SUMMARY
Received: 2016-02-23 | Accepted: 2016-04-21 | Available online: 2016-05-30dx.doi.org/10.15414/afz.2016.19.02.59-63The aim of the paper was to evaluate trends in inbreeding and loss of genetic diversity in four beef cattle breeds (Blonde d´Aquitaine-BA, Charolais-CH, Limousine-LI, Simmental-SM). The highest ratio of inbred animals was found in the SM breed (63.6 %) and the lowest in the LI (14.1 %). The highest average inbreeding intensity we found in the SM, the lowest in the BA. The amount of genetic diversity in the reference population accounting for diversity loss due to genetic drift and unequal founder contributions was the highest in the SM (6.2 %), following the BA (3.5 %), LI (1.1 %) and CH (0.9 %). The proportion of genetic diversity lost due to genetic drift was higher in BA, CH, LI than the loss of genetic diversity due to unequal founder contribution.Keywords: beef cattle, pedigree analysis, inbreeding, genetic diversityReferences Boichard, D., Maignel,L. and Verrier. E. (1997) The value of using probabilities of gene origin to measure genetic variability in a population. Genet. Sel. Evol., vol.29, no. 5, pp.5-23. doi:http://dx.doi.org/10.1186/1297-9686-29-1-5Cabalero, A. and Toro, M.A. (2000) Interrelations between effective population size and other tools for management of conserved populations. Genet. Res., vol. 75, no. 3, pp.331-343. doi:http://dx.doi.org/10.1017/S0016672399004449Gutiérrez, J.P. and Goyache, F. ( 2005) Note on ENDOG: a computer program for analysis pedigree information. J. Anim.Breed. Genet., vol.122. pp.172-176.Gutiérrez, J.P., Goyache, F. and Cervantes, F. ( 2009) Endog v 4.6. A computer program for monitoring genetic variability of populations using pedigree information. User guide. Madrid: Universidad Complutense de Madrid. 45 p..Kadlecík, O. and Pavlík,I. (2012) Genealogical analysis in small populations: The case of four Slovak beef cattle breeds. Slovak J. Anim. Sci., vol. 45, no. 4. pp. 111-117.Kasarda. R. and Kadlecík. O. (2007) An economic impact of inbreeding in the purebred population of Pinzgau cattle in Slovakia on milk production traits. Czech J. Anim. Sci., vol. 52, no. 1, pp. 7-11.Krupa, E., Žáková, E. and Krupová, Z. (2015) Evaluation of inbreeding and genetic variability of five pig breeds in Czech Republic. Asian Australas. J.Anim. Sci.. vol. 28, no. 1, pp. 25-36. doi: http://dx.doi.org/10.5713/ajas.14.0251Lacy, R.C. (1989) Analysis of founder representation in pedigree: Founder equivalents and founder genome equivalents. Zool.Biol., vol. 8, no. 2, pp. 111-123. doi:http://dx.doi.org/10.1002/zoo.1430080203Lacy, R.C. (1995) Classification of genetic terms and their use in the management of captive populations. Zoo. Biol., vol. 14, no. 6, pp. 565-577. doi:http://dx.doi.org/10.1002/zoo.1430140609Melka, M.G. et al. (2013) Analyses of genetic diversity in five Canadian dairy breeds using pedigree data. J. Anim. Breed. Genet., vol. 130, pp. 476–486. doi:http://dx.doi.org/10.1111/jbg.12050McParland, S. et al. (2007) Inbreeding trends and pedigree analysis of Irish dairy and beef cattle populations. Journal of Animal Science, vol. 85, no. 2, pp.322-331. doi:http://dx.doi.org/10.2527/jas.2006-367Maignel, L., Boichard, D. and Verrier.E. (1996) Genetic variability of French dairy breeds estimated from pedigree information. Interbul Bulletin, vol. 14, pp.49-54.Meuwissen, T.H.E. and Luo,Z. (1992) Computing in breeding coefficients in large populations. Genet. Sel. Evol., vol. 24. pp. 305-313. doi:http://dx.doi.org/10.1186/1297-9686-24-4-305Pavlík.I, et al. (2014) Pedigree analysis of Thoroughbred horses in Slovakia. Acta fytotechnica et zootechnica, vol. 17, no. 4, pp. 122-126. doi:http://dx.doi.org/10.15414/afz.2014.17.04.122-126Stachowic, K. et al. (2011) Schenkel Rates of inbreeding and genetic diversity in Canadian Holstein and Jersey cattle. J. Dairy Sci., vol. 94, no. 10, pp. 5160–5175. doi: http://dx.doi.org/10.3168/jds.2010-3308ŠIDLOVÁ, V. et al. (2015) Genomic variability among cattle populations based on runs of homozygosity. Poljoprivreda, vol. 21. no. 1 (Supplement), pp. 44-47.Tang, G. Q. et al. (2013) Inbreeding and genetic Ddversity in three imported swine breeds in China using pedigree data Asian Australas. J. Anim.Sci., vol.26, no. 6, pp.755-765. doi:http://dx.doi.org/10.5713/ajas.2012.12645Trakovická, A. et al.(2015) Impact of SNPs in candidate genes on economically important traits in Pinzgau cattle. Poljoprivreda. vol. 21, no. 1(Supplement), pp. 150-154. doi:http://dx.doi.org/10.18047/poljo.21.1.sup.35