+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Using pedigree information to monitor genetic variability of endangered populations: The Xalda sheep breed of Asturias as an example



Using pedigree information to monitor genetic variability of endangered populations: The Xalda sheep breed of Asturias as an example



Journal of Animal Breeding & Genetics 120(2): 95-105



The aim of this work is to highlight the need of monitoring small populations to conserve their genetic variability by using a set of parameters to characterize both the structure of populations and management practices. As a representative example we analyse the pedigree information of the endangered Xalda sheep breed of Asturias. The herdbook of Xalda sheep included a total of 805 animals and 62 herds. The number of founders was 329. Nowadays, there are 562 live animals and 26 active herds. The breed is in risk of losing genetic diversity because of the abusive use of certain individuals as parents. The effective number of founder animals is 81.1. The effective number of founder herds is 9.9. The average value of inbreeding in the whole Xalda population was 1.5%. The average relatedness (AR) coefficient reached 1.8% in the whole pedigree. The genetic representation of the lines of founders is unbalanced. Inbreeding trends and effective size do not provide realistic information concerning the risk of loss of diversity as a result of the shallowness of the genealogical information. We suggest the monitoring of the breed using AR to unbalance the genetic contributions of specific individuals, equalizing the genetic representation of the founders and lines in the population. In addition, AR can suggest the introduction of new, under-represented animals in herds showing high average AR values relative to the population. Our results can be useful to improve the development of conservation initiatives involving open herdbooks to avoid the risk of loss of genetic diversity caused by incorrect management practices.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 011625962

Download citation: RISBibTeXText

DOI: 10.1046/j.1439-0388.2003.00378.x


Related references

Relationship between genealogical and microsatellite information characterizing losses of genetic variability Empirical evidence from the rare Xalda sheep breed. Livestock Science 115(1): 80-88, 2008

Allelic and genotypic frequencies of the PRNP gen in the Xalda sheep breed of Asturias. XI Jornadas sobre Produccion Animal, Zaragoza, Spain, 11-12 Mayo, 2005 Volumenes I and II: 75-77, 2005

Characterization of the preliminary paternal lines of breed Xalda sheep from asturias through polymorphism in Y chromosome. 2007

Pedigree and marker information requirements to monitor genetic variability. Genetics, Selection, Evolution 35(4): 369-383, 2003

Evaluation of Genetic Variability of the Breed Norik of Muran according to Pedigree Information. Czech Journal of Animal Science 63(5): 195-200, 2018

Genetic diversity loss due to selection for scrapie resistance in the rare Spanish Xalda sheep breed. Livestock Science 111(3): 204-212, 2007

A genetic analysis of the Galway sheep breed. 1. Some aspects of population dynamics of the pedigree and non-pedigree Galway sheep breed. Irish Journal of Agricultural Research 14(3): 245-253, 1975

A genetic analysis of the Galway sheep breed. 2. The breed structure of the pedigree and non-pedigree Galway sheep breed. Irish Journal of Agricultural Research 14(3): 255-267, 1975

Evaluation of genetic variability within PrP genotyped sheep of endangered Italian Altamurana breed. Preventive Veterinary Medicine 123: 90-96, 2016

Losses of genetic diversity in the rare Xalda sheep breed due to the implementation of a selective policy including the increase of resistance to scrapie. ITEA 102(2): 139-144, 2006

Population structure and genetic variability of the Segurea sheep breed through pedigree analysis and inbreeding effects on growth traits. Small Ruminant Research 149: 128-133, 2017

Genetic variability of two Swiss sheep breeds derived from pedigree information. Proceedings of the 7th World Congress on Genetics Applied to Livestock Production, Montpellier, France, August, 2002 Session 26: 1-4, 2002

Recovery of native genetic background in admixed populations using haplotypes, phenotypes, and pedigree information--using Cika cattle as a case breed. Plos One 10(4): E0123253, 2016

Genetic variability in Colombian Creole cattle populations estimated by pedigree information. Journal of Animal Science 86(3): 545-552, 2008

Genetic variability in Colombian Creole cattle populations estimated by pedigree information. Journal of Animal Science 86(3): 545-552, 2007