Evaluation of Body Surface Temperature in Broiler Chickens during the Rearing Period Based on Age, Air Temperature and Feather Condition

محورهای موضوعی : Camel

م. مقبلی دامنه ¹ , ا. برازنده ² , م. ستایی مختاری ³ , اُ اسماعیلی‌پور ⁴ , ی. بدخشان ⁵

1 - Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran
3 - Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran
4 - Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran
5 - Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran

تاریخ دریافت : 1396/08/12 تاریخ پذیرش : 1396/10/10 تاریخ انتشار : 1397/06/10

کلید واژه: broiler chicken, Linear regression, surface temperature, infrared thermography,

چکیده مقاله :

Thermal comfort zone is a crucial importance in broiler chickens to preserve body temperature homeostasis. Since surface temperature contributes to thermal comfort, body surface temperature can be used to evaluate thermal equilibrium in animals. The heat flow at the boundary layer between broilers’ bodies and the environment differs between feathered and unfeathered areas. The aim of the present investigation was to adopt linear regression models incorporating environmental temperature and age of birds to predict the surface temperatures of the feathered and unfeathered areas. Temperatures of eight different parts on the body surface were measured using an infrared thermometer during the growth period (1-6 weeks). High correlation between the temperature of feathered regions and air temperature showed that these areas respond faster to changes in the rearing environmental temperature. Six equations were developed for predicting mean surface temperature and also differences between the body surface and air temperature as a function of air temperature, age and feathered or unfeathered body parts. As the air temperature increases, mean surface temperature and difference between body surface values raised and declined, respectively (P<0.05). Similar to the body surface temperature, the effect of age on difference between body surface and air temperature was different for feathered and unfeathered regions. According to the results, it is proposed that the deferent between the feathered and unfeathered areas should be incorporated in the models which used to predict broiler chicken body surface temperature.

چکیده انگلیسی:

ناحیه آسایش حرارتی دارای اهمیت حیاتی برای حفظ همئوستازی دمای بدن جوجه­های گوشتی می­باشد. از آنجاییکه دمای سطح بدن در آسایش حرارتی مؤثر می­باشد، می­توان برای ارزیابی تعادل گرمایی در حیوانات از آن استفاده نمود. بخشی از بدن جوجه­های گوشتی به وسیله پرها پوشیده شده است از اینرو، جریان حرارتی در لایه مرزی بین بدن جوجه‌های گوشتی و محیط در نواحی پردار و بدون پر متفاوت است. هدف از پژوهش حاضر بکارگیری مدل­های رگرسیونی خطی با استفاده از دمای محیط و سن برای پیش­بینی دمای سطح بدن در نقاط پردار و بدون پر بود. بدین منظور دمای سطحی 8 نقطه مختلف از بدن جوجه­ها با استفاده از یک دماسنج مادون قرمز در طول دوره 6 هفتگی پرورش اندازه­گیری شد. همبستگی بالای بین دمای نواحی پردار و محیط نشان داد که این نقاط سریعتر به تغییرات دمای محیط پرورش پاسخ می­دهند. برای پیش­بینی میانگین دمای سطح بدن و همچنین تفاوت دمای سطح بدن و محیط به صورت تابعی از دمای هوا، سن و نواحی پردار و بدون پر 6 معادله برازش داده شد. با افزایش دمای محیط میانگین دمای سطح بدن و تفاوت دمای سطح بدن و محیط به ترتیب افزایش و کاهش یافت (05/0>P). اثر سن بر تفاوت دمای سطح بدن و محیط مانند اثر آن بر دمای سطح بدن برای نقاط پردار و بدون پر متفاوت بود. بر اساس نتایج این مطالعه، پیشنهاد می­شود که تفاوت بین نقاط پردار و بدون پر در مدل‌هایی که برای پیش­بینی دمای سطح بدن جوجه­های گوشتی مورد استفاده قرار می­گیرند در نظر گرفته شود.

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