Association of transforming growth factor-ß3 gene polymorphism with growth and body composition traits in Iranian commercial broiler lines
Transforming growth factor-β (TGF-β) polypeptides are members of a large superfamily of growth and differentiation factors that regulate the proliferation and differentiation of a great variety of cell types. The current study was designed to investigate the associations of TGF-β3 gene polymorphism on chicken growth and body composition traits. Genomic DNAs were extracted from 400 chickens from four different commercial broiler lines. Genotyping for the TGF-β3 gene using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method and BslI restriction endonuclease showed a mutation in 294-bp fragment located on the fourth intron of chromosome 5. Polymorphism in TGF-β3 gene was significantly (P < 0.1) associated with breast muscle weight (BMW), abdominal fat weight (AFW), wing weight (WINW), percentage of carcass weight (%CW), percentage of drumstick weight (%DW), percentage of breast muscle weight (%BMW), percentage of back weight (%BAKWT) and percentage of wing weight (%WINW). This research suggests that TGF-β3 gene could be a candidate gene that can affect some body composition traits in chicken.
Key words: Broiler lines, body composition traits, transforming growth factor beta 3 (TGF-β3), PCR-RFLP.