Effect of photo-stimulation on some egg production traits in broiler parents [electronic resource].

Includes reference

A total of (5612 bird (4880 female + 732 male}) 1-d-old Cobb 500 broiler breeder pullets were randomly assigned to rearing house. All chicks were brooded and reared in rearing house under similar environmental, managerial and hygienic conditions throughout the trial period. A "Step down-step up" lighting program was used during brooding, rearing and production periods. were given continuous light during the first 2 d post hatch, were reared on 8-h photoperiods between 2 d and 20 wk of age, and were then transferred abruptly to 10-, 11-, 12-, 14-, or 15-h photoperiods at 20 wk. Controls remained on 8 h at 20 wk. The photoperiod was changed from 8 h Light/d to 15 h light/d. in order to estimate Body weight (BW), Growth Rate (GR), Feed Consumption (FC), Egg weight (EW), Egg production (H.H&H.D), Fertility (F), Hatchability (H), Number of chicken (CN), Age at sexual maturity (ASM). The main results obtained can be summarized as follows: 1. There were significant differences (P<-0.05 ) between males and females for body weight, feed consumption and mortality. 2. There are positive correlations between hen day production and egg weight, hatchability, fertility and number of chickens which ranged from (0.197 to 0.991). 3. The control group (C) reached sexual maturity earlier (164d), than the other groups which reached at (170 d and 174d) G2,G1 respectively. 4. There were significant differences (P<-0.05 ) between groups for feed consumption. 5. There were significant differences (P<-0.05 )' between phases for body weight, growth rate and feed consumption.

Summary in arabic.

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