Advanced SearchSearch Tips
Complex Segregation Analysis of Total Milk Yield in Churra Dairy Ewes
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Complex Segregation Analysis of Total Milk Yield in Churra Dairy Ewes
Ilahi, Houcine; Othmane, M. Houcine;
  PDF(new window)
The mode of inheritance of total milk yield and its genetic parameters were investigated in Churra dairy sheep through segregation analyses using a Monte Carlo Markov Chains (MCMC) method. Data which consisted of 7,126 lactations belonging to 5,154 ewes were collected between 1999 and 2002 from 15 Spanish Churra dairy flocks. A postulated major gene was assumed to be additive and priors used for variance components were uniform. Based on 50 000 Gibbs samples from ten replicates chains of 100,000 cycles, the estimated marginal posterior meansposterior standard deviations of variance components of milk yield were , , and for major gene variance (), polygenic variance (), permanent environmental variance () and error variance (), respectively. The results of this study showed the postulated major locus was not significant, and the 95% highest posterior density regions () of most major gene parameters included 0, and particularly for the major gene variance. The estimated transmission probabilities for the 95% highest posterior density regions () were overlapped. These results indicated that segregation of a major gene was unlikely and that the mode of inheritance of total milk yield in Churra dairy sheep is purely polygenic. Based on 50,000 Gibbs samples from ten replicates chains of 100,000 cycles, the estimated polygenic heritability and repeatability were and r=, respectively.
Segregation Analysis;Bayesian Method;Major Gene;Genetic Parameters;Milk Yield;Dairy Sheep;
 Cited by
Evidence of major gene(s) affecting milk traits in the Chios sheep breed, Small Ruminant Research, 2012, 105, 1-3, 61  crossref(new windwow)
Afolayan, R. A., M. N. Fogarty, J. E. Morgan, G. M. Gaunt, L. J. Cummins, A. R. Gilmour and S. Nielsen. 2008. Genetic analysis of milk production and composition in crossbred ewes from different maternal genotypes. Anim. Prod. Sci. 49:24-31.

Box, G. E. P. and G. Tiao. 1973. Bayesian Inference in Statistical Analysis, Reading Addison-Wesley.

Elston, R. C. 1980. Segregation analysis. Current developpements in anthropological genetics, vol. 1. Edited by Mielke J. H and Crawford M. H Plenum Publishing Corporation. 327-354.

Elston, R. C. and J. M. Stewart. 1971. A general model for the genetic analysis of pedigree data. Hum. Hered. 21:523-542. crossref(new window)

El-Saied, U. M., J. A. Carriedo and L. F. de la Fuente. 1999. Genetic parameters of lactation cell counts and milk and protein yields in dairy ewes. J. Dairy Sci. 82:639-644. crossref(new window)

El-Saied, U. M., L. F. de la Fuente, J. A. Carriedo and F. S. San Primitivo. 2005. Genetic and phenotypic parameter estimates of total and partial lifetime traits for dairy ewes. J. Dairy Sci. 88:3265-3272. crossref(new window)

Guo, S. W. and E. A. Thompson. 1992. Monte Carlo method for combined segregation and linkage analysis. Am. J. Hum. Genet. 51:1111-1126.

Gutierrez, J. P., E. Legazb and F. Goyache. 2007. Genetic parameters affecting 180-days standardised milk yield, test-day milk yield and lactation length in Spanish Assaf (Assaf.E) dairy sheep. Small Rumin. Res.70:233-238. crossref(new window)

Gootwine, E. and G. E. Pollott. 2000. Factors affecting milk production in improved Awassi dairy ewes. Anim. Sci. 24:77-83.

Hagger, C., L. L. G. Janss, H. K. Kadarmideen and G. Strazinger. 2004. Bayesian inference on major loci in related multigeneration selection lines of laying hens. Poult. Sci. 83:1932-1939. crossref(new window)

Ilahi, H. 1999. Variabilite genetique de debit de traite chez les caprins laitiers. These de doctorat. ENSA- Rennes, France.

