نتایج جستجو برای: inbreeding coefficient

تعداد نتایج: 174104  

Journal: :Journal of dairy science 2007
O González-Recio E López de Maturana J P Gutiérrez

Inbreeding depression on female fertility and calving ease in Spanish dairy cattle was studied by the traditional inbreeding coefficient (F) and an alternative measurement indicating the inbreeding rate (DeltaF) for each animal. Data included records from 49,497 and 62,134 cows for fertility and calving ease, respectively. Both inbreeding measurements were included separately in the routine gen...

2015
Jane M Reid Peter Arcese Lukas F Keller Ryan R Germain A Bradley Duthie Sylvain Losdat Matthew E Wolak Pirmin Nietlisbach

Extra-pair reproduction is widely hypothesized to allow females to avoid inbreeding with related socially paired males. Consequently, numerous field studies have tested the key predictions that extra-pair offspring are less inbred than females' alternative within-pair offspring, and that the probability of extra-pair reproduction increases with a female's relatedness to her socially paired male...

1999
Philip W. Hedrick

During the past two decades, pedigree analysis has documented inbreeding depression in many captive populations. This and subsequent research has led to a recognition that inbreeding depression is a potentially important determinate of small population fitness, in both captivity and the wild. Modern captive-breeding programmes now universally avoid inbreeding. We use simulation to investigate h...

Journal: :Genetics 1982
M Curie-Cohen

The average inbreeding coefficient f of a population can be estimated in several different ways based solely on the genotypic frequencies at a single locus. The means and variances of four different estimates have been compared. While the four estimates are equivalent when there are two alleles, the best estimates when there are three or more alleles are based upon total heterozygosity (Formula...

Journal: :iranian journal of applied animal science 2015
s. jafari

a pedigree file consisting of 5860 individuals, 167 sires and 1582 dams collected at makooei sheep breeding station (msbs) during a period of 24 years (1990 to 2013) was used to calculate the inbreeding coefficients to reveal any probable effects of inbreeding (f) on the studied traits. the studied traits were classified to the five main groups including body weight, kleiber ratio, body measure...

Journal: :Genetics and molecular research : GMR 2007
L D Van Vleck

We describe a simple method to compute the numerator relationship between any or all pairs of animals in the numerator relationship matrix. The method depends on output of the MTDFNRM program from the MTDFREML set of programs. An option of the MTDFNRM program creates a file that includes the inbreeding coefficient for each animal. The method also makes use of how the inbreeding coefficient is t...

Journal: :Collegium antropologicum 2004
Igor Rudan Tatjana Skarić-Jurić Nina Smolej-Narancić Branka Janićijević Diana Rudan Irena Martinović Klarić Lovorka Barać Marijana Pericić Radoslav Galić Margaret Lethbridge-Cejku Pavao Rudan

The aim of this study was to investigate a recessive genetic component in susceptibility to osteoporosis (OP) by comparing its prevalence in isolated villages of three Croatian islands: Brac, Hvar and Korcula with different levels of inbreeding. A random sample of 20-30% adults from 14 villages was obtained, including a total of 1,389 examinees. The average inbreeding coefficient (F) of examine...

Journal: :Journal of animal science 2012
M L Santana P S Oliveira J P Eler J P Gutiérrez J B S Ferraz

The study of population structure by pedigree analysis is useful to identify important circumstances that affect the genetic history of populations. The intensive use of a small number of superior individuals may reduce the genetic diversity of populations. This situation is very common for the beef cattle breeds. Therefore, the objectives of the present study were to analyze the pedigree and p...

Journal: :Anais da Academia Brasileira de Ciencias 2015
Leonardo S da Costa Nathana S Corneleo Valdir M Stefenon

Efficient designs are crucial for population genetic studies on forest species. In this study we employed individual based simulations aiming to evaluate what fraction of a population should be sampled to obtain confident estimations of allelic richness and of inbreeding coefficient in population genetic surveys. The simulations suggest that at least 10% of the total population has to be sample...

2007
L. D. Van Vleck Roman L. Hruska

We describe a simple method to compute the numerator relationship between any or all pairs of animals in the numerator relationship matrix. The method depends on output of the MTDFNRM program from the MTDFREML set of programs. An option of the MTDFNRM program creates a file that includes the inbreeding coefficient for each animal. The method also makes use of how the inbreeding coefficient is t...

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