Summary Computation of inbreeding rate (Δ F ) must consider that is delayed with one generation respect to the idealized population when addressed using individual coefficients. The expression relating in t = 1 – (1– ΔF should be more correctly written real animal populations as −1 , changes allele frequencies occur equivalent co‐ancestries previous generation. This simple approach tested on simulated and pedigrees thus demonstrating that: (i) adjusted increase becomes stable under random...

Abstract We present here a simple approach to obtain reliable estimates of the effective population size in real world populations via computation increase inbreeding for each individual (delta F i ) given population. The values delta are computed as t -root 1 - (1 where is coefficient and equivalent complete generations individual. pre-defined reference subset can be averaged used estimate size. A standard error this N e further from deviation inbreeding. methodology demonstrated by...

We introduce a simple method to estimate effective population size from increase in coancestry (Δc(jk)) for all pairs of individuals j and k reference subpopulation. An pairwise any pair can be defined assuming that hypothetical mating between them would give an individual with inbreeding coefficient equal c(jk), where c(jk) is the k. The equivalent measure discrete generations value (g(jk)) corresponding jk computed by averaging equivalents its parents (g(j) g(k)). mean subpopulation used...

Summary The objective of this study was to test the performance a recently proposed methodology for estimation realized effective size ( N e ) based on individual increase in inbreeding ΔF i several real pedigrees: (a) an experimental mice population; (b) closed pedigree fighting bulls; (c) Spanish Purebred (SPB, Andalusian) horse pedigree; (d) Carthusian strain SPB (e) Arab and (f) Anglo‐Arab pedigree. Several reference subpopulations were defined basis generation length order consider only...

The aims of this study were, first, to evaluate eye temperature (ET) with infrared thermography and heart rate (HR) measure stress in horses during show jumping competitions their relationship competition results, second, the influence different extrinsic intrinsic factors horse on measurements analysed. One hundred seventy-three Spanish Sport Horses were analysed for ET HR, these taken 3 h before competition, just after it. Two interval also assessed each parameter. Positive significant...

Abstract Inbreeding depression (ID) is usually observed as reduced survival and fertility may have a variable impact in different populations. The aim of this study was to estimate ID from genomic pedigree data the litter size (LS) high variability line (H-Line) low (L-Line). Of these, L-Line performed better on traits related robustness. A total 1587 females 26 selection generations were genotyped with high-density SNP array. LS 732 648 H-Line animals used. following calculated: inbreeding...

Inbreeding can have negative effects, such as increasing the expression of deleterious alleles or reducing fitness. A method based on Hidden Markov Models (HMM) was developed to determine probability an individual genome in a homozygous-by-descent state (HBD). As result experiment divergent selection for birth weight environmental variability two lines were created: high line (H-Line) and low (L-Line). The L-Line demonstrated better performance traits related with robustness than H-Line....

The aim of this paper was to estimate the genetic relationships among calving ease (CE), calf survival (CS), and gestation length (GL) assess possibility including information in beef cattle breeding programs. A total 35,395 field records were available for CE, 30,684 GL, 36,132 CS from Asturiana de los Valles breed. 3 traits analyzed as fitting a multivariate linear mixed model. Estimates heritability (±SE) direct effects (CEd, GLd, CSd) 0.325 ± 0.022, 0.331 0.026, 0.226 0.018,...

Making a morphological pre-selection of Pura Raza Español horses (PRE) for dressage is challenging task within its current breeding program. The aim our research was to design an early genetic selection linear traits index improve performance, using 26 and six (walk, trot, canter, submission, general impression - partial scores total score) as criteria. data set included 10 127 PRE (4159 males 5968 females) collected between 2008 2013 (one record per horse) 19 095 1545 (1476 69 females; 12.4...

Data from seven generations of a divergent selection experiment designed for environmental variability birth weight were analysed to estimate genetic parameters and explore signs response. A total 10 783 records 638 females 1127 litters in combination with 007 pedigree used. Each record was assigned the mother pup heteroscedastic model, after selection, evidence success process shown. Bayesian analysis showed that started first generation second its variability. Genetic estimated across...

Reproductive traits have a major influence on the economic effectiveness of horse breeding. However, there is little information available. We evaluated use reproductive as selection criteria in official breeding programs to increase efficiency studs, analysing 696 690 records from pedigree data eight Spanish populations, with different purposes. The parameters studied both sexes were age at first foaling (AFF), last foaling, average life and generational interval. In females, interval...

This research assesses the genetic composition of three Arab-derived Spanish horse breeds as an example to highlight major shortcomings related genealogical analyses in open populations and propose approaches useful deal with this task. The studbooks Arab (SA)-derived breeds, Anglo-Arab (dAA), Hispano-Arab (dHA) Sport Horse (dSSH) those their parental SA, Purebred (SPB) Thoroughbred (TB), totalling 211 754 individuals, were available. genealogies dAA, dHA dSSH analysed not only using...

Summary The most popular use of the Pura Raza Español horse in sport is for dressage competitions. Tests on young horses were first established 2004 Spain to collect data genetic evaluation this breed's suitability dressage. aim study was compare eight different models find out appropriate way include rider A progressive removal systematic effects from model also analysed. total 8867 performance records collected between and 2011 1234 aged 4 6 years old used. final score test used as trait....

The alpaca fiber diameter (FD) varies from 18 to 36 μm, being the finer categories highly appreciated. However, presents some limitations in textile industry due high incidence of medullation and variability, both reduces comfort feeling garments. Decreasing or even removing could be a possible selection objective breeding programs for increasing economic value fiber. Therefore, present work aimed estimate genetic parameters regarding traits, as well correlations with other economical...

The objective of this work was to study the changes that, selecting for environmental variability birth weight (BW), could bring other interesting traits in livestock such as: survivability at weaning (SW), litter size (LS) and (WW), their assessed from standard deviations LS, deviation WW (SDWW) also total (TLBW) weaning. Data were registered after eight generations a divergent selection experiment BW mice. Genetic parameters phenotypic genetic evolution using linear homoscedastic...

Rare breeds represent a valuable resource for future market demands. These populations are usually well-adapted, but their low census compromises the genetic diversity and of these breeds. Since improvement breed commercial traits may also confer higher probabilities survival breed, it is important to achieve good responses artificial selection. Therefore, efficient management essential ensure that they respond adequately selection in possible scenarios. Scenarios maximize maximum variance...

Breeding programs have an essential role in the recovery of threatened populations through optimal genetic management and mating strategies. The dama gazelle (

Demographic history, current status, and efficiency of the mating strategy were analyzed using pedigree Pannon White (PW) rabbits born between 1992 2007. Potential accumulation detrimental effects loss genetic diversity also considered. Calculations estimates done most often for in 2007, whereas other reference populations (REFPOPXXXX) specified explicitly. The contained 4,749 individuals 580 founders, its completeness was 82.1% up to 10 94.5% 5 generations, respectively. Generation...