Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X

Designing of optimum selection index for Afshari sheep breeding under rural production system

Document Type : Research Paper

Authors

Mokhtar Ali Abbasi 1
Sima Savar Sofla 2

1 Associated Professor, Department of Animal Breeding and Genetic, Animal Science Research Institute, Karaj, Iran

2 Assistant Professor, Department of Animal Breeding and Genetic, Animal Science Research Institute, Karaj, Iran

https://doi.org/10.22059/jap.2015.54014
Abstract
This study was evaluated some strategies and determined the suitable selection index for Afshari sheep using simulated data. The relative importance of traits was determined based on the estimated economic values and consequently, the most benefit traits were applied to selection indexes construction. The interest indexes were different combination of traits including ewe body weight (EBW), annual wools weight (AWW) and total weaning weight for each exposed ewe (TWWEE). The index 1 was included all three mentioned traits. The indexes two, three and four were included (AWW, TWWEE), (EBW, TWWEE) and (TWWEE), respectively. The results indicated that the aggregate genotype, selection index and economic progress increased by increasing in the population size and decreasing in ram ratio, but made reduction in inbreeding average, in all indexes. In more cases, the aggregate genotype decreased by removing a trait in the index. The comparisons among indexes indicated that the most suitable selection index for this breed is index 1 which included EBW, AWW and TWWEE. This index had a maximum selection index average, aggregate genotype and economic progress.

Keywords

aggregate genotype
computer simulation
genetic progress
inbreeding
selection criterion
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Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X
Volume 17, Issue 1 - Serial Number 1
Spring & Summer 2015
Spring 2015
Pages 1-8

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