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Genetic variations in locally adapted turkeys. 1. Additive and non-additive genetic effects on growth traits

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Author(s): V.M.O. Okoro | U.E. Ogundu | O. Kadurumba | M.U. Iloeje | C.L. Okoro | R.J.Nosike | S.N. Ibe

Journal: Genomics and Quantitative Genetics
ISSN 2157-9903

Volume: 4;
Issue: 1;
Start page: 1;
Date: 2012;
Original page

Keywords: body measurements | crossbreeding | diallel cross | plumage color

ABSTRACT
Three locally adapted parental turkey lines of black (B), bronze (Br) and white (W) plumage coloured genotypes were crossed in full diallel arrangement. Each line comprised of 7 males and 15 females and a total of 285 poults were measured. General combining ability (GCA), specific combining ability (SCA) and reciprocal effects (RE) were estimated for six traits at 12 weeks old: body weight (BWT), breast width (BrWt), drumstick length (DSL), shank length (SL), keel length (KL), and body length (BL). There were significant cross and sex effects (P < 0.05) but no significant interaction. The GCA was not significant for any trait but SCA was significant (P < 0.01) for all morphometric traits but not for BWT. The estimates ranged from 0.61 for BWT to 8.33 for BL, 0.68 for BWT to 9.23 for BL, and 0.507 for BWT to 8.88 for BL in BxBr, BxW and BrxW crosses respectively. RE was not significant in any of the traits. The non-significant GCA estimates along with the significant SCA estimates suggest that genes governing the six traits measured do not act additively but improvement may be attained by exploiting crossbreeding. The lack of significant reciprocal effects indicates that maternal effects are not important and reciprocal crosses may be used without loss of biological performance in the progeny.
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