This experiment was designed to investigate and compare the egg production, fertility, hatchability and immune responses of some local developed Egyptian chicken strains under high ambient temperatures. A total of 108 (26 weeks old) laying hens of Matrouh, Silver Montazah, Mandarah and Inshas (9 hens × 3 replicates × 4 strains) were used to evaluate the impact of thermal stress (24-34ºC) during summer season (June, July and August) on egg production, fertility, hatchability and immune responses. The obtained results revealed that final body weight (FBW/g) and body weight change (BWC/g) among different chicken strains were not affected. The daily feed consumption (FC/g) and feed conversion ratio (FCR) for Silver Montazah and Inshas strains were significantly (p ≤ .05) higher than those of Matrouh and Mandarah strains. The mean egg production (EP/%) and egg mass (EM) for Silver Montazah and Inshas strains were significantly (p ≤ .05) higher than those of Matrouh and Mandarah strains. The highest percentages of hatchability of total eggs (HTE) and fertile eggs (HFE) were recorded in Inshas chickens, while the lowest value was recorded in Mandarah chickens. Also, the highest embryonic mortalities (p ≤ .05) and lowest chick weight at hatch (CWH/g) were recorded in Mandarah chickens compared with the other strains. The highest values for antibody titres against phytohemagglutinin-P (PHA-P) were recorded in Mandarah chickens, while the least values were recorded in Inshas chickens.

中文翻译：

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高环境温度下某些鸡种的产蛋量、繁殖力、孵化率和免疫反应

本实验旨在调查和比较一些当地发达的埃及鸡品系在高环境温度下的产蛋量、繁殖力、孵化率和免疫反应。共有 108 只（26 周龄）Matrouh、Silver Montazah、Mandarah 和 Inshas（9 只母鸡 × 3 个重复 × 4 个品系）的蛋鸡用于评估夏季（6 月， 7 月和 8 月）对产蛋量、繁殖力、孵化率和免疫反应的影响。所得结果表明，不同鸡群的最终体重（FBW/g）和体重变化（BWC/g）没有受到影响。Silver Montazah 和 Inshas 菌株的日饲料消耗量 (FC/g) 和饲料转化率 (FCR) 显着 ( p ≤ .05) 高于 Matrouh 和 Mandarah 菌株。Silver Montazah 和 Inshas 菌株的平均产蛋量 (EP/%) 和蛋重 (EM) 显着 ( p  ≤ .05) 高于 Matrouh 和 Mandarah 菌株。Inshas 鸡的总蛋 (HTE) 和受精蛋 (HFE) 的孵化率最高，而 Mandarah 鸡的最低值。此外， 与其他品系相比，Mandarah 鸡的胚胎死亡率最高 ( p ≤ .05) 和最低雏鸡体重 (CWH/g)。Mandarah 鸡的抗植物血凝素-P (PHA-P) 抗体滴度最高，而 Inshas 鸡的抗体滴度最低。