Article(id=1307013252517482758, tenantId=1146029695717560320, journalId=1306274286668972124, issueId=1307013104081068276, articleNumber=null, orderNo=null, doi=10.11843/j.issn.0366-6964.2026.02.013, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1748188800000, receivedDateStr=2025-05-26, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1789545842531, onlineDateStr=2026-09-16, pubDate=1771776000000, pubDateStr=2026-02-23, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789545842531, onlineIssueDateStr=2026-09-16, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789545842531, creator=13701087609, updateTime=1789545842531, updator=13701087609, issue=Issue{id=1307013104081068276, tenantId=1146029695717560320, journalId=1306274286668972124, year='2026', volume='57', issue='2', pageStart='569', pageEnd='1176', issueExtLink='null', onlineDate='null', pubDate='1771776000000', pubDateStr='2026-02-23', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1789545807142, creator='13701087609', updateTime=1789609910854, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1307281975350419753, tenantId=1146029695717560320, journalId=1306274286668972124, issueId=1307013104081068276, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1307281975350419754, tenantId=1146029695717560320, journalId=1306274286668972124, issueId=1307013104081068276, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=716, endPage=727, ext={EN=ArticleExt(id=1307013252723003655, articleId=1307013252517482758, tenantId=1146029695717560320, journalId=1306274286668972124, language=EN, title=Accuracy of Maternal Grandsire Discovery Based on Haplotype Matching Rate, columnId=1307007413870158054, journalTitle=Acta Veterinaria et Zootechnica Sinica, columnName=ANIMAL GENETICS AND BREEDING, runingTitle=null, highlight=null, articleAbstract=
This study aimed to develop a haplotype-segment matching-based maternal grandsire discovery approach applicable to different SNP array densities and segment window sizes in the absence of dam genotypes, thereby providing a reliable technical approach for pedigree reconstruction. The study utilized genomic data from 6 117 dairy cows to construct datasets of varying SNP densities, including low-density (5K, 10K) and medium-density (20K, 50K) SNP panels. For each dataset, the genome was partitioned into fixed-length haplotype segments of 5, 10, 35, 75, and 120 SNPs, followed by haplotype inference. Based on the known genotypes of the offspring's sire, paternal haplotypes were excluded to infer maternal haplotypes, which were then compared with those of candidate bulls on a segment-by-segment basis to calculate the haplotype matching rate (HMR). The bull with the highest HMR was designated as the putative maternal grandsire (MGS). A total of 345 individuals with complete and validated pedigree information were used to verify method accuracy. Furthermore, genomic relatedness coefficients and homozygosity levels were calculated to investigate the potential effects of kinship structure and inbreeding on identification outcomes. The haplotype-segment matching method achieved more than 90% assignment accuracy across most combinations of SNP-array density and segment window length. The 20K array with a 35-SNPs window yielded the highest accuracy at 98%, demonstrating robust performance. Nonetheless, the optimal decision thresholds for the haplotype match rate and the resulting accuracies varied substantially with parameter settings, indicating that SNP density and window length were key determinants of performance. Additional analyses showed that kinship structure and inbreeding levels significantly affected matching performance and assignment accuracy, suggesting that the population genetic background should be considered in practical applicatons. The haplotype-segment matching (HSM)-based method demonstrated high accuracy in maternal grandsire identification under conditions of missing maternal genotype data, making it a valuable tool for pedigree correction in large-scale commercial herds. Optimizing SNP density and haplotype window length based on the genetic background of the population is essential to enhance identification efficiency and robustness in practical applications.
