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ASSOCIATIONS OF POLYMORPHISMS IN PROLACTIN AND DOPAMINE RECEPTOR D2 GENES WITH REPRODUCTIVE TRAITS ON SILKIE CHICKEN

(2023) ASSOCIATIONS OF POLYMORPHISMS IN PROLACTIN AND DOPAMINE RECEPTOR D2 GENES WITH REPRODUCTIVE TRAITS ON SILKIE CHICKEN. Online Journal of Animal and Feed Research. pp. 321-327. ISSN 2228-7701

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Abstract

The Silkie chicken (Gallus gallus domesticus Brisson) is one of domestic chicken breeds with commercial rearing and breeding potentials for egg production. Prolactin (PRL) and dopamine D2 receptor (DRD2) are potential genes associated with reproductive traits in chickens. This study was conducted to analyze the association of PRL and DRD2 insertion/deletion (Indel) polymorphisms with chicken reproductive traits in Silkie chickens. A total of 380 hens from 16�40 weeks of age were used, with each one being placed in a separate cage. DNA isolation was performed using feather samples, and genotypes were detected using the Indel technique. Two polymorphisms consisting of 24 base pair (bp) Indel in the promoter region of the PRL gene and 22 bp Indel in the promoter region of the DRD2 gene were identified. At both sites, the Indel polymorphisms did not follow the Hardy-Weinberg equilibrium. In addition, with the exception of total eggs over 23 weeks of laying in the PRL gene, the analysis revealed no association between these polymorphic loci and any traits collected. In conclusion, birds with the DD genotype produced the maximum egg yield (73.6 eggs/hen), whereas those with the II genotype produced approximately 9 fewer eggs (64.1 eggs/hen), resulting in laying rates of 45.7 and 40.1, respectively. For enhancing the egg-laying capacity of Silkie chickens via selective breeding, opting for DD birds with DD genotype of PRL Indel is highly recommended. © 2023, Scienceline Publication. All rights reserved.

Item Type: Article
Keywords: Egg production; Indel technique; Polymorphism; Reproductive traits; Silkie chicken
Subjects: S Agriculture > SF Animal culture
Divisions: Online Journal of Animal and Feed Research (OJAFR)
Page Range: pp. 321-327
Journal or Publication Title: Online Journal of Animal and Feed Research
Journal Index: Scopus
Volume: 13
Number: 5
Publisher: Scienceline Publication, Ltd
Identification Number: https://doi.org/10.51227/ojafr.2023.47
ISSN: 2228-7701
Depositing User: Dr. Saeid Chekani-Azar
URI: http://eprints.science-line.com/id/eprint/895

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