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Exploring haplotype block structure, runs of homozygosity, and effective population size among dairy cattle breeds of India

The present study aimed to explore haplotype structure, runs of homozygosity (ROH), effective population size and persistence of gametic phase among three indigenous dairy cattle breeds, viz., Sahiwal ( n  = 19), Tharparkar ( n  = 17), and Gir ( n  = 16) by using BovineHD single nucleotide polymorph...

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Published in:Tropical animal health and production 2023-04, Vol.55 (2), p.129-129, Article 129
Main Authors: Dash, Soumya, Singh, Avtar, Dixit, S. P., Kumar, Avnish, Behera, Rajalaxmi
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Singh, Avtar
Dixit, S. P.
Kumar, Avnish
Behera, Rajalaxmi
description The present study aimed to explore haplotype structure, runs of homozygosity (ROH), effective population size and persistence of gametic phase among three indigenous dairy cattle breeds, viz., Sahiwal ( n  = 19), Tharparkar ( n  = 17), and Gir ( n  = 16) by using BovineHD single nucleotide polymorphism (SNP) genotyping assay. The filtered SNPs after quality control ranged from 44% in Sahiwal to 53% in Gir. The highest number of haplotype blocks was observed in Tharparkar (15,640) and the lowest in Sahiwal (8027) spanning 17.3% and 7.8% of genome, respectively. The average block length was found close to 26 kb which suggests that multiple recombination events fragmented the ancestral haplotypes into smaller sizes. Gir cattle had the largest number of runs of homozygosity (ROH) regions (1762) followed by Tharparkar (1528) and Sahiwal (1138). Without pedigree information, inbreeding coefficients estimated from ROH (F ROH ) revealed that Gir had the highest F ROH (0.099) proposing more inbreeding rate in this population. Effective population size (N e ) decreased slowly over the last 60 generations and at 13 generations ago; N e was estimated as 70 for all the three dairy breeds. The highest gametic phase correlation ( r  = 0.78) was observed for Sahiwal and Tharparkar breed pair suggesting formulation of multi-breed reference population for successful implementation of genomic selection among dairy breeds. The decline in effective population size among native Indian cattle breeds may help in formulating strategies for conservation and genetic improvement of native germplasm for future use.
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subjects Animals
Biomedical and Life Sciences
Cattle
Cattle - genetics
Dairy cattle
effective population size
Genetic improvement
genome
Genotype
Genotyping
Germplasm
Haplotypes
Homozygosity
Homozygote
Inbreeding
India
Life Sciences
marker-assisted selection
Nucleotides
pedigree
Polymorphism
Polymorphism, Single Nucleotide
Population decline
Population Density
Population number
Quality control
Recombination
Regular Articles
Sahiwal
Single-nucleotide polymorphism
Veterinary Medicine/Veterinary Science
Zoology
title Exploring haplotype block structure, runs of homozygosity, and effective population size among dairy cattle breeds of India
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