اثرات برنامه‌های نوری بر سیستم ایمنی و عملکرد جوجه‌های گوشتی

نویسندگان

1 دانشجوی کارشناسی ارشد گرایش فیزیولوژی گروه علوم دامی دانشگاه ارومیه

2 عضو هیئت علمی گروه علوم دامی دانشگاه ارومیه

چکیده

با هدف بررسی تأثیر برنامه‌های نوری مختلف بر عملکرد و سیستم ایمنی جوجه‌های گوشتی، 288 قطعه جوجه نر هفت روزه راس 308 به سه گروه 96 تایی با هشت تکرار (با میانگین وزن مساوی) تقسیم شدند وجوجه‌های هر گروه به طور تصادفی در سالنی مجزا درپنهای 12 تایی قرار گرفتند، ازروزهشتمتا 35 روزگی پرندگان سالن یک، با یک ساعت خاموشی(CL)، سالن دو، با شش ساعت خاموشی مداوم (EL) ، سالن سه، با ده ساعت خاموشی داوم (FL) پرورش داده شدند. در تمام سالