TY  - JOUR
AU  - Stojiljković, Nenad
AU  - Radojković, Dragan
AU  - Luković, Zoran
AU  - Gogić, Marija
AU  - Radović, Čedomir
AU  - Popovac, Mladen
AU  - Škroput, Dubravko
PY  - 2022-10-06
UR  - http://r.istocar.bg.ac.rs/handle/123456789/808
AB  - Simple Summary: In the Republic of Serbia, pig selection in recent decades has been based on
genetic improvement of growth and carcass quality traits. Genetic improvement of reproductive traits of pigs was based on the so-called phenotypic selection. The introduction of modern information systems and the availability larger dataset have opened the possibility to perform genetic estimation of reproductive traits within the main breeding programme of the Republic of Serbia. Using the methods of gene flow and connectedness evaluation, our study investigated the possibility of improving the reliability of estimating the breeding value of reproductive traits in highly productive sows. We believe that these methods could lead to a systematic improvement of the genetic value of reproductive traits in sows. Thus far, none of the methods for estimating the degree of connectedness between herds in pigs has been used in the preparation of the National Breeding Programme of the Republic of Serbia.
Abstract: This study investigated the influence of the degree of connectedness on the reliability of
the estimated breeding values (EBVs). The focal trait in the study was the number of piglets born
alive (NBA) from sows of the highly prolific Large White and Landrace sows. An analysis included
total of 58,043 farrowing’s during the 2008–2020 period. BLUP procedure was used to estimate the breeding values for NBA for the three herds separately and after merging all three herds into one herd. The model for EBV estimation included the following fixed factors: parity, genotype, seasons, litter sire, herds, sow age at farrowing, weaning-conception interval, length of previous lactation, and the following random effects: common litter environment, permanent litter environment, and direct additive genetic effect of animal. Heritability values for NBA ranged from 0.048 to 0.097, depending on the data included in the analysis. The connectedness between herds was analysed using the connectedness rating (CR) and the gene flow (GF) methods. CR among the observed herds ranged from 0.245 to 0.994%, depending on the data included. The exchange of genetic material between all three herds was determined using GF method. The high degree of connectedness determined by the CR and GF method had a strong effect on EBV reliability. The average EBV reliability ranged from 0.520 to 0.867, depending on the data included. The increase in average reliability was observed in both cases when the data were added, both in the analysis of average reliability for purebred animals and when crossbreeds were added, where an increase in this value was also observed. The increase in average EBV reliability is a consequence of the greater amount of information included in the joint evaluation. In conclusion, we believe that our research will improve EBV reliability and help in further selection work in the Republic of Serbia.
PB  - MDPI
T1  - Case Study on Increasing Breeding Value Estimation Reliability of Reproductive Traits in Serbian Highly Prolific Large White and Landrace Sows
VL  - 12
VL  - https://doi.org/10.3390/ani12192688
DO  - https://doi.org/10.3390/ani12192688
ER  - 

@article{
author = "Stojiljković, Nenad and Radojković, Dragan and Luković, Zoran and Gogić, Marija and Radović, Čedomir and Popovac, Mladen and Škroput, Dubravko",
year = "2022-10-06",
abstract = "Simple Summary: In the Republic of Serbia, pig selection in recent decades has been based on
genetic improvement of growth and carcass quality traits. Genetic improvement of reproductive traits of pigs was based on the so-called phenotypic selection. The introduction of modern information systems and the availability larger dataset have opened the possibility to perform genetic estimation of reproductive traits within the main breeding programme of the Republic of Serbia. Using the methods of gene flow and connectedness evaluation, our study investigated the possibility of improving the reliability of estimating the breeding value of reproductive traits in highly productive sows. We believe that these methods could lead to a systematic improvement of the genetic value of reproductive traits in sows. Thus far, none of the methods for estimating the degree of connectedness between herds in pigs has been used in the preparation of the National Breeding Programme of the Republic of Serbia.
Abstract: This study investigated the influence of the degree of connectedness on the reliability of
the estimated breeding values (EBVs). The focal trait in the study was the number of piglets born
alive (NBA) from sows of the highly prolific Large White and Landrace sows. An analysis included
total of 58,043 farrowing’s during the 2008–2020 period. BLUP procedure was used to estimate the breeding values for NBA for the three herds separately and after merging all three herds into one herd. The model for EBV estimation included the following fixed factors: parity, genotype, seasons, litter sire, herds, sow age at farrowing, weaning-conception interval, length of previous lactation, and the following random effects: common litter environment, permanent litter environment, and direct additive genetic effect of animal. Heritability values for NBA ranged from 0.048 to 0.097, depending on the data included in the analysis. The connectedness between herds was analysed using the connectedness rating (CR) and the gene flow (GF) methods. CR among the observed herds ranged from 0.245 to 0.994%, depending on the data included. The exchange of genetic material between all three herds was determined using GF method. The high degree of connectedness determined by the CR and GF method had a strong effect on EBV reliability. The average EBV reliability ranged from 0.520 to 0.867, depending on the data included. The increase in average reliability was observed in both cases when the data were added, both in the analysis of average reliability for purebred animals and when crossbreeds were added, where an increase in this value was also observed. The increase in average EBV reliability is a consequence of the greater amount of information included in the joint evaluation. In conclusion, we believe that our research will improve EBV reliability and help in further selection work in the Republic of Serbia.",
publisher = "MDPI",
title = "Case Study on Increasing Breeding Value Estimation Reliability of Reproductive Traits in Serbian Highly Prolific Large White and Landrace Sows",
volume = "12, https://doi.org/10.3390/ani12192688",
doi = "https://doi.org/10.3390/ani12192688"
}