Ilahi, H., E. Manfredi, P. Chastin, F. Monod, J. M. Elsen and P. Le Roy. 2000. Genetic variability in milking speed of dairy goats. Genet. Res. 75:315-319. crossref(new window)

Ilahi, H. and H. N. Kadarmideen. 2004. Bayesian segregation analysis of milk flow in Swiss dairy cattle using Gibbs sampling. Genet. Sel. Evol. 36:563-576. crossref(new window)

Janss, L. L. G., R. Thompson and J. A. M. Van Arendonk. 1995. Application of Gibbs sampling for inference in a mixed major gene-polygenic inheritance model in animal populations. Theor. Appl. Genet. 91:1137-1147.

Janss, L. L. G., J. A. M. Van Arendonk and E. W. Brascamp. 1997. Bayesian statistical analyses for presence of single major genes affecting meat quality traits in crossed pig population. Genetics 145:395-408.

Janss, L. L. G. 1998. "MAGGIC" a package of subroutines for genetic analyses with Gibbs sampling, in: Proc. 6th World Congr. Genet. Appl. Livest. Prod., 11- 6 January 1998, Vol. 27, University of New England, Armidale, Australia, pp. 459-460.

Janss, L. L. G. 2008. "iBay manual version 1.46". Janss Bioinformatics, Lieden, Netherlands.

Jawasreh, K. I. Z. and A. Z. Khasawneh. 2007. Genetic evaluation of milk production traits in Awassi sheep in Jordan. Egyptian J. Sheep Goat Sci. 2:83-100.

Miyake, T., C. Gaillard, K. Moriya and Y. Sasaki. 1999. Accuracy of detection of major genes segregating in outbred population by Gibbs sampling using phenotypic values of quantitative traits. J. Anim. Breed. Genet. 116:281-288. crossref(new window)

Nikolau, M., A. P. Kominakis, E. Rogdakis and S. Zampitis. 2004. Effect of mean and variance heterogeneity on genetic evaluations of Lesbos dairy sheep. Livest. Prod. Sci. 88:107-115. crossref(new window)

Othmane, M. H, L. F. Fuente, J. A. Carriedo and F. S San Primitivo. 2002a. Heritability and genetic correlations of test day milk yield and composition, individual laboratory cheese yield, and somatic cell count for dairy ewes. J. Dairy Sci. 85:2692-2298. crossref(new window)

Othmane, M. H., J. A. Carriedo, F. S. San Primitivo and L. F. De La Fuente. 2002b. Genetic parameters for lactation traits of milking ewes: protein content and composition, fat, somatic cells and individual laboratory cheese yield. Genet. Sel. Evol. 34:581-596. crossref(new window)

Pan, Y., J. Boettcher and J. Gibson. 2001. Bayesian segregation analyses of somatic cell scores of Ontario Holstein cattle. J. Dairy Sci. 84:2796-2802. crossref(new window)

Pollott, G. E., O. Gursoy and K. Kirk. 1998. The genetics of meat and milk production in Turkish Awassi sheep. Proc 6th World Congress on Genetics Applied to Livestock Production. 12-16,Jan. Armidale, NSW Australia. 24:177-180.

Schrooten, C., H. Bovenhuis, J. A. M. Van Arendonk and P. Bijma. 2005. Genetic progress in multistage dairy cattle breeding schemes using genetic markers. J. Dairy Sci. 88:1569-1578. crossref(new window)

Scott, D. W. 1992. Multivariate density estimation. Wiley and Sons, New York.

Serrano, M., M. D Perez-Guzman, V. Montoso and J. J. Jurado. 2003. Genetic analysis of somatic cell counts and milk traits in Manchega ewes. Mean lactation and test-day approaches. Livest. Prod. Sci. 84:1-10. crossref(new window)

Sorensen, D., S. Anderson, J. Jensen, C. S. Wang and D. Gianola. 1994. Inferences about genetic parameters using the Gibbs sampler, in: Proceedings of the 5th World Congress on Genetics Applied to Livestock Production, Guelph, Canada, Vol. 18:321-328.

Ugarte, E., E. Urarte, F. Arrese, J. Arranz, L. Silio and C. Rodriguez. 1996. Genetic parameters and trends for milk production of Blond-Faced Latxa sheep using Bayesian analysis. J. Dairy Sci. 79:2268-2277. crossref(new window)