, authors=Jiandong LOU
1, Jingfang SI
1, Jia TIAN
2, Li'e HOU
2, Jiamin ZHOU
2, Yachun WANG
1, Yi ZHANG
1, authorsList=Jiandong LOU, Jingfang SI, Jia TIAN, Li'e HOU, Jiamin ZHOU, Yachun WANG, Yi ZHANG, authorCompany=null, correspAuthors=Yi ZHANG, authorNote=null, correspAuthorsNote=
, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1307013255549964562, articleId=1307013252517482758, tenantId=1146029695717560320, journalId=1306274286668972124, language=CN, title=基于单倍型匹配率鉴定系谱外祖父的准确性研究, columnId=1307007414092456168, journalTitle=畜牧兽医学报, columnName=遗传育种, runingTitle=null, highlight=null, articleAbstract=
旨在评估当母亲基因型数据缺失的情况下,不同芯片密度和单倍型窗口长度对外祖父识别准确性的影响,为利用基因组信息准确构建系谱关系提供可靠技术手段。本研究基于6 117头奶牛的基因组芯片数据,分别构建低密度芯片(5K、10K)和中等密度芯片(20K、50K)数据集,并设置5、10、35、75和120五种SNP窗口长度,将全基因组划分为连续的单倍型片段并进行单倍型推断。随后,结合子代个体已知的父本基因型信息,剔除与父源完全一致的单倍型片段以推断母源单倍型序列,并与候选公牛单倍型逐片段比对,计算单倍型匹配率,并选取匹配率最高的个体作为候选外祖父。同时,选取345头谱系信息完整可靠的个体用于方法准确性验证。此外,研究还进一步计算了个体的亲缘系数与近交系数,以揭示亲缘关系与近交对鉴定方法的潜在影响。结果表明,基于单倍型分段匹配的识别方法在绝大多数芯片密度与窗口长度的条件下,均可实现90%以上的鉴定准确率,其中20K×35 SNPs的组合表现最优,准确率高达98%,方法整体表现出较高的准确性与稳定性。然而,不同组合条件下的最优判定阈值和准确性存在明显差异,提示芯片密度与窗口长度对方法性能具有重要影响。进一步分析显示,亲缘关系与近交水平同样显著影响匹配效果与准确性,提示在实际应用中需综合考量群体遗传背景的影响。综上所述,该方法在母系信息缺失及大规模实际生产群体背景下展现出较高的鉴定准确性,可作为外祖父识别的有效手段。此外,结合群体遗传背景合理选择芯片密度与窗口长度是提升鉴定效果的关键。
, authors=娄建东
1, 司敬方
1, 田佳
2, 侯丽娥
2, 周佳敏
2, 王雅春
1, 张毅
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Distribution of haplotype matching rate (HMR) between the positive validation group (yellow) and the negative control group (blue) under different combinations of SNP chip density and haplotype window length, figureFileSmall=GzsfNszQG5WJwZohRXBVog==, figureFileBig=6jMvdzfPF4VwRYwoHmsPAg==, tableContent=null), ArticleFig(id=1307282248043094105, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=CN, label=图1, caption=
不同芯片密度与窗口长度组合下阳性验证组(黄色)与阴性对照组(蓝色)的单倍型匹配率(HMR)分布图, figureFileSmall=GzsfNszQG5WJwZohRXBVog==, figureFileBig=6jMvdzfPF4VwRYwoHmsPAg==, tableContent=null), ArticleFig(id=1307282248378638426, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=EN, label=Fig.2, caption=
The variation curve of haplotype matching rate (HMR) and maternal grandsire identification accuracy under different combinations of SNP chip density and haplotype window length, figureFileSmall=fXcFfClsk2JWu8d3ybkaeQ==, figureFileBig=IuUU2DRh56riTJV5y/+jHQ==, tableContent=null), ArticleFig(id=1307282248449941595, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=CN, label=图2, caption=
不同芯片密度与窗口长度组合下单倍型匹配率(HMR)与外祖父鉴定准确性的变化曲线, figureFileSmall=fXcFfClsk2JWu8d3ybkaeQ==, figureFileBig=IuUU2DRh56riTJV5y/+jHQ==, tableContent=null), ArticleFig(id=1307282248810651740, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=EN, label=Fig.3, caption=
Distribution of genomic relatedness coefficients between individuals and candidate maternal grandsires under different identification categories, figureFileSmall=2WgtoNlaJF3P4K4VWvbmTg==, figureFileBig=0I6j4BmHMFu4bl4z1v0GOg==, tableContent=null), ArticleFig(id=1307282248886149213, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=CN, label=图3, caption=
不同识别类型下个体与候选外祖父的基因组亲缘系数分布图, figureFileSmall=2WgtoNlaJF3P4K4VWvbmTg==, figureFileBig=0I6j4BmHMFu4bl4z1v0GOg==, tableContent=null), ArticleFig(id=1307282249209110622, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=EN, label=Fig.4, caption=
Distribution of homozygosity for the tested individuals under different identification categories, figureFileSmall=PHCapPbRU3BN0L4kdhqQyg==, figureFileBig=oYwgAYxSnNJ0yT444Q8zJg==, tableContent=null), ArticleFig(id=1307282249326551136, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=CN, label=图4, caption=
不同识别类型下待测个体的纯合度分布图, figureFileSmall=PHCapPbRU3BN0L4kdhqQyg==, figureFileBig=oYwgAYxSnNJ0yT444Q8zJg==, tableContent=null), ArticleFig(id=1307282249636929633, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=EN, label=Table 1, caption=
Composition and sample size of the experimental population
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| 组别 Group | 待测子代 Offspring | 对应父本 Sires of offspring | 真实外祖父 Confirmed MGS |
|---|
| 阳性验证组 Positive group | 224 | 101 | 98 |
| 阴性对照组 Negative group | 121 | 63 | 0 |
| 合计 Total | 345 | 164 | 98 |
), ArticleFig(id=1307282250052165730, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013252517482758, language=CN, label=表1, caption=
试验群体构成与样本数量
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| 组别 Group | 待测子代 Offspring | 对应父本 Sires of offspring | 真实外祖父 Confirmed MGS |
|---|
| 阳性验证组 Positive group | 224 | 101 | 98 |
| 阴性对照组 Negative group | 121 | 63 | 0 |
| 合计 Total | 345 | 164 | 98 |
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