Journal of Food, Agriculture and Environment

Genetic trend, phenotype trend, correlation, heritability, and breeding values of three oval cocoon silkworm pure lines under selection pressure using WOMBAT software

Author(s):

A. Shabdini ¹, A. R. Seidavi ^2*, S. Gharahveysi ¹, S. Z. Mirhosseini ³

Recieved Date: 2010-11-08, Accepted Date: 2011-01-03

Abstract:

In this research genetic parameters and genetic trend of three commercial lines 32, 104 and 110 were assessed with utilizing 11,250 records obtained from Iran Silkworm Research Center. Lines in the first generation were under phenotypic selection and then no selection was done in three next generations and the mating was random. Covariance matrix components and genetic parameters were estimated with three-traits and single-trait model analyzing by using REML and AIREML algorithm of WOMBAT software. The heritability of cocoon weight (CW) in lines 32, 104 and 110 in single-traits was 0.406±0.082, 0.515±0.091 and 0.211±0.068, respectively, and in cocoon shell weight (CSW) 0.383±0.081, 0.416±0.86 and 0.176±0.063, respectively. Genetic and environment correlation between CW and CSW in line 32 was estimated at 0.919 and 0.537, in line 104 at 0.861 and 0.655, respectively, and in line 110 at 0.849 and 0.662. Genetic trend of CW using breeding value in lines 32, 110 and 104 was estimated at 0.003, 0.0045 and 0.002 g, for CSW at 0.0001, 0.0022 and 0.001 g, respectively, and for CSP at -0.03, 0.065 and 0.35%. High and positive genetic correlation between two economic traits, CW and CSW, represents that selection for CW will increase CSW. According to results, CW and CSW traits had high heritability. Genetic advance of traits follows their heritability, that results confirmed it. In all standard lines and traits the values of genetic trend were higher than those of phenotypic trend and also the values were positive and significant except line 110, while the phenotypic trend of traits mostly was negative which represents environmental effects on traits.

Keywords:

Silkworm, heritability, genetic trend, breeding value, correlation

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 1
Category: Environment
Pages: 609-617

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