Stojiljković, N., Radojković, D., Luković, Z., Gogić, M., Radović, Č., Popovac, M.,& Škroput, D.. (2022-10-06). Case Study on Increasing Breeding Value Estimation Reliability of Reproductive Traits in Serbian Highly Prolific Large White and Landrace Sows. 
MDPI., 12.
https://doi.org/https://doi.org/10.3390/ani12192688

Stojiljković N, Radojković D, Luković Z, Gogić M, Radović Č, Popovac M, Škroput D. Case Study on Increasing Breeding Value Estimation Reliability of Reproductive Traits in Serbian Highly Prolific Large White and Landrace Sows. 2022;12.
doi:https://doi.org/10.3390/ani12192688 .

Stojiljković, Nenad, Radojković, Dragan, Luković, Zoran, Gogić, Marija, Radović, Čedomir, Popovac, Mladen, Škroput, Dubravko, "Case Study on Increasing Breeding Value Estimation Reliability of Reproductive Traits in Serbian Highly Prolific Large White and Landrace Sows", 12 (2022-10-06),
https://doi.org/https://doi.org/10.3390/ani12192688 . .

TY  - JOUR
AU  - Zorc, Minja
AU  - Škorput, Dubravko
AU  - Gvozdanović, Kristina
AU  - Margeta, Polona
AU  - Karolyi, Danijel
AU  - Luković, Zoran
AU  - Salajpal, Krešimir
AU  - Savić, Radomir
AU  - Munoz, Maria
AU  - Bovo, Samuele
AU  - Đurkin Kušec, Ivona
AU  - Radović, Čedomir
AU  - Kušec, Goran
AU  - Čandek Potokar, Marjeta
AU  - Dovč, Peter
PY  - 2022
UR  - http://r.istocar.bg.ac.rs/handle/123456789/818
AB  - Background: The importance of local breeds as genetic reservoirs of valuable genetic variation is well established.
Pig breeding in Central and South-Eastern Europe has a long tradition that led to the formation of several local
pig breeds. In the present study, genetic diversity parameters were analysed in six autochthonous pig breeds from
Slovenia, Croatia and Serbia (Banija spotted, Black Slavonian, Turopolje pig, Swallow-bellied Mangalitsa, Moravka
and Krskopolje pig). Animals from each of these breeds were genotyped using microsatellites and single nucleotide
polymorphisms (SNPs). The results obtained with these two marker systems and those based on pedigree data were
compared. In addition, we estimated inbreeding levels based on the distribution of runs of homozygosity (ROH) and
identifed genomic regions under selection pressure using ROH islands and the integrated haplotype score (iHS).
Results: The lowest heterozygosity values calculated from microsatellite and SNP data were observed in the Turopolje pig. The observed heterozygosity was higher than the expected heterozygosity in the Black Slavonian, Moravka
and Turopolje pig. Both types of markers allowed us to distinguish clusters of individuals belonging to each breed.
The analysis of admixture between breeds revealed potential gene fow between the Mangalitsa and Moravka, and
between the Mangalitsa and Black Slavonian, but no introgression events were detected in the Banija spotted and
Turopolje pig. The distribution of ROH across the genome was not uniform. Analysis of the ROH islands identifed
genomic regions with an extremely high frequency of shared ROH within the Swallow-bellied Mangalitsa, which
harboured genes associated with cholesterol biosynthesis, fatty acid metabolism and daily weight gain. The iHS
approach to detect signatures of selection revealed candidate regions containing genes with potential roles in reproduction traits and disease resistance.
Conclusions: Based on the estimation of population parameters obtained from three data sets, we showed the
existence of relationships among the six pig breeds analysed here. Analysis of the distribution of ROH allowed us to
estimate the level of inbreeding and the extent of homozygous regions in these breeds. The iHS analysis revealed
genomic regions potentially associated with phenotypic traits and allowed the detection of genomic regions under
selection pressure.
PB  - BMC
T2  - Genetic Selection Evolution
T1  - Genetic diversity and population structure of six autochthonous pig breeds from Croatia, Serbia, and Slovenia
DO  - https://doi.org/10.1186/s12711-022-00718-6
ER  - 

