USING GENERAL AND SPECIFIC COMBINING ABILITIES TO EXPECTED BREEDING VALUES, GENETIC VALUES AND HYBRID PERFORMANCE IN CHICKENS | ||||
| Egyptian Poultry Science Journal | ||||
| Article 19, Volume 37, Issue 4, December 2017, Page 1289-1302 PDF (477.54 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/epsj.2017.5654 | ||||
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| Abstract | ||||
| The objectives of this study were to investigate the difference in body weight due to crossing of one exotic meat type strain [Sasso chickens (SS)] and one developed local chicken strain [Gimmizah (GG)] in a full 2×2 diallel design to estimate crossbreeding effects [direct additive effect, heterotic effect, reciprocal effect, general combining ability (GCA), and specific combining ability (SCA)]. Therefore, using general and specific combining abilities were predicted of breeding values (BV) and genetic values (GV). Full diallel crossing 2x2 among these genotypes had been done (2 purebreds and 2 crossbreds). Body weight for males and females from hatch to 12 wks of ages were recorded for different produced genotypes. The obtained results showed that within pure breed mating, the (SS) chicks were significantly (P<0.001) heavier at the different studied ages compared to the (GG) chicks. Within crosses mating, S×G cross chicks were superior chicks compared to G×S cross chicks at hatch, 4, 8 and 12 wks of ages. The most of heterosis estimates (H %) for body weight at the different studied ages for both sexes of S×G cross were positive and high compared to those of the reciprocal cross (G×S) which the most values were negative H%. Also, the reciprocal effects were positive (2.34, 27.04, 65.80 and 139.76 g) for overall BW means at the aforementioned ages, respectively. These results indicated that using Sasso as a sire of (S×G cross), BW was improved compared to that of the reciprocal cross (G×S) at the different studied ages. All values of GCA for SS were positive and had high estimates compared to that of GCA for GG. Also, the cross SxG had high and positive SCA values compared to GxS cross. The highest positive expected breeding values of BW were realized for Sasso strain at the different studied ages. Also, expected genetic values for crosses showed that the progeny of S×G cross had the highest positive values for most of BW in both of the males and females for the different studied ages. No differences (g) between the actual and expected BW were found at all ages studied. In conclusion, crossing between Sasso sires (exotic meat type strain) and Gimmiza dams (developed local strain) improved significantly body weight at the different studied ages compared to mating of Gimmiza as sires. | ||||
| Keywords | ||||
| diallel crossing; General and specific combining abilities; Breeding value | ||||
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