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Badran, A., Abd-Elaal, S. (2025). Effect of acute heat stress conditions on egg production, eggshell quality, intestinal calcium transport and calbindin of the laying hens. Egyptian Poultry Science Journal, (), -. doi: 10.21608/epsj.2025.24685.1084
Aml Badran; Saad Ahmed Abd-Elaal. "Effect of acute heat stress conditions on egg production, eggshell quality, intestinal calcium transport and calbindin of the laying hens". Egyptian Poultry Science Journal, , , 2025, -. doi: 10.21608/epsj.2025.24685.1084
Badran, A., Abd-Elaal, S. (2025). 'Effect of acute heat stress conditions on egg production, eggshell quality, intestinal calcium transport and calbindin of the laying hens', Egyptian Poultry Science Journal, (), pp. -. doi: 10.21608/epsj.2025.24685.1084
Badran, A., Abd-Elaal, S. Effect of acute heat stress conditions on egg production, eggshell quality, intestinal calcium transport and calbindin of the laying hens. Egyptian Poultry Science Journal, 2025; (): -. doi: 10.21608/epsj.2025.24685.1084

Effect of acute heat stress conditions on egg production, eggshell quality, intestinal calcium transport and calbindin of the laying hens

Articles in Press, Accepted Manuscript, Available Online from 19 May 2025  XML
Document Type: Original Article
DOI: 10.21608/epsj.2025.24685.1084
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Authors
Aml Badran email orcid 1; Saad Ahmed Abd-Elaal2
1Poultry Breeding Department, Animal Production Research Institute
2Accelerators and Ion Sources Department, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt
Abstract
One hundred and fifty Hy-line layer hens, 40 weeks of age were used to study the impact of heat stress on egg production, eggshell quality, intestinal calcium transport and calcium binding protein concentration of the laying hen. Hens were randomly allocated to two groups equally, the first group, that served as a control, was reared at room temperature under thermoneu‌tral condition which ambient temperature was 25±1ºC, while the second group was subjected to 40±1ºC for 5 days (4 hrours daily). Egg production, eggshell quality, serum concentrations of calcium, phosphorous, thyroid, aldosterone and estrogen hormones as well as acid phosphatase and alkaline phosphatase activities were measured. Calcium binding protein concentration and the transport of radioactive calcium (45Ca) across the duodenal were also measured. The results indicated that egg weight, hen-day egg productionand eggshell quality were inversely related to high temperature peroids. Serum calcium, calcium binding protein, phosphrous and alkaline phosphatase values were significantly lowered in heat stressed birds. The highest values for serum acid phosphatase and duodenal calcium transport were recorded for heat-treated hens at the 5th days of heat stress period. Thyroid and estrogen hormones unlike aldosterone hormone concentrations declined under the heat stress conditions.
In conclusion, the present results indicated significant decline in eggshell and intestinal calbindin-D28k which hint on a potential contribution of calbindin in the deterioration of quality characteristics of eggshell under heat stress conditions.
Keywords
Calcium binding protein. eggshell quality; intestine calcium transport; laying hens
Main Subjects
Chicken
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