Abou El-Ghar, R., Abd El-Karim, R. (2016). EFFECT OF EARLY SELECTION FOR BODY WEIGHT, KEEL LENGTH AND BREAST CIRCUMFERENCE ON EGG PRODUCTION TRAITS IN INSHAS STRAIN OF CHICKENS. Egyptian Poultry Science Journal, 36(2), 375-387. doi: 10.21608/epsj.2016.5419
R.Sh. Abou El-Ghar; Ragaa Abd El-Karim. "EFFECT OF EARLY SELECTION FOR BODY WEIGHT, KEEL LENGTH AND BREAST CIRCUMFERENCE ON EGG PRODUCTION TRAITS IN INSHAS STRAIN OF CHICKENS". Egyptian Poultry Science Journal, 36, 2, 2016, 375-387. doi: 10.21608/epsj.2016.5419
Abou El-Ghar, R., Abd El-Karim, R. (2016). 'EFFECT OF EARLY SELECTION FOR BODY WEIGHT, KEEL LENGTH AND BREAST CIRCUMFERENCE ON EGG PRODUCTION TRAITS IN INSHAS STRAIN OF CHICKENS', Egyptian Poultry Science Journal, 36(2), pp. 375-387. doi: 10.21608/epsj.2016.5419
Abou El-Ghar, R., Abd El-Karim, R. EFFECT OF EARLY SELECTION FOR BODY WEIGHT, KEEL LENGTH AND BREAST CIRCUMFERENCE ON EGG PRODUCTION TRAITS IN INSHAS STRAIN OF CHICKENS. Egyptian Poultry Science Journal, 2016; 36(2): 375-387. doi: 10.21608/epsj.2016.5419
EFFECT OF EARLY SELECTION FOR BODY WEIGHT, KEEL LENGTH AND BREAST CIRCUMFERENCE ON EGG PRODUCTION TRAITS IN INSHAS STRAIN OF CHICKENS
Animal Production Research Institute, ARC, Ministry of Agriculture, Egypt
Abstract
Inshas strain of chicken was subjected to one cycle of early selection for body weight, keel length and breast circumference effect on egg production traits. Best linear unbiased prediction (BLUP) was used for predicting the breeding values and ranking then selecting hens. The selection differentials in G1 were equal to 2.6, 16.7, 72.4, 58.7 g, 0.1, -0.1, 0.6 cm, -9.0 g, 12.0 d, -16.0 egg, 0.6 g, -668 g, -17.0 egg, 1.9 g and -731 g for body weight at hatch (BWH), body weight at 4 weeks of age (BW4), body weight at 8 weeks of age (BW8), body weight at 12 weeks of age (BW12), Shank length (SL), Keel length (KL), Breast circumference (Br), body weight at sexual maturity (BWSM), age at sexual maturity (ASM), egg number at 90 d of production (EN1), egg weight at 90 d of production (EW1), egg mass at 90 d of production (EM1), ), egg number at150 d of production (EN2), egg weight at 150 d of production (EW2), egg mass at 150 d of production (EM2), respectively. These values in stander units were equal to 0.9, 0.3, 0.5, 0.4, 0.01, -0.2, 0.3, -0.06, 0.77, -3.5, 0.15, -3.7, -1.5, 0.5 and -1.3, respectively. The realized genetic gain exceeded the expected genetic gain for BWH, BW4, BW8, BW12, SL, Br, ASM and EW2 2.4, 13.7, 51.9, 39.9, 0.3, 1.4, 5.4, 0.7 vs. 2.0, 3.9, 19.0, 11.0, 0.1, 1.0, 1.9 and 0.1. From the results of the present study, selection was effective in improving body weight traits by the generation (G1) of study. The heritability estimates in this study were moderate to high for most of the traits studied. This is an encouraging factor for more intense selection within the Inshas local chicken population.
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