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South African Journal of Animal Science

versão On-line ISSN 2221-4062
versão impressa ISSN 0375-1589

S. Afr. j. anim. sci. vol.49 no.6 Pretoria  2019

http://dx.doi.org/10.4314/sajas.v49i6.6 

Genetic diversity and differentiation among Korean-Holstein, Hanwoo, and Uganda-Holstein breeds

 

 

G. BigirwaI, II; D. KimII; O. AcaiI; C. NaII; J. OhII; K. SongII, III, #

ICollege of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Uganda
IIDepartment of Animal Biotechnology, Jeonbuk National University, Jeonju 54896, Korea
IIIDepartment of Animal Science, Feeds and Animal Nutrition, Faculty of Agriculture, Ankara University, Ankara, 06110, Turkey

 

 


ABSTRACT

The aim of this research was to assess genetic diversity of Korean-Holstein, Korean Hanwoo, and Ugandan-Holstein dairy cattle. DNA was extracted from either blood or hair of Korean-Holstein (n=74), Korean-Hanwoo (n=75) and Ugandan-Holstein (N=77) using AccuPrep® PCR purification kit. The DNA samples were amplified by multiplex polymerase chain reaction, using GeneTrack MHanwoo genotyping kit and assayed using ABI genetic analyser 3130XL. Number of alleles, expected heterozygosity (He), observed heterozygosity (Ho), and the polymorphism information content (PIC) were estimated from 10 microsatellite loci in the three breeds. In addition, F-statistics for each of the 10 microsatellites in the three cattle breeds were estimated using fstat version 2.9.3.2 computer program. GENETIX (v.4.02) was used to perform factorial correspondence analysis (FCA) from the allele frequencies and multi-locus clustering was done using STRUCTURE analyses. A total of 124 alleles were detected. The number of alleles per locus varied from eight (TGLA126) to 22 (TGLA122), with an overall mean of 12.2. Expected heterozygosity ranged from 0.617 (SPS115) to 0.854 (TGLA53) and averaged 0.761. Observed heterozygosity ranged from 0.6 (SPS115) to 0.859 (TGLA53); and averaged 0.761. The mean PIC was 0.723; and means of the F-statistics FIT, FST and FIS were 0.077, 0.076 and 0.001 respectively. Although FCA revealed clear differentiation of Uganda-Holstein, Korean-Holstein, and Hanwoo, clustering assignments showed genetic admixture between Ugandan dairy cattle (Uganda-Holstein) and Hanwoo. In conclusion, the allelic variation present at the 10 loci was sufficient to categorize these cattle into distinct breed groups.

Keywords: dairy cattle, genetic differentiation, F-statistics, heterozygosity, microsatellite


 

 

Introduction

Genetic improvement of dairy cattle is considered indispensable to increasing milk production and fostering animals' adaptability to farming environments in many countries around the world (Olesen et al., 2000; Rischkowsky & Pilling, 2007). For this reason, several breeding programmes have chosen to employ a few high-producing dairy animals as parent stock, which are multiplied with assisted reproductive technologies (Goddard & Hayes, 2007; Schefers & Weigel, 2012). At the same time, the necessity to clearly define breed-specific attributes through genomic studies among cattle populations has been pointed out as a key factor for sustainable dairy genetic improvement programmes (Kim et al., 2017; Tixier-Boichard et al., 2015). Moreover, genomic studies have been used to assess the levels of genetic diversity of cattle breeds, which is necessary for conserving breeds and designing future genetic improvement programmes (Biscarini et al., 2015).

DNA-based tools such as microsatellite analyses have been developed and are now widely used for genetic diversity assessment in dairy breeding programmes (Silva et al., 2014). Additionally, microsatellite markers are used for identification of parental lineages (Erhardt & Weimann, 2007), mapping genes for economically important traits (Goddard & Hayes, 2007; Naicy, 2008), and aiding in marker-assisted selection (MAS) (Oltenacu & Broom, 2010; Schefers & Weigel, 2012). Microsatellites have been commended for use in genetic diversity studies because of their accuracy, versatility, abundancy and being spread over the entire genome (Agung et al., 2019; Erhardt & Weimann, 2007).

Worldwide, the Holstein-Friesian is regarded as the highest milk producing breed of cattle (Oltenacu & Broom, 2010; Robinson et al., 2011). In Uganda, dairy cattle constitute only 6-7% of the national herd, and dairy genetic improvement has been implemented through crossbreeding with imported Holstein semen and embryos from foreign countries (Mugisha et al., 2014). In particular, the major dairy cattle breed in Uganda, which is also referred to as 'Uganda-Holstein', has been produced through crossbreeding Ankole with Holstein cattle. This programme has been implemented over the last 50 years (Galukande, 2010; Kim et al., 2017). However, this approach has not been supported with modern genomic tools to assess the genetic diversity of bred dairy cattle in Uganda and the introduced exotic dairy breeds. As part of the Ugandan dairy genetic improvement programme, the Korean-dairy breeding programme was launched in 2014 to improve dairy cattle production by using germplasm from Korean-Holstein. In this study, the authors used microsatellite markers to assess the genetic diversity of dairy cattle in Uganda in relation to Korean-Holstein and Korean-Hanwoo.

