Breeding values and their accuracies were estimated using
multi-traits Animal Model for birds with and without records of three local strains of chickens. A total number of 916, 1137 and 1030 chicks from Golden Montazah (GM), Silver Montazah (SM) and Matrouh (MA) strains, respectively, were used. Data of individual body weight at hatch (BW0),
4(BW4), 8 (BW8) and 12 (BW12) weeks of age were collected from a breeding experiment of one generation. Daily gain (DG) traits between intervals of hatch-4 (DG4), 4-8 (DG8) and 8-12 (DG12) weeks were also used. Results show that estimates of heritability (ha2) in GM and SM strains for BW at hatch were higher than that at 12 weeks. The estimates are 0.45 and 0.22 for BW0 and 0.21 and 0.18 for BW12 in GM and SM strains, respectively. For birds with records, the ranges in estimates of predicted breeding value (PBV) in GM, SM and MA strains were 4.6, 4.7 and 4.0
grams for BW0, 31.5, 18.7 and 52.9 grams for BW4, 37.9, 111.2 and 68.2 grams for BW8 and 121.8, 178.2 and 288.8 grams for BW12, respectively. The respective ranges in estimates of PBV for DG traits were 1.15, 0.58 and 1.82 grams for DG4, 2.99, 4.05 and 3.31 grams for DG8 and 9.54, 4.23 and 8.73 grams for DG12. For sires and dams without records in GM, SM and MA strains, the minimum and maximum estimates of breeding values predicted for sires (PBVS) and dams (PBVD) of birds and their ranges for
BW and DG traits had the same trend obtained for birds with records. MA strain recorded the highest ranges of PBV, PBVS and PBVD for most growth traits compared to those recorded by GM and SM strains. Accuracies of minimum and maximum estimates of sires breeding values for BW and DG traits predicted for MA strain were the highest followed by SM
and GM strains. Also, accuracies of predicted breeding values for dams of birds recorded by MA and SM strains were higher than those recorded by GM strain. The averages of accuracies in estimates of predicted breeding
values for sires of birds in the three strains were nearly the same.
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