scholarly journals Comparison of four mating systems for maintenance of honeybee colonies in terms of the inbreeding coefficient and effective population size

2018 ◽  
Vol 46 (1) ◽  
pp. 3-10
Author(s):  
Tetsuro NOMURA ◽  
Jun-ichi TAKAHASHI
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Mating Systems ◽  
Inbreeding Coefficient ◽  
Effective Population

scholarly journals Population structure of Czech cold-blooded breeds of horses

2011 ◽  
Vol 54 (1) ◽  
pp. 1-9
Author(s):  
L. Vostrý ◽  
Z. Čapková ◽  
J. Přibyl ◽  
B. Hofmanová ◽  
H. Vostrá Vydrová ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Variability ◽  
Population Size ◽  
Effective Population Size ◽  
Inbreeding Coefficient ◽  
Effective Population ◽  
The Czech Republic ◽  
Generation Interval ◽  
Average Value ◽  
Inbreeding Coefficients

Abstract. In order to estimate effective population size, generation interval and the development of inbreeding coefficients (Fx) in three original breeds of cold-blooded horses kept in the Czech Republic: Silesian Noriker (SN), Noriker (N) and Czech-Moravian Belgian horse (CMB) all animals of the particular breeds born from 1990 to 2007 were analysed. The average values of generation interval between parents and their offspring were: 8.53 in SN, 8.88 in N and 8.56 in CMB. Average values of effective population size were estimated to be: 86.3 in SN, 162.3 in N and 104.4 in CMB. The average values of inbreeding coefficient were 3.13 % in SN stallions and 3.39 % in SN mares, in the N breed 1.76 % and 1.26 % and in the CMB breed 3.84 % and 3.26 % respectively. Overall averages of Fx were: 3.23 %, 1.51 % and 3.55 % for the breeds SN, N and CMB. The average value of inbreeding coefficient Fx increased by 1.22 % in SN, by 0.35 % in N and by 1.01 % in CMB, respectively. This may lead to a reduction in genetic variability. Reduction in genetic variability could be either controlled in cooperation with corresponding populations of cold-blooded breeds in other European countries or controlled by number of sires used in population

scholarly journals IDENTITY COEFFICIENTS IN FINITE POPULATIONS. I. EVOLUTION OF IDENTITY COEFFICIENTS IN A RANDOM MATING DIPLOID DIOECIOUS POPULATION

Genetics ◽  
1977 ◽  
Vol 86 (3) ◽  
pp. 697-713
Author(s):  
C Chevalet ◽  
M Gillois ◽  
R F Nassar
Keyword(s):  
Genetic Variability ◽  
Population Size ◽  
Effective Population Size ◽  
Random Mating ◽  
Matrix Multiplication ◽  
Inbred Lines ◽  
Inbreeding Coefficient ◽  
Effective Population ◽  
The Mean ◽  
Over Time

ABSTRACT Properties of identity relation between genes are discussed, and a derivation of recurrent equations of identity coefficients in a random mating, diploid dioecious population is presented. Computations are run by repeated matrix multiplication. Results show that for effective population size (Ne) larger than 16 and no mutation, a given identity coefficient at any time t can be expressed approximately as a function of (1—f), (1—f)3 and (1—f)6, where f is the mean inbreeding coefficient at time t. Tables are presented, for small Ne values and extreme sex ratios, showing the pattern of change in the identity coefficients over time. The pattern of evolution of identity coefficients is also presented and discussed with respect to N eu, where u is the mutation rate. Applications of these results to the evolution of genetic variability within and between inbred lines are discussed.

scholarly journals Inbreeding and relationship coefficients in the Finnish blue fox population

2008 ◽  
Vol 16 (2) ◽  
pp. 147 ◽  
Author(s):  
I. STRANDÉN ◽  
J. PEURA
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Inbreeding Coefficient ◽  
Effective Population ◽  
Breeding Scheme ◽  
Genetic Level ◽  
Blue Fox ◽  
Efficient Breeding ◽  
Breeding Farms ◽  
Animal Size

Animal size has increased considerably in the Finnish blue fox population. This has been achieved by intensive selection. An efficient breeding scheme may increase inbreeding. The rate of inbreeding by generation was estimated to be from 0.107% to 0.191% depending on the considered years. Annual rate of inbreeding was estimated to be from 0.059% to 0.100% depending on the considered years. Effective population size was estimated to be at least 260. Thus, inbreeding seems not a major problem in the Finnish blue fox population. However, some of the best breeding farms in terms of estimated genetic level in animal size have the highest average inbreeding coefficient, as well. Advanced tools to restrict increase in coefficient of inbreeding may be needed in the future, and in some farms already.;

scholarly journals The genetic structure of populations of orchids and its evolutionary importance: understanding processes from patterns

Lankesteriana ◽  
2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Raymond L. Tremblay
Keyword(s):  
Gene Flow ◽  
Natural Selection ◽  
Genetic Structure ◽  
Population Size ◽  
Effective Population Size ◽  
Genetic Drift ◽  
Mating Systems ◽  
Mutation Rates ◽  
Effective Population ◽  
Genetic Structure Of Populations

