EFFECT OF EARLY COLD EXPOSURE ON THE ENDOCRINE RESPONSES OF BROILER CHICKENS AND THE INCIDENCE OF ASCITES SYNDROME

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BAHADORAN SH.; HASANZADEH MOHAMMAD

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Journal: Iranian Journal of Veterinary Medicine Year:2010 | Volume:4 | Issue:1 Page(s): 11-16

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Title

EFFECT OF EARLY COLD EXPOSURE ON THE ENDOCRINE RESPONSES OF BROILER CHICKENS AND THE INCIDENCE OF ASCITES SYNDROME

Author(s)

BAHADORAN SH. | HASANZADEH MOHAMMAD | Issue Writer Certificate

Keywords

BROILER CHICKENSQ2

ASCITES SYNDROMEQ3

COLD EXPOSUREQ3

THYROID HORMONESQ3

Abstract

Two hundred and fifty day-old BROILER CHICKENS were housed in a high altitude farm and divided in two experimental groups (cold-exposed and control). At the age on and 4 d, the cold-exposed chickens were exposed to 15oC for 3 h, while the control birds were reared under normal condition. During the period between 14 and 28 days, both groups of chickens were exposed to a low environmental temperature. For hormonal analyses, blood samples were taken at days three and four (before and after COLD EXPOSURE), and followed by samples taken at seven, 14, 28 and 42 days. The mean plasma corticosterone level was significantly higher in cold chickens, who were first exposed to cold temperature at days three and four of age. However, this result was reversed at day 28 during the second cold challenge. Cold-exposed birds showed significantly higher T3 levels compared to control chickens at day three after exposure to cold temperatures. During the second COLD EXPOSURE (day 28), the T3level was significantly lower in cold chickens compared to control chickens. At days three (after COLD EXPOSURE) and four (before COLD EXPOSURE), the concentrations of T4 were significantly lower in cold-exposed chickens compared to the control chickens. Such hormonal responses coincided with a marked reduction of ascites mortality in the early cold-exposed chickens compared with control chickens. In the present study, repeated COLD EXPOSURE resulted in a moderate response; lower corticosterone and TJ levels resulted from the second COLD EXPOSURE than from the first one alone. It can be concluded that early COLD EXPOSURE improves the thermotolerance of BROILER CHICKENS at a later age, which consequently leads to an adaptation that reduces the incidence of the ASCITES SYNDROME.

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APA: Copy

HASANZADEH, MOHAMMAD, & BAHADORAN, SH.. (2010). EFFECT OF EARLY COLD EXPOSURE ON THE ENDOCRINE RESPONSES OF BROILER CHICKENS AND THE INCIDENCE OF ASCITES SYNDROME. IRANIAN JOURNAL OF VETERINARY MEDICINE (INTERNATIONAL JOURNAL OF VETERINARY RESEARCH), 4(1), 11-16. SID. https://sid.ir/paper/157883/en

Vancouver: Copy

HASANZADEH MOHAMMAD, BAHADORAN SH.. EFFECT OF EARLY COLD EXPOSURE ON THE ENDOCRINE RESPONSES OF BROILER CHICKENS AND THE INCIDENCE OF ASCITES SYNDROME. IRANIAN JOURNAL OF VETERINARY MEDICINE (INTERNATIONAL JOURNAL OF VETERINARY RESEARCH)[Internet]. 2010;4(1):11-16. Available from: https://sid.ir/paper/157883/en

IEEE: Copy

MOHAMMAD HASANZADEH, and SH. BAHADORAN, “EFFECT OF EARLY COLD EXPOSURE ON THE ENDOCRINE RESPONSES OF BROILER CHICKENS AND THE INCIDENCE OF ASCITES SYNDROME,” IRANIAN JOURNAL OF VETERINARY MEDICINE (INTERNATIONAL JOURNAL OF VETERINARY RESEARCH), vol. 4, no. 1, pp. 11–16, 2010, [Online]. Available: https://sid.ir/paper/157883/en

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