scholarly journals Pedigree Analysis of Mangalica Pig Breeds

2016 ◽  
Vol 16 (3) ◽  
pp. 701-709 ◽  
Author(s):  
János Posta ◽  
Péter Szabó ◽  
István Komlósi
Keyword(s):  
Genetic Structure ◽  
Genetic Variability ◽  
Gene Pool ◽  
Reference Population ◽  
Pedigree Analysis ◽  
Small Populations ◽  
Gene Conservation ◽  
Generation Interval ◽  
Pig Breeds ◽  
Gene Origin

AbstractAn effective gene conservation programme requires the knowledge of genetic variability of the population. The genetic structure of Mangalica pig breeds (Blonde, Red and Swallow-bellied) was studied from pedigree records. Herdbook data available up to 2011 of registered Mangalica pig breeds (Blonde, Red and Swallow-bellied) were analysed. The number of complete generations was 6 for Blonde and 5 for Red and Swallow-bellied Mangalica whereas the average complete generation equivalent was between 3.51 and 6.01. The average level of inbreeding of the reference population was low (4.07–5.87%). The investigated breeds could be considered as small populations based on the probability of gene origin. The most important ancestor contributed between 9 and 16% of the gene pool of the reference populations. The longest generation interval was found for the sire-to-son pathways whereas the shortest for dam-to-daughter pathways for each breed.

Assessment of the genetic variability using pedigree analysis of the Sahiwal breed in Kenya

2016 ◽  
Vol 59 ◽  
pp. 7-14 ◽  
Author(s):  
S. Mwangi ◽  
T.K. Muasya ◽  
E.D. Ilatsia ◽  
A.K. Kahi
Keyword(s):  
Genetic Variability ◽  
Genetic Drift ◽  
Reference Population ◽  
Pedigree Analysis ◽  
Breeding Strategy ◽  
Progeny Testing ◽  
Founding Population ◽  
Effective Selection ◽  
Inbreeding Level ◽  
Year 2000

Summary Pedigree analysis using genealogical information of 18 315 animals born between 1949 and 2008 was done to quantify genetic variability of the Sahiwal population in Kenya. Generation intervals for sire pathways were longer than dam pathways and increased over year periods, from about 4–16 years. The later was due to use of old bulls for breeding in the last 2 year groups and cessation of progeny testing in the year 2000. Average inbreeding level in last year period studied was 1.2 percent. Genetic variability of the population as assessed based on gene origin statistics decreased over the years. The ratio of effective number of founders to founders of 0.06 showed unequal contribution of founders to the reference population. However, since the founding population, ancestors contributed equally as shown by the ratio of f e/f a of 0.94, which could also be due to lack of effective selection in this population. The ratio of f g/f a of 0.63 indicated genetic loss of genetic variability occurred through genetic drift in the Kenyan Sahiwal population. The small number of ancestors (16) that accounted for 50 percent of the total variation in the reference population suggested overuse of a small number of some animals as parents over generations. The smaller ratio of f g/f e compared with f a/f e also confirms loss of genetic variability in the population by genetic drift than bottlenecks. Therefore the breeding strategy for the Sahiwal population in Kenya should incorporate tools that balance rate of genetic gain and the future rate of inbreeding.

scholarly journals Estructura Genética de la Población de Llamas (Lama glama del Banco de Germoplasma del Instituto Nacional de Innovación Agraria -Perú

2016 ◽  
Vol 18 (1) ◽  
pp. 55
Author(s):  
Rubén Mamani Catoa ◽  
Roberto Gallegos Acero ◽  
Teodosio Huanca Mamani ◽  
Juan P Ablo Gutiérrez
Keyword(s):  
Genetic Structure ◽  
Reference Population ◽  
Critical Value ◽  
Inbreeding Coefficient ◽  
Gene Bank ◽  
Effective Number ◽  
Effective Population ◽  
Generation Interval ◽  
Average Ratio ◽  
Lama Glama