 

Materials and Methods

This study was conducted after a review by the Ethical Committee of the School of Veterinary Medicine and Animal Resources, Makerere University (Reference: SVARREC/10/2018), and approved for compliance with animal use standards. Approximately 50 tail-hairs were gathered and pulled firmly from the skin to secure hair-roots.

DNA was extracted from hair samples of Korean-Holstein (n=74), Hanwoo (n=75) and UgandaHolstein (n=77) using AccuPrep® PCR Purification Kit (Bioneer, SK). Ten microsatellites (Table 1), which are recommended by the International Society for Animal Genetics for parentage assessment in cattle were used. Microsatellites were amplified in multiplex PCR reactions using GeneTrackTM Hanwoo genotype kit (TNT Research, Republic of Korea) according to the manufacturer's instructions. The resultant fluorescent labelled PCR products were separated in the ABI genetic analyser 3500XL, as per the manufacturer's instructions. The number of alleles, observed heterozygosity (Ho) and expected heterozygosity (He), and polymorphism information content (PIC) were calculated for each microsatellite marker using the microsatellite tool kit (Park, 2001). Wright's F-statistics (FIS, F|T and FST) were calculated for each locus across the three breed populations using the fstat version 2.9.3.2 computer program (Goudet, 2002). GENETIX (version 4.02) program was used to perform factorial correspondence analysis (Belkhir et al., 2001). Clustering assignments of the three breeds were obtained by using STRUCTURE version 2.3.4 (Pritchard et al., 2000).

 

Results

The number of alleles, HE, HO and PIC for the three cattle breed populations are shown in Table 2. A total of 124 alleles were detected at 10 microsatellite loci across the three breeds. The number of alleles at each locus varied between eight (TGLA126) and 22 (TGLA122), with an overall mean allele number of 12.2. Expected heterozygosity ranged between 0.617 (SPS115) and 0.854 (TGLA53) with an average of 0.761. Observed heterozygosity varied between 0.6 (SPS115) and 0.859 (TGLA53), with a mean of 0.761. The mean PIC was 0.723.

Microsatellite polymorphism results for individual cattle breed are shown in Table 3. The UgandaHolstein showed the greatest overall HE (0.799) and the Korean-Holstein had the lowest HE (0.717). Observed heterozygosity was greatest in Hanwoo (0.811) and lowest in Korean-Holstein.

The estimates of PIC and F-statistics (FIS, F|T and FST) are shown in Table 4. Overall, the mean PIC was higher in Uganda-Holstein than in Korea-Holstein and Hanwoo. Moreover, PIC results from all microsatellite loci were still higher in Uganda-Holstein than in Korea-Holstein and Hanwoo. The total inbreeding estimates per locus (FIT) ranged from 0.003 (ETH10) to 0.214 (ETH225) across the three breed populations, with the overall mean of 0.077. The lowest and highest within-population inbreeding estimate values (FIS) were -0.005 (TGLA52) and 0.088 (ETH225), respectively. Genetic differentiation (FST) was observed in all markers, with the highest estimate in ETH3 marker.

The factorial correspondence analysis of allele frequencies for the 10 microsatellite loci revealed the very clear separation between the Uganda-Holstein, Korean-Holstein and Hanwoo (Figure 1). The FCA plot shows 62% of total variance was accounted for by Axis 1, and 32% was explained by Axis 2, which in large part separated Uganda-Holstein from Korean-Holstein and Hanwoo. Multi-locus clustering structure of the three populations is shown in Figure 2. The breeds were clearly separated into three distinct groups.

 

Discussion

The number of microsatellite alleles at each locus has been used to assess genetic diversity and between-breed relationships (Egito et al., 2007; Mateus et al., 2004; Suh et al., 2014; Stevanovic et al., 2010). The overall mean allele number per locus was comparable with previous results, which varied from 5 to 16 (Egito et al., 2007; Freeman et al., 2004; Mateus et al., 2004; Stevanovic et al., 2010; Suh et al., 2014, Zhao et al., 2017). Additionally, it has been suggested that individual microsatellite markers that are used to assess genetic diversity should have at least four alleles in order to generate reliable information (Barker, 1994; Shi et al., 2010). Here, the number of alleles per locus satisfies this recommendation. Although 30 loci are recommended for genetic diversity studies in cattle (Erhardt & Weimann, 2007), the use of 10 microsatellite markers in this study was able to differentiate the three breeds of cattle adequately. Similarly, proven genetic diversity studies among cattle breeds have been undertaken using 10 microsatellites (Zhou et al., 2005; Cervini et al., 2006).

