الفهرس 
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Abstract
The present investigation was done in the Department of
Physiology, Faculty of Veterinary Medicine (Moshtohor), Zagazig
University (Benha branch).
The experimental work was planned under three experimental
conditions (Ex. Condj: experiment I, the birds (Japanese quail) were subjected to high temperature 34 پ} 1°C and fed basal breeder ration , in experiment TIthe birds were received high energy ration and subjected to optimum temperature 18-22 °C while in experiment III the birds received high energy ration and high temperature. A total number of 512 with 52 days old Japanese quail, were initially weighted and then divided into five groups: group 1 (control negative group) that fed normal ration and kept under optimal temperature, group 2 (control positive group) that received no additives, group 3, 4 and 5 were received zinc sulfate, L-caniitine and acetylsalicylic acid (aspirin), respictively. Groups 2, 3, 4 and 5 were exposed to the three experimental conditions (I, II and III). The otained results of the study revealed that:
1) The thermostress (Ex. I) had a hazard effects than other two
experiments on feed consumption, body weight, egg production,
egg weight, egg shell thickness, specific gravity, fertility %,
hatchability, % blood calcium and thyroid hormones levels.
2) Generally the gp.2 was the most affected group under the 3 Ex.
Cond.
3) Zinc sulfate and aspirin kept the feed consumption within control
group level, while the L-carnitine can not eliminate the effects of
the 3 Ex. cond.
4) The body weight of quail would be remaining constant by the 3
additives under the Ex. III Cond., while the 3 additives can not
resist the effects of the 3 Ex. Cond.
5) Zinc sulfate was preferable than aspirin and L-carnitine in keeping the egg production within the control level under the 3 Ex. Cond.
6) Generally, The 3 additives kept the egg weight within control
level under the 3 Ex. Cond.
7) The 3 additives maintained the egg shell thickness, specific
gravity, fertility %, and hatchability % and blood calcium level
under high energy ration condition (Ex.II). In contrast, the 3
additives can not tolerate I and III conditions in the previous
parameters.
8) L-carnitine was the only additives kept the blood T3 within normal level under condition II, while the other 2 additives can not relives the effect of I and III Ex. and T3 decreased significantly.
9) The 3 additives were helped the blood T4 to be constant as in
normal group. Under the 3 Ex. Cond.
1 O)Histopathlogical studies of testes and ovaries in the present study showed that the heat stress leads to increase the rate of atretic ova and degeneration of somniferous tubules cells and decrease in their cell layers.
Conclusion: from the economic point of view, it is clear that, there is a beneficial use of zinc sulfate than L-carnitine and aspirin as an additive to quail ration to alleviate the hazard effects of heat stress and/or high energy ration and keeps the production and reproduction of Japanese quail especially under Egyptian environmental conditions.