Population study of the Pura Raza Español Horse regarding its coat colour

Poyato‐Bonilla, Julia; Sánchez-Guerrero, María José; Santos, Rute; Valera, M.

doi:10.2478/aoas-2018-0016

Cited by 13 publications

(14 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pedigree completeness level of the PRE horses born in last generational interval (the last 10 years [20], 115,005 individuals) was 99.6%, remaining above 99% until the third generational interval and above 90% until the seventh generational interval. The mean complete generations of the total pedigree (328,706 horses) were 5.6, the mean maximum generations were 17.1 and the mean equivalent generations were 9.4.…”

Section: Resultsmentioning

confidence: 94%

Genetic Structure Analysis of the Pura Raza Español Horse Population through Partial Inbreeding Coefficient Estimation

Perdomo-González

Sánchez-Guerrero

Molina

et al. 2020

Animals

Self Cite

View full text Add to dashboard Cite

The aim of this work was to analyze genetic parameters such as the inbreeding coefficient (F), relatedness coefficient (AR) and partial inbreeding coefficient (Fij) of the whole PRE population, and the ancestors which account for 50% of the total genetic variability of the current population, from genealogical information. The average F of the whole PRE population (328,706 animals) has decreased from 8.45% to 7.51% in the least 20 years. The Fij was estimated for the whole PRE population, resulting in a database of 58,772,533 records containing one record for each Fij that each animal receives from a certain common ancestor (CA). A total of 10,244 CAs contributed to the Fij with an average of 5370 descendants, with each descendant having an average of 170 CAs. Over the generations, the number of CAs has increased, while the proportion of Fij by each one has decreased. In addition, the contributions of the more influential ancestors have changed. The increased census, the limited use of artificial insemination and our increased knowledge about inbreeding depression and the animals’ breeding values allow breeders to select horses more for their functionality and conformation than for their pedigree reputation, which is the cause of all these changes.

show abstract

Section: Resultsmentioning

confidence: 94%

Genetic Structure Analysis of the Pura Raza Español Horse Population through Partial Inbreeding Coefficient Estimation

Perdomo-González

Sánchez-Guerrero

Molina

et al. 2020

Animals

Self Cite

View full text Add to dashboard Cite

show abstract

“…The probability of gene origin and the genetic variability were analysed in the whole population (328,706 animals), in the population of 264,084 active animals (i.e. from the last two generations with a generation interval of 10 years [13]), and in the reference PRE population (5026 animals) in order to shed light on the status of the genetic links between individuals, the level of inbreeding, the kinship between animals and the representativeness of the sample.…”

Section: Statistical and Genetic Variability Analysismentioning

confidence: 99%

“…The equivalent complete generations value is calculated as the sum of the terms across all known ancestors, or the sum of (1/2) n where n is the number of generations separating the individual to each known ancestor [23]. According to the literature [13], the average generation interval in PRE is approximately 10 years, which is the value used throughout this study.…”

Section: Statistical and Genetic Variability Analysismentioning

confidence: 99%

“…Today, this breed is used mainly as a leisure horse and in equestrian sports particularly in dressage. Although the population of PRE horses is large, genealogical analyses have demonstrated that inbreeding levels are significantly high [12,13] because the number of its founders is small, selection for desired traits is carried out in a closed population, and inbred matings are performed on the studs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Genetic inbreeding depression load for morphological traits and defects in the Pura Raza Española horse

et al. 2020

Self Cite

View full text Add to dashboard Cite

Background Inbreeding is caused by mating between related individuals and is associated with reduced fitness and performance (inbreeding depression). Several studies have detected heterogeneity in inbreeding depression among founder individuals. Recently, a procedure was developed to predict hidden inbreeding depression load that is associated with founders using the Mendelian sampling of non-founders. The objectives of this study were to: (1) analyse the population structure and general inbreeding, and (2) test this recent approach for predicting hidden inbreeding depression load for four morphological traits and two morphology defects in the Pura Raza Española (PRE) horse breed. Results The regression coefficients that were calculated between trait performances and inbreeding coefficients demonstrated the existence of inbreeding depression. In total, 58,772,533 partial inbreeding coefficients (Fij) were estimated for the whole PRE population (328,706 horses). We selected the descendants of horses with a Fij ≥ 6.25% that contributed to at least four offspring and for which morphological traits were measured for the subsequent analysis of inbreeding depression load (639 horses). A pedigree was generated with the last five generations (5026 animals) used as the reference population (average inbreeding coefficient of 8.39% and average relatedness coefficient of 10.76%). Heritability estimates ranged from 0.08 (cresty neck) to 0.80 (height at withers), whereas inbreeding depression load ratios ranged from 0.01 (knock knee) to 0.40 (length of shoulder), for an inbreeding coefficient of 10%. Most of the correlations between additive and inbreeding depression load genetic values and correlations between inbreeding depression load genetic values for the different traits were positive or near 0. Conclusions Although the average inbreeding depression loads presented negative values, a certain percentage of the animals showed neutral or even positive values. Thus, high levels of inbreeding do not always lead to a decrease in mean phenotypic value or an increase in morphological defects. Hence, individual inbreeding depression loads could be used as a tool to select the most appropriate breeding animals. The possibility of selecting horses that have a high genetic value and are more resistant to the deleterious effects of inbreeding should help improve selection outcomes.

show abstract

“…This may be because, for a long time, these animals have been chosen as stallions or mares for this coat colour and not for their morphology (even despite knowing they had this defect). In fact, black stallions are chosen as breeding animals at very early ages [ 35 ]. Horses with chestnut coat color were forbidden in the PRE population until 2002, so the selection intensity in this subpopulation was probably lower compared with the other coats [ 8 ].…”

Section: Discussionmentioning

confidence: 99%

Survey of Risk Factors and Genetic Characterization of Ewe Neck in a World Population of Pura Raza Español Horses

Ripollés

Sánchez-Guerrero

Perdomo-González

et al. 2020

Animals

Self Cite

View full text Add to dashboard Cite

Ewe Neck is a relatively common morphological defect in Pura Raza Español (PRE) horses and other Baroque type horse breeds, which adversely affects the breeding industry; (1) objectives: to establish the within-breed prevalence, possible associated factors, and heritability of Ewe Neck in PRE horses; (2) methods: the database included evaluations of 35,267 PRE horses. The Ewe Neck defect, 16 morphological traits, and 4 body indices were recorded. A Bayesian genetic animal model included the following systematic effects: sex, age, coat color, geographical area of the stud, and birth stud size were used; (3) results: in this PRE population, a total of 27.12% was affected. All the risk factors studied were significantly associated with the Ewe Neck score. The heritability coefficient for Ewe Neck score ranged from 0.23 to 0.34. Morphological traits (height at chest, length of back, head-neck junction, and bottom neck-body junction) and the indices (head and thoracic index) were those most closely related with the appearance of Ewe Neck; (4) conclusions: Ewe Neck is a relatively frequent defect in PRE horses, associated with risk factors and other morphological traits, with a moderate level of heritability. Breeding to select against this condition may therefore be beneficial in this breed.

show abstract

Population study of the Pura Raza Español Horse regarding its coat colour

Cited by 13 publications

References 37 publications

Genetic Structure Analysis of the Pura Raza Español Horse Population through Partial Inbreeding Coefficient Estimation

Genetic Structure Analysis of the Pura Raza Español Horse Population through Partial Inbreeding Coefficient Estimation

Genetic inbreeding depression load for morphological traits and defects in the Pura Raza Española horse

Survey of Risk Factors and Genetic Characterization of Ewe Neck in a World Population of Pura Raza Español Horses

Contact Info

Product

Resources

About