In general, the levels of heterozygosity (He and Ho) that were observed in this study are similar to previous reports (Agung et al., 2019; Egito et al., 2007; Freeman et al., 2004; Suh et al., 2014; Zhao et al., 2017). Given that these observed levels of heterozygosity were greater than 0.5, this indicates that the 10 microsatellite markers are suitable for genetic diversity studies in the three dairy breeds (Sheriff & Alemayehu, 2017).

The estimates of He and Ho in Hanwoo and Korean-Holstein that were observed in this study were similar to or slightly greater than those reported previously for the two breeds (Hanwoo: He = 0.713 to 0.740 and Ho = 0.68 to 0.7442; and Korean-Holstein: He = 0.701 to 0.7361 and Ho = 0.715 to 0.753) (Kim et al., 2002, Shi et al., 2010, Suh et al., 2014). Any perceived discrepancy in He and Ho among studies could be as a result of differences in the numbers of animals and in the laboratory settings, which could lead to genotyping errors (Egito et al., 2007; Suh et al., 2014). The Korean Holstein group that was characterized in this study was found to be less heterozygous than the Hanwoo cattle, in agreement with Choi et al. (2012). Compared with the Hanwoo and Korean-Holstein, the value of He in Uganda-Holstein was greater than Ho for nine of the microsatellites (Table 3). This observed greater He compared with Ho in Uganda-Holstein could be attributed to haphazard and unregulated breeding practices among Uganda dairy cattle herds (Mugisha et al., 2014). In the present study, a low estimate of genetic differentiation (FST=0.076) between the studied breeds was identified, indicating that the three cattle breed populations could have close proximity and share the same ancestry. These populations are all taurine breeds and could have common alleles in their genomes. An inbreeding coefficient (FIS) of 1% identified in this study could be an indication of limited inbreeding within the three populations. Moreover, there was a significant shortfall in the total inbreeding estimates (mean FIT=0.077) across the three populations. However, the indices of F-statistics (FIS, FST and FIT) that were obtained in the current study population were equivalent to those reported among taurine breeds (Suh et al., 2014; Mateus et al., 2004). The PIC values for the 10 markers in this study ranged between 0.578 (SPS115) and 0.832 (TGLA53) (Table 4), suggesting that the microsatellite markers used in this study were informative.

The clear separation between the Uganda-Holstein, Korean-Holstein and Hanwoo that is revealed in the FCA (Figure 1) suggests that these breeds are distinct. A previous study on the genetic structure of Korean native breeds revealed similar findings for Hanwoo and Korean-Holstein (Suh et al., 2014). In this study, the Ugandan-Holstein was clearly separated from Hanwoo and Korean-Holstein. The differences in the level of alleles that are present in animals have been shown to contribute to distinction between breeds (Egito et al., 2007; Mateus et al., 2004). The results from the current study therefore suggest that each of the breeds has distinct genetic characteristics, which can be utilized when designing conservation and breeding programmes. A previous study using single nucleotide polymorphisms (SNPs) revealed genetic heterogeneity and shared ancestry between Ankole cattle and other taurine breeds, including Hanwoo (Kim et al., 2017). Most dairy cattle in Uganda are products of crossbreeding Holstein with Ankole cattle (Galukande, 2010; Kim et al., 2017).

 

Conclusion

From the present study, all 10 markers displayed a significant abundance of heterozygosity and were effective in determining the genetic diversity of the three breeds. The alleles identified in this study were able to separate the breeds into three distinct clusters, that is, Korean-Holstein, Uganda-Holstein and Hanwoo. Further comparative studies on historical, cultural, animal phenotype and environmental aspects regarding breeding programmes in these breeds are recommended.

 

Acknowledgements

This work was supported by grants from the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry (IPET) funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA, 316084 - 03), Republic of Korea, and the Next-Generation BioGreen 21 Program (No. PJ01315101), Rural Development Administration, Republic of Korea.

Authors' Contributions

KDS, JOA and JDO designed the study, GB collected the blood samples and isolated the DNA. GB, DHK, JDO and CSN performed the molecular genetic and statistical analyses. All authors contributed to manuscript writing.

Conflict of Interest Declaration

The authors declare that they have no conflict of interest.

 

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Received 2 July 2019
Accepted 22 November 2019
First published online 1 January 2020

 

 

# Corresponding Authors: oh5ow@naver.com, kiduk.song@jbnu.ac.kr

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