الفهرس 
Introduction
Experimental proceduresOnly 14 pages are availabe for public view
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Abstract
This work was planned to study the effect of some microclimatic stressors on rabbits vitality. So, some experiments were performed on New Zealand White females.:
(1) Effect of heat stress on some productive and reproductive parameters.2) Effect of lighting duration on some productive and reproductive parameters.3) Effect of feed restriction on some productive and reproductive parameters.4) Effect of water deprivation on some productive and reproductive parameters. Group (1) was exposed to high temperature and humidity (33 (R+(B2c and 80 (R+ (B1%, respectively). Group2 was kept under long lighting technique) 16L: 8D). Group3 offered 75%of feed offered to control group. Group4was offered water for only 4hours/day. The data collected were temperature and humidity daily, daily feed and water intake, averages of feed conversion ratio and water/feed ratio weekly. After 3 month from stress exposure, females were mated to show the influence of stress on reproductive parameters including conception rate, gestation period, litter traits (size, weight and mortality). Blood samples were collected from control and heat stressed groups at the end of each week to be analyzed for serum cortisol hormonal level. It is evident from the study that heat stress had the greatest effect on rabbit productive and reproductive performance.Then water deprivation and feed restriction and lighting period had the lowest effect. All hygienic and prophylactic measures should be taken to obtain the highest benefit from rabbit rearing with all necessary medications and vaccination programs. Breeders should had lower feed intake, heavier body weight, higher body gain and better feed conversion than those from eggs stored at 18C for 7 days. While chicks hatched from fumigated eggs stored for 14 days at 10C had lower feed intake, heavier body weight, higher body gain and better feed conversion than chicks hatched from fumigated eggs stored at 18C for 7 days. chicks hatched from eggs dipped in gentamicine solution had lower feed intake, heavier body weight, higher body gain and better feed conversion compared with those hatched from gentamicine injection, Biosentry 904 spraying and control group. The study also discussed the importance of optimum storage conditions (storage time and temperature ) in order to have higher hatchability percentage, the importance of preincubation treatments to decrease bacterial contamination on egg shell with prevention of its invasion into the egg contents and reaching the highest performance of hatched chicks.