Quantitative Trait Loci Mapping for Growth Curve Variables in Ghezel Sheep
محورهای موضوعی : Camel
S. Hosseinzadeh
1
(Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran)
A. Azartash
2
(Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran)
S. Nikbin
3
(Department of Animal Science, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran)
A. Javanmard
4
(Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran)
M. Ali Abbasi
5
(Animal Science Research Institute of Iran (ASRI), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran)
S.A. Rafat
6
(Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran)
M. Ghafari
7
(Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, Iran)
N. Hedayat-Evrigh
8
(Department of Animal Science, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran)
S. Alijani
9
(Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran)
کلید واژه: microsatellites, QTL mapping, Ghezel sheep, Half-sib,
چکیده مقاله :
Understanding the genomics aspect of curve variable allows for the combination of genomic regions of such model-based variables from multiple measurements into a few biologically meaningful variables. With this motivation, the aim of the current study was a model-based quantitative trait loci (QTL) detection for growth curve variables in Ghezel fat-tailed sheep. We tested the following items during research: 1) Determining the best nonlinear growth models using six nonlinear equations (Von Bertalanffy, Gompertz, Logistic, Richards, Weibull and Brody) according to 24905 obtained data sets collected from the Ghezel Sheep Breeding Center, Iran, during the 1994-2013 period; 2) Conducted partial genome scan to identify significant QTl controlling best growth model parameters in Ghezel sheep using three half-sib families (Family size=25-50) and 8 microsatellite markers distributed on ovine chromosome 1. In addition, QTL effects for two paternal half-sibs using two models, individual families and across families were calculated. Molecular data were analyzed using SAS and GridQTL programs. Observed results demonstrated the Brody model was the best growth model for growth data according to the lower values of RMSE, AIC and BIC and generally greater values of R2adj than other models. Thus, Brody model parameters (A, B, and C) were subjected to further QTL analysis. Also, our observation identified one significant QTL between the markers INRA11-CSSM004 associated with Brody model A variable (maturity) located in 123 CM in chromosome 1 (P<0.01). Analyses using more families and advance massive genotyping tools will be useful to confirm or to reject these findings.
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