INFLUENCE OF THERMAL MANIPULATION DURING EMBRYONIC DEVELOPMENT ON HATCHABILITY TRAITS AND SECONDARY SEX RATIO OF BROILER CHICKS | ||||
Egyptian Poultry Science Journal | ||||
Article 7, Volume 39, Issue 4, December 2019, Page 825-833 PDF (517.24 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/epsj.2019.67488 | ||||
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Authors | ||||
Ayat Ramadan El-zeniny1; Ahmed M. El-Kaiaty2; Hewida M. H. El-Allawy3; Hosam M. Safaa2; Gamal M. Kamel2; Alaa K. Alm El-Din4; Nafisa A. Abd El-Azeem5 | ||||
1Animal Production Department, National Research Center, Giza, Egypt | ||||
22Anim.Prod. Dep., Fac. of Agric., Cairo Univ., Giza, Egypt, | ||||
31Anim. Prod. Dep., Nation.Res. Centre, Giza, Egypt, | ||||
43Anim. Prod. Res. Inst., Agric. Res. Centre, Minis. of Agric., Giza, Egypt | ||||
51Anim. Prod. Dep., Nation.Res. Centre, Giza, Egypt | ||||
Abstract | ||||
The current study was conducted to investigate the influence of thermal manipulation (TM) during embryogenesis on hatchability traits, secondary sex ratio and hatchling weights of broiler chicks. A total of 1200 fertile eggs obtained from Cobb-500 breeder broilers parent stock were used in this study. The eggs were randomly distributed into 4 experimental groups. Incubation conditions from day 1 to day 18 were 37.5°C and 52% relative humidity for control group (TM0). while incubation temperature of the thermally treated groups during 13-15 days of incubation was increased to 39ºC for 2 hours in the second group (TM2), 4 hours in the third group (TM4) and 6 hours in the fourth group (TM6). At hatch, the hatchability traits and embryonic mortality (EM) were calculated; all hatched chicks were sorted, sexed and individually weighed. The obtained results showed that, Thermal manipulation did not adversely affect hatchability and embryonic mortality rate, but there was a positive significant effect on the normality of hatched chicks. However there were non-significant differences in the secondary sex ratio of hatched chicks. Thermal treatment did not significantly effect on body weight of hatching chicks. | ||||
Keywords | ||||
thermal manipulation; embryogenesis; hatching parameters; broiler chicks | ||||
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