方猪在内的41个地方猪品种,共2 144头。质控后保留20 590个SNPs位点。对广东4类地方猪种保种群体进行遗传多样性、血缘纯度、亲缘关系以及家系结构分析。结果显示:新丰板岭大花白猪的近交系数(F值)为0.409,观测杂合度(Ho)为0.181,期望杂合度(He)为0.172,连续纯和片段(ROH)长度为475.81 Mb,连锁不平衡(LD)长度为467.88 kb,平均FROH值为0.212,保种场内分为5个家系;新丰板岭蓝塘猪的F值为0.316,Ho为0.210,He为0.189,ROH长度为441.76 Mb,LD长度为475.78 kb,FROH值为0.201,分为4个家系;紫金东瑞蓝塘猪的F值为0.239,Ho为0.233,He为0.218,ROH长度为224.13 Mb,LD长度为463.53 kb,FROH值为0.100,分为5个家系;乐家庄小耳花猪的F值为0.319,Ho为0.208,He为0.221,ROH长度为262.62 Mb,LD长度为460.88 kb,FROH值为0.117,分为7个家系;壹号小耳花猪的F值为0.435,Ho为0.173,He为0.171,ROH长度为113.41 Mb,LD长度为418.59 kb,FROH值为0.051,分为6个家系;北礤粤东黑猪的F值为-0.028,Ho为0.314,He为0.300,ROH长度为247.47 Mb,LD长度为467.88 kb,FROH值为0.110,分为5个家系。对各保种群体血缘组成进行分析,除粤东黑猪群体血缘仍大量受瘦肉型猪血缘影响,平均中国猪血缘比例为69.37%,其他4个群体均受瘦肉型群体血缘影响较小,血缘较纯,平均中国猪血缘比例大于90%,保种情况较好。综上,广东省各地方猪保种场后期应加强对地方猪的扩繁和选育工作,在保持血缘纯度稳定的情况下,降低近交程度。

关键词: 华南地方猪, SNP芯片, 保种, 遗传多样性, 群体遗传结构

Abstract:

This study aimed to reveal the conservation status of the 4 major local pig breeds in Guangdong Province, evaluate the genetic structure for their conservation populations, and provide guidance for protection and utilization of local pig genetic resources. In 2023, a total of 488 pigs from 6 conservation farms representing the 4 major local pig breeds in Guangdong Province were sampled (92 Xinfeng Large black-white pigs, 34 Xinfeng Lantang pigs, 68 Zijin Lantang pigs, 77 Lejiazhuang Small-ear Spotted pigs, 109 Yihao Small-ear Spotted pigs, and 108 Beica Yuedong Black pigs). Samples were genotyped using a 50K SNP chip and compared with 41 pig breeds, including European wild boars, Western Commercial pigs, South China local pigs, and other Chinese local pigs, in total 2 144 individuals. After quality control, 20 590 SNP loci were retained. Genetic diversity, inbreeding status, ancestry composition and family structure analyses were conducted. The results showed that the inbreeding coefficient (F) of Xinfeng Large black-white pigs was 0.409, observed heterozygosity (Ho) was 0.181, expected heterozygosity (He) was 0.172, the total length of runs of homozygosity (ROH) was 475.81 Mb, linkage disequilibrium (LD) length was 467.88 kb, the average FROH was 0.212, and the population was divided into 5 families. The inbreeding coefficient (F) of Xinfeng Lantang pigs was 0.316, Ho was 0.210, He was 0.189, ROH length was 441.76 Mb, LD length was 475.78 kb, FROH was 0.201, and the population was divided into 4 families. The inbreeding coefficient (F) of Zijin Lantang pigs was 0.239, Ho was 0.233, He was 0.218, ROH length was 224.13 Mb, LD length was 463.53 kb, FROH was 0.100, and the population was divided into 5 families. The inbreeding coefficient (F) of Lejiazhuang Small-ear Spotted pigs was 0.319, Ho was 0.208, He was 0.221, ROH length was 262.62 Mb, LD length was 460.88 kb, FROH was 0.117, and the population was divided into 7 families. The inbreeding coefficient (F) of Yihao Small-ear Spotted pigs was 0.435, Ho was 0.173, He was 0.171, ROH length was 113.41 Mb, LD length was 418.59 kb, FROH was 0.051, and the population was divided into 6 families. The inbreeding coefficient (F) of Beica Yuedong Black pigs was -0.028, Ho was 0.314, He was 0.300, ROH length was 247.47 Mb, LD length was 467.88 kb, FROH was 0.110, and the population was divided into 5 families. Ancestry composition analysis of each conservation population showed that, except for the Yuedong Black pig population, which was still significantly genetically influenced by Western commercial pig ancestry with an average Chinese pig ancestry proportion of 69.37%, the other 4 populations had less Western commercial pig ancestry, with an average Chinese pig ancestry proportion greater than 90%. In summary, conservation farms for local pig breeds in Guangdong Province should focus more on increasing the population size and improving breeding scheme within captivity, aiming to reduce the degree of inbreeding while maintaining stable genetic integrity.

Key words: South China local pigs, SNP chip, conservation population, genetic diversity, population genetic structure

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