@article{
author = "Zorc, Minja and Škorput, Dubravko and Gvozdanović, Kristina and Margeta, Polona and Karolyi, Danijel and Luković, Zoran and Salajpal, Krešimir and Savić, Radomir and Munoz, Maria and Bovo, Samuele and Đurkin Kušec, Ivona and Radović, Čedomir and Kušec, Goran and Čandek Potokar, Marjeta and Dovč, Peter",
year = "2022",
abstract = "Background: The importance of local breeds as genetic reservoirs of valuable genetic variation is well established.
Pig breeding in Central and South-Eastern Europe has a long tradition that led to the formation of several local
pig breeds. In the present study, genetic diversity parameters were analysed in six autochthonous pig breeds from
Slovenia, Croatia and Serbia (Banija spotted, Black Slavonian, Turopolje pig, Swallow-bellied Mangalitsa, Moravka
and Krskopolje pig). Animals from each of these breeds were genotyped using microsatellites and single nucleotide
polymorphisms (SNPs). The results obtained with these two marker systems and those based on pedigree data were
compared. In addition, we estimated inbreeding levels based on the distribution of runs of homozygosity (ROH) and
identifed genomic regions under selection pressure using ROH islands and the integrated haplotype score (iHS).
Results: The lowest heterozygosity values calculated from microsatellite and SNP data were observed in the Turopolje pig. The observed heterozygosity was higher than the expected heterozygosity in the Black Slavonian, Moravka
and Turopolje pig. Both types of markers allowed us to distinguish clusters of individuals belonging to each breed.
The analysis of admixture between breeds revealed potential gene fow between the Mangalitsa and Moravka, and
between the Mangalitsa and Black Slavonian, but no introgression events were detected in the Banija spotted and
Turopolje pig. The distribution of ROH across the genome was not uniform. Analysis of the ROH islands identifed
genomic regions with an extremely high frequency of shared ROH within the Swallow-bellied Mangalitsa, which
harboured genes associated with cholesterol biosynthesis, fatty acid metabolism and daily weight gain. The iHS
approach to detect signatures of selection revealed candidate regions containing genes with potential roles in reproduction traits and disease resistance.
Conclusions: Based on the estimation of population parameters obtained from three data sets, we showed the
existence of relationships among the six pig breeds analysed here. Analysis of the distribution of ROH allowed us to
estimate the level of inbreeding and the extent of homozygous regions in these breeds. The iHS analysis revealed
genomic regions potentially associated with phenotypic traits and allowed the detection of genomic regions under
selection pressure.",
publisher = "BMC",
journal = "Genetic Selection Evolution",
title = "Genetic diversity and population structure of six autochthonous pig breeds from Croatia, Serbia, and Slovenia",
doi = "https://doi.org/10.1186/s12711-022-00718-6"
}

Zorc, M., Škorput, D., Gvozdanović, K., Margeta, P., Karolyi, D., Luković, Z., Salajpal, K., Savić, R., Munoz, M., Bovo, S., Đurkin Kušec, I., Radović, Č., Kušec, G., Čandek Potokar, M.,& Dovč, P.. (2022). Genetic diversity and population structure of six autochthonous pig breeds from Croatia, Serbia, and Slovenia. in Genetic Selection Evolution
BMC..
https://doi.org/https://doi.org/10.1186/s12711-022-00718-6

Zorc M, Škorput D, Gvozdanović K, Margeta P, Karolyi D, Luković Z, Salajpal K, Savić R, Munoz M, Bovo S, Đurkin Kušec I, Radović Č, Kušec G, Čandek Potokar M, Dovč P. Genetic diversity and population structure of six autochthonous pig breeds from Croatia, Serbia, and Slovenia. in Genetic Selection Evolution. 2022;.
doi:https://doi.org/10.1186/s12711-022-00718-6 .

Zorc, Minja, Škorput, Dubravko, Gvozdanović, Kristina, Margeta, Polona, Karolyi, Danijel, Luković, Zoran, Salajpal, Krešimir, Savić, Radomir, Munoz, Maria, Bovo, Samuele, Đurkin Kušec, Ivona, Radović, Čedomir, Kušec, Goran, Čandek Potokar, Marjeta, Dovč, Peter, "Genetic diversity and population structure of six autochthonous pig breeds from Croatia, Serbia, and Slovenia" in Genetic Selection Evolution (2022),
https://doi.org/https://doi.org/10.1186/s12711-022-00718-6 . .