<div class="page" title="Page 1"><div class="layoutArea"><div class="column"><p><span>Evolution through either natural selection or genetic drift is dependent on variation at the genetic and mor- phological levels. Processes that influence the genetic structure of populations include mating systems, effective population size, mutation rates and gene flow among populations. </span></p></div></div></div>

scholarly journals Efek Silang Dalam Terhadap Ukuran Tubuh Kerbau Murrah

2019 ◽  
Vol 6 (3) ◽  
pp. 382
Author(s):  
Muhammad Ary Syaputra ◽  
Sayed Umar ◽  
Asep Gunawan
Keyword(s):  
Body Size ◽  
Population Size ◽  
Effective Population Size ◽  
Body Length ◽  
Inbreeding Coefficient ◽  
The Body ◽  
Chest Circumference ◽  
Effective Population ◽  
Murrah Buffalo ◽  
North Sumatra

ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh silang dalam terhadap  ukuran tubuh kerbau murrah. Penelitian ini dilaksanakan di BPTU-HPT Siborong-borong dan di peternakan masyarakat Kabupaten Deli Serdang yaitu Desa Tanjung Garbus dan Desa Amplas Tambak Rejo. Penelitian ini menggunakan 41 ekor   ternak kerbau murrah terdiri dari 23 ekor  betina dan 18 ekor jantan (umur 1-4 bulan) dan data silsilah ternak kerbau murrah. Variabel yang diamati adalah koefisien silang dalam, ukuran populasi efektif, laju silang dalam, dan pengaruh silang dalam terhadap ukuran tubuh kerbau murrah. Hasil penelitian menunjukkan bahwa nilai koefisien silang dalam di BPTU-HPT Siborong- borong dan Deli serdang  adalah 0,218 dan 0,062. Ukuan populasi efektif kerbau murrah di Sumatera Utara sebesar 61 ekor dengan laju silang dalam per generasi sebesar 0,81%. Disimpulkan bahwa inbreeding yang terjadi di BPTU-HPT Siborong-borong dan Deli Serdang berpengaruh terhadap ukuran tubuh yaitu nilai rataan tinggi pundak, panjang badan, lingkar dada, lebar dada, dalam dada, tinggi pinggul, lebar pinggul, panjang pinggang, dan lebar pinggang.Kata kunci: kerbau murrah, koefisien silang dalam, laju silang dalam, ukuran populasi efektif, ukuran tubuh  ABSTRACTThis study was aimed to identify the effect of inbreeding on the body size of murrah buffalo. The research was done in the BPTU-HPT Siborong-borong and the community farm of Deli Serdang Regency (Tanjung Garbus village and Amplas Tambak Rejo village). The sample of murrah buffalo used 41 heads consist of females and males as many as every 23 and 18 heads (age of 1-4 months) and data of murrah buffalo pedigree. The variables measurement were inbreeding coefficient, effective population size, rate of inbreeding and the affect of inbreeding to body size of murrah buffalo. The results showed that the coeficient of the inbreeding coefficient in the BPTU-HPT Siborong–borong and Deli Serdang were 0.218 and 0.062. The effective population size of murrah buffalo in North Sumatra is 61 heads, with the rate of inbreeding per generation were 0.81 percents. It could be concluded that inbreeding that occurred in BPTU-HPT Siborong-borong and Deli Serdang the value of shoulder height, body length, chest circumference, chest width, chest depth, hip height, hip width, waist length, and waist width.Keywords: body size, effective population size, inbreeding coefficient, murrah buffalo, rate of inbreeding

scholarly journals Analysis of Genetic Diversity in the Czech Spotted Dog

Animals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1416
Author(s):  
Karolína Machová ◽  
Anita Kranjčevičová ◽  
Luboš Vostrý ◽  
Emil Krupa
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Effective Population Size ◽  
Reference Population ◽  
Pedigree Analysis ◽  
Inbreeding Coefficient ◽  
Random Genetic Drift ◽  
Effective Population ◽  
Founding Population ◽  
The Mean

Loss off genetic diversity negatively affects most of the modern dog breeds. However, no breed created strictly for laboratory purposes has been analyzed so far. In this paper, we sought to explore by pedigree analysis exactly such a breed—the Czech Spotted Dog (CSD). The pedigree contained a total of 2010 individuals registered since the second half of the 20th century. Parameters such as the mean average relatedness, coefficient of inbreeding, effective population size, effective number of founders, ancestors and founder genomes and loss of genetic diversity—which was calculated based on the reference population and pedigree completeness—were used to assess genetic variability. Compared to the founding population, the reference population lost 38.2% of its genetic diversity, of which 26% is due to random genetic drift and 12.2% is due to the uneven contribution of the founders. The reference population is highly inbred and related. The average inbreeding coefficient is 36.45%, and the mean average relatedness is 74.83%. The effective population size calculated based on the increase of inbreeding coefficient is 10.28. Thus, the Czech Spotted Dog suffered significant losses of genetic diversity that threaten its future existence.

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