In this experiment, a total number of 165 birds (150 female + 15 male) from each developed laying hens Silver Montaza and Matrouh layer 20 weeks old up to 40 weeks of age. All bids were weighted and randomly distributed into 5 groups with three replicates per treatment (10 females and 1 male / replicate) with almost similar initial average body weight. Each experimental group was exposed to natural day light and supplemented with Ultraviolet light as in its program light, the main group (control group) exposed to no UV light, the second, third, fourth and fifth groups were exposed to 1, 2, 3 and 4 hours/day respectively to UV light from UV lamps after sunset, and controlled by a timer as following: 1-Hens in the first treatment (Control) were exposed to sun light and yellow lamps to 17h/day without exposed to UV lamps. 2-Hens in the second treatment were exposed to sun light to sunset, UV lamps for 1h/day and supplemented with yellow lamps to the end of light period. 3-Hens in the third treatment were exposed to sun light to sunset, UV lamps for 2h/day and supplemented with yellow lamps to the end of light period. 4-Hens in the fourth treatment were exposed to sun light to sunset, UV lamps for 3h/day and supplemented with yellow lamps to the end of light period. 5-Hens in the fifth treatment were exposed to sun light to sunset and UV lamps for 4h/day without exposed to yellow lamps. Birds were reared under similar condition. The consequences indicated that live body weight (LBW), feed intake (FI), egg mass, some blood components, immune responses to sheep red blood cells were significantly improved (P≤0.05) by exposed birds to UV lamps after sunset supplemented in its program light. It could be concluded that the efficient exposed time to UV lamps was (2-3 hours/day) for silver Montaza and Matrouh developed laying hens.

This experiment was carried out on the Matrouh and Silver Montazah strains which used 120 females + 12 males for each strain to study the effect of interaction between number of day light hours and dietary protein levels on productive, physiological and immunological performance. The groups were as follows: The first group was taken 17 hours lighting /day + 16% dietary protein (control group); the second group was taken 17 hours lighting /day + 18% dietary protein; the third group was taken 15 hours lighting /day + 16% dietary protein; The fourth group was taken 15 hours lighting /day + 18% dietary protein. Theobtained results indicated that the group fed 18% dietary protein gave the lower feed intake and improved feed conversion compared with groups which take 16% dietary protein. The group reared under 17 h lighting /day + 16% dietary protein gave the best egg weight and egg mass compared with groups rearing under 15 h lighting /day and groups had18% dietary protein gave the high egg weight, egg mass and egg production % compared with those take 16% dietary protein. the higher values of egg shell thickness was for group fed 18% dietary protein compared with 16% dietary protein and the groups of Matrouh strain under 17 h lighting /day and 18% and 16% dietary protein and Silver Montazah under 17 h lighting /day and 18% dietary protein gave the higher fertility (%).Matrouh strain reared under 17 h lighting /day and using 18% dietary protein gave the higher values of PCV%, WBC's, lymphocytes, heterophils and H/L ratio. The groups take 17 h dietary /day gave the higher blood total protein level and total cholesterol compared with the groups take 15 h dietary /day. It could be concluded that the best of treated groups was under 17 hour light/day plus preferred that diets containing 18% crude protein for improving productive, physiological and immunological performance for these developed strains in Egypt.