Journal of Food, Agriculture and Environment

Vol 9, Issue 2,2011
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Inbreeding coefficient and its effect on performance of cocoon traits in four Iranian commercial silkworm lines


S. Azizian 1, S. Z. Mirhoseini 1, A. A. Shadparvar 1, M. Ghanipoor 2, A. R. Seidavi 3*

Recieved Date: 2010-11-26, Accepted Date: 2011-03-20


Increase of inbreeding could cause reduction in performance of some economical traits of animal populations. Thereby in line breeding there is an attempt for prevention of more inbreeding in populations. The level of inbreeding and its relationship to the economical traits (cocoon weight, cocoon shell weight and cocoon shell percentage) of 4 lines of Iranian silkworm populations including 107 and 153 with Japanese origin and 110 and 154 with Chinese origin using 3 regression models were estimated. In the first model linear effect of inbreeding, in the second model linear and quadratic effect of inbreeding and in the third model linear, quadratic and cubic effect of inbreeding on the traits were investigated with presence of line, family and gender effects. Pedigree information of 40,717 silkworm which had been collected during 9 generations between 2001-2006 from Iran Silkworm Research Center were studied. The average of inbreeding coefficient of total population was 9.626%. Except for line 153 in the second model and line 107 in the third model, inbreeding had positive effect on cocoon shell percentage. Model 1 with linear inbreeding effect had more significancy (p<0.0001) and less complexity for study of inbreeding effect on cocoon shell percentage. On the basis of model 1, in all studied lines, except for line 154, inbreeding effect on cocoon weight and cocoon shell weight was not significant. On the basis of model 3, in line 110, inbreeding had negative effect on cocoon weight and cocoon shell weight. This research also showed that the estimates of inbreeding effect on studied traits intensively was affected by the type of statistical model.


Cocoon, shell, weight, inbreeding, gene, breeding

Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 2
Category: Agriculture
Pages: 203-206

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