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• W2555493003 abstract "The present study was carried out in South Sinai Research Station, located at Ras Suder that belongs to the Desert Research Center, Ministry of Agriculture and Land Reclamation, Egypt. This work aimed at studying the effect of heat shock programs during growth period on thermo-respiratory responses and performance of White Leghorn laying hens reared under hot desert conditions during first 90 days of egg production. Four hundred-one day old of female White Leghorn chicks were randomly divided into four equal treatments (100 chicks each). The 1 st treatment(T1) served as control (non-exposure to heat shock during growth period) while the chicks of 2 nd , 3 rd and 4 th treatments were exposed to heat shock (40±1 ° C for 4 hours (h) from 12:00 - 16:00 for 3 consecutive days). The 2 nd treatment (T2) was exposed at 3 days of age (early heat shock exposure), the 3 rd treatment (T3) was exposed to heat shock at 3 days and at 8 weeks of age and the 4 th treatment (T4) was exposed to heat shock at 3 days and at 8 and 16 weeks of age. During growth period, all treatments after the heat shock exposure period returned to be reared under natural conditions. During first 90 days of egg production, all treatments reared under hot desert conditions and through this period, they were exposed to heat challenge (38±1 °C for 4 h from 12:00 - 16:00) at 24 and 34 weeks of age). Results showed that thermo-respiratory response (rectal temperature and respiration rate)significantly decreased in the T3 and T4 compared with T1 (control). On the other hand, there were no significant differences between T1 and T2 in rectal temperature and respiration rate. Moreover, there were no significant differences among T2, T3 and T4 in rectal temperature. There were no significant differences among the four treatments in total protein, glucose, cholesterol, estradiol-17β (E2) and progesterone. Nevertheless, globulin increased, while albumin and A/G ratio decreased (P< 0.05) in T4 compared with other treatments. Serum phosphorus level significantly decreased in T3 and T4 as compared to T1 and T2, but, calcium level increased (P< 0.05) in T4 compared with T1, T2 and T3. Average egg number and egg mass increased (P< 0.05) in T4 compared with T1 (Control), while, there were no significant differences among T1, T2 and T3 in such two traits. On the other hand, T3 had significant increase in average egg weight compared with T1. Mortality rate decreased (P< 0.05) in the hens of T4 and T3 by 42.8 and 35.7 %, respectively and insignificantly decreased by 14.2 % in T2 compared to that of T1.Egg shell thickness enhanced (P< 0.05) in T4 compared with other treatments. It can be concluded that, exposure of White Leghorn laying hens to heat shock (40±1 ° C for 4 h from 12:00 - 16:00 for 3 consecutive days) at 3 days and 8 weeks of age or at 3 days and at 8 and 16 weeks of age alleviate some of the negative effects of heat stress" @default.
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• W2555493003 date "2012-01-01" @default.
• W2555493003 modified "2023-09-27" @default.
• W2555493003 title "EFFECT OF USING HEAT SHOCK PROGRAMS ON THERMO- RESPIRATORY RESPONSES AND PERFORMANCE OF LAYING HENS UNDER DESERT CONDITIONS" @default.
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