<p><strong>RESUMEN</strong></p><p>El objetivo del  estudio fue evaluar la estructura genética de la población de llamas, del Banco de Germoplasma  de  Quimsachata Estación Experimental Illpa-Puno del Instituto Nacional de Innovación Agraria, durante el año 2015<a href="#_msocom_1">[h1]</a> <a href="#_msocom_2">[h2]</a> . Se analizó el archivo de pedigrí de 4698 animales nacidos en el periodo 1993 al 2014, de los cuales 2075 fueron machos y 2623 hembras<a href="#_msocom_3">[h3]</a> . Para el cálculo de los coeficientes individuales de consanguinidad (<em>F</em>), coeficiente de relación media (<em>AR</em>), tamaño efectivo de la población (<em>N<sub>e</sub></em>), de fundadores (<em>f<sub>e</sub></em>)  de ancestros (<em>f<sub>a</sub></em>), intervalo generacional (IG) y la profundidad de pedigrí se ha utilizado el programa ENDOG v.4.8. Los resultados para coeficiente de consanguinidad media y el promedio de relación media de la población de llamas fueron 0.11 y 0.25% respectivamente. Del total de 906 ancestros que dieron origen a la población de referencia, 102 explican el 50% de la variabilidad genética de la población. El número efectivo de fundadores fue 508 y de ancestros 284. El intervalo generacional medio fue  5.65 años, siendo mayor en las vías gaméticas padre-hijo y padre-hija. Para el grado de profundidad de pedigrí fueron identificados 65.88% de animales con información sobre los padres y 83.95% sobre las madres. El tamaño efectivo de la población  fue de 281.81, este valor está por encima del valor crítico. En conclusión la consanguinidad en la población de llamas del banco de germoplasma fue de pequeña magnitud y que las prácticas de apareamiento fueron adecuadas durante el periodo evaluado.</p><p> </p><p><strong>ABSTRACT</strong></p><p>The objective of the study was to describe the genetic structure of the population of llama’s gene bank National Institute of Innovation Agrarian INIA-Puno. The pedigree file of 4698 animals born in the period 1993 to 2014, of which 2075 were males and 2623 females were analyzed. For the calculation of individual coefficients of inbreeding (<em>F</em>), coefficient average ratio (<em>AR</em>), effective population size (<em>N<sub>e</sub></em>), of founders (<em>f<sub>e</sub></em>)  of ancestors (<em>f<sub>a</sub></em>), generation interval (IG) and depth of pedigree has been used ENDOG v.4.8 program. The results for inbreeding coefficient average and average mean ratio of the population were 0.11 and 0.25 flames% respectively. Of the total of 906 ancestors that gave rise to the reference population, 102 account for 50% of the genetic variability of the population. The effective number of founders and ancestors was 508 284. The average generation interval was 5.65 years, being higher in the gametic roads father-son and father-daughter. For the degree of depth of pedigree they were identified 65.88% of animals with information about parents and 83.95% on mothers. The effective size of the population was 281.81, this value is above the critical value. In conclusion inbreeding in the population of llamas gene bank was small in magnitude and mating practices were adequate during the period evaluated.</p><div><hr align="left" size="1" width="33%" /><div><div><p> </p></div></div></div>

scholarly journals Evaluation of genetic variability of the breed Norik of Muran according to pedigree information

2018 ◽  
Vol 63 (No. 5) ◽  
pp. 195-200 ◽  
Author(s):  
M. Halo ◽  
E. Mlyneková ◽  
M. Horná ◽  
M. Ivančíková ◽  
A. Hrdá
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Average Length ◽  
Pedigree Information ◽  
Common Ancestry ◽  
Generation Interval ◽  
The Core ◽  
Equivalent Number ◽  
The Common ◽  
Gene Origin

The Norik of Muran, a unique draught horse bred in Slovakia, belongs to country’s biodiversity treasures. The genetic diversity of this horse type was evaluated on the basis of indicators derived from the common ancestry and the probability of gene origin. The pedigree file of the analyzed horses involved 115 individuals (15 stallions and 100 mares). The number of complete generations was 4.49 on average. The maximum number of ancestor generations at the examined population of living horses was 5.38 and the equivalent number in the generation of ancestors was 5.14. The highest average length of the generation interval was 10.97 years in the father–son direction compared to father–daughter (9.74), mother–son (10.87), and mother–daughter (8.99 years – the lowest average length). The generation interval overall average length was 10.14 years. The total coefficient of relatedness was 1.72% on average. The efficient number of core ancestors evenly used in breeding in comparison with the core ancestors mildly decreased to 198. Therefore the Austrian Norik incorporation in the breeding program is the opportunity how to maintain genetic diversity.

scholarly journals Genetic Variability of Cold-Blooded Horses Participating in Genetic Resources Conservation Programs, Using Pedigree Analysis

2019 ◽  
Vol 19 (1) ◽  
pp. 49-60 ◽  
Author(s):  
Grażyna Polak
Keyword(s):  
Genetic Variability ◽  
Genetic Resources ◽  
Reference Population ◽  
Pedigree Analysis ◽  
Pedigree Information ◽  
Effective Population ◽  
Conservation Programs ◽  
Data Set ◽  
Genetic Resources Conservation ◽  
Resources Conservation

AbstractTwo types of Polish local cold-blooded horses – Sztumski and Sokólski, covered by genetic resources conservation programs, were analyzed for founder’s contribution, genetic structure and inbreeding. In both populations, created in the early twentieth century, were used the same stallions, mainly Ardennes, Belgians and Bretons. The aim of the study was to analyze the genetic variability of Sztumski and Sokólski cold-blooded horses, using pedigree information. The reference population contained 2359 horses: 1129 Sztumski and 1230 Sokólski included in conservation programs in 2014. The data set consisted of a total of 12,821 ancestor pedigrees. The results showed that in the analyzed population the number of founders was 1139 for Sztumski and 1118 for Sokólski horses; effective population size and effective number of founders were 688.8; 156.9 and 704.5; 111.4, respectively. The mean coefficient of inbreeding was 1.54 for Sztumski and 1.56 for Sokólski horses. In the gene pool the most important contribution was of Ardennes horses (43.67% in Sztumski and 46.82% in Sokólski horses), followed by Belgian horses (18.32% and 9.3%, respectively). The most important ancestors in both populations were Ardennes sires Roll-tan 699 and Gustaw 2807, and German cold-blooded sires Elbgang 1504 and Bär.

scholarly journals On some possibilities and prospects of gene conservation and utilisation of pig breeds

1999 ◽  
Vol 42 (1) ◽  
pp. 57-66
Author(s):  
M. Wittmann ◽  
J. Dohy
Keyword(s):  
Marker Genes ◽  
Small Populations ◽  
Gene Conservation ◽  
Effective Population ◽  
Pig Breeds ◽  
The World ◽  
Inbreeding Rate ◽  
Closed Populations ◽  
Small Effective Population Size

Abstract. Nowadays, there are 47 rare pig breeds in the world the majority of which in Europe. Disappeared breeds are considered to be 139 breeds (mostly in Europe). The prevention of further losses of needs needs special measurements and methods for maintenance and conservation of genetic values. In spite of a lot of means being available, the conservation programs use the possibilities only moderately. Besides the commonly used testing results, special genetic analysis should be practised and extended widely, including blood groups, enzyme and other protein polymorphisms and the new results of genom analysis (marker genes atc). A proper – and well identified - genetic make up is of minimal precondition for preparing effective mating plans to avoid and reduce Inbreeding rate in closed populations. Besides number of traits and markers, more emphasis should be given to the distribution of the genetic markers on each chromosomes detected. If a chromosome were controlled (detected by at least 5 loci, thre would be round 200 parameters necessary as a minimum for a porper control fo the genomic background of a breed. Whilst it is very diffucult to prevent gene losses in small populations (small effective population size) for long term, reconstruction of them should be comined with cryopreservational and up-to-date DNA-screening.

scholarly journals Study of a Turkey Population for Gene Preservation

2004 ◽  
pp. 48-52
Author(s):  
Szilvia Szőke ◽  
István Komlósi ◽  
Edit Korom ◽  
Márton Ispány ◽  
Sándor Mihók
Keyword(s):  
Information Theory ◽  
Genetic Variability ◽  
Genetic Variance ◽  
Rotational Line ◽  
Small Populations ◽  
Gene Conservation ◽  
Selection Methods ◽  
Breeding Method ◽  
Present Generation ◽  
Additional Protection

Genetic variability is very important in small populations. We examined an indigenous bronze turkey population which is bred for gene conservation in order to see if the current mating system maintains genetic variability. The present generation was surveyed using microsatellite markers and a computer model was used to simulate changes in the population over 100 generations.The data was analysed using the concept of entrophy from information theory instead of genetic variance so that we could more accurately measure genetic variability.The results indicate that the breeding method currently in use, rotational line mating, is acceptable with respect to preserving genetic variability, but new selection methods may provide additional protection against the loss of alleles.

scholarly journals Population structure of Brazilian Gyr dairy cattle

2010 ◽  
Vol 39 (12) ◽  
pp. 2640-2645 ◽  
Author(s):  
João Cruz Reis Filho ◽  
Paulo Sávio Lopes ◽  
Rui da Silva Verneque ◽  
Robledo de Almeida Torres ◽  
Roberto Luiz Teodoro ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Structure ◽  
Genetic Variability ◽  
Inbreeding Coefficient ◽  
Mating Strategies ◽  
Future Generations ◽  
Breeding Value ◽  
Effective Number ◽  
Generation Interval ◽  
Inbreeding Coefficients

The objective of the present study was to evaluate the genetic structure of Gyr cattle selected for milk production. Files of pedigree and production were composed of 27,610 animals. The ENDOG program was used for the calculation of individual inbreeding coefficient (F) and coefficient of average relatedness (AR), effective number of animals(Ne), effective number of founders (f e) and ancestors (f a), and generation interval (GI). Individual inbreeding coefficients and average relatedness in the population were 2.82% and 2.10%, respectively. It was observed a reduction in the effective number of animals, especially after publication of the results of the first progeny test. The estimated effective number of founders was 146 and 75 for the ancestrals. Out of those, only 28 ancestors accounted for the origin of 50% of the population genes. The average generation interval was 8.41 years and it was longer for males than for females. For maintaining genetic variability in future generations, it should be invested mating strategies that reduce inbreeding and which do not use massively only some high breeding value sires.

scholarly journals A statistical analysis of population variability in Bronze Turkey considering gene conservation

2004 ◽  
Vol 47 (4) ◽  
pp. 377-385
Author(s):  
S. Szőke ◽  
I. Komlósi ◽  
E. Korom ◽  
M. Ispány ◽  
S. Mihók
Keyword(s):  
Information Theory ◽  
Genetic Variability ◽  
Genetic Variance ◽  
Rotational Line ◽  
Small Populations ◽  
Gene Conservation ◽  
Selection Methods ◽  
Breeding Method ◽  
Present Generation ◽  
Additional Protection

Abstract. Genetic variability is very important in small populations. We examined an indigenous Bronze Turkey population which is bred for gene conservation in order to see if the current mating system maintains genetic variability. The present generation was surveyed using microsatellite markers and a computer model was used to simulate changes in the population over 100 generations. The data was analysed using the concept of entrophy from information theory instead of genetic variance so that we could measure genetic variability more accurately. The results indicate that the breeding method currently in use, rotational line mating, is acceptable with respect to preserving genetic variability, but new selection methods may provide additional protection against the loss of alleles.

scholarly journals Joint genealogical analysis as a tool for diversity evaluation in Pinzgau cattle populations

2014 ◽  
Vol 57 (1) ◽  
pp. 1-12
Author(s):  
Ivan Pavlík ◽  
Johann Sölkner ◽  
Ondrej Kadlečík ◽  
Radovan Kasarda ◽  
Gábor Mészáros ◽  
...  
Keyword(s):  
Reference Population ◽  
Pedigree Analysis ◽  
Inbreeding Coefficient ◽  
Foreign Gene ◽  
Effective Number ◽  
Effective Population ◽  
Identity By Descent ◽  
Dual Purpose ◽  
Gene Origin ◽  
Diversity Evaluation

Abstract. The presented paper gives an overview about genetic diversity in Pinzgau populations in Austria and Slovakia. In total, 12 442 animals were included in the study representing the reference population. All living herdbook cows, dual purpose and beef, from both countries with a maximum foreign gene proportion of 12.5 % were considered. Thus, four subpopulations were analysed. Parameters of diversity based on probability of identity-by-descent and probability of gene origin were computed by the methods of pedigree analysis. The average inbreeding coefficient (five generations taken into account) was 0.0186 (ΔF=0.0041), 0.0242 (ΔF=0.0047), 0.0151 (ΔF=0.0026), and 0.0126 (ΔF=0.0006) in the Austrian dairy (AD), the Austrian beef (AB), the Slovak dairy (SD) and the Slovak beef (SB) subpopulation, respectively. Effective population size ranged from 122.5 (AD) to 809.4 (SB). Effective number of founders was 67.3 and 106.6 in AD and SD and 73 and 212.3 in the AB and SB subpopulations. Effective number of ancestors was 29.59; 34.42; 42.36 and 73.81 in AD, AB, SD and SB, respectively. Effective number of founder genomes was 15.32; 18.15; 23.41 and 41 in AD, AB, SD and SB subpopulations, respectively. Similarities between subpopulations were calculated based on a cosine approach. The highest similarity was found between AD and AB (cosine value 0.9954). SD and AD subpopulations were very similar (cosine value 0.9181).

scholarly journals Pedigree analysis in White Shorthaired goat: First results

2013 ◽  
Vol 56 (1) ◽  
pp. 547-554
Author(s):  
M. Oravcová
Keyword(s):  
Genetic Variability ◽  
Information Needs ◽  
Reference Population ◽  
Pedigree Analysis ◽  
Pedigree Information ◽  
Effective Population ◽  
Mean Values ◽  
First Results ◽  
Marginal Contributions ◽  
The Individual

Abstract. Pedigree records of 1 682 animals of the White Shorthaired goat in Slovakia were investigated. The reference population was defined as the animals born from 2008 to 2011 with at least one ancestor known in the second ancestral generation (670 animals kept in eight flocks). The numbers of founders (286), ancestors (256), effective founders (73), effective ancestors (45) and founder genome equivalents (32) were assessed. Fifteen ancestors were needed to explain 50 % of genetic variability. Marginal contributions of the ten most influential ancestors varied between 5.45 % and 2.47 % and accounted for 39.8 % of genetic variability. The mean values of inbreeding and co-ancestry were 0.69 % and 1.55 %, respectively. The effective population size was assessed to consist of 182 and 142 individuals, depending whether it was calculated from the individual increase in inbreeding or the individual increase in co-ancestry. The number of maximum generations traced, fully traced generations and equivalent complete generations traced were 5.62, 1.97 and 3.04, respectively. The first, second and third ancestral generation were 100 %, 83 % and 71 % complete, respectively. The completeness decreased to as low as 35 % and 11 % in the fourth and fifth generation. To be able to keep genetic links across generations in touch, the amount of pedigree information needs to be increased. This is a serious requirement for appropriate monitoring and management of genetic relations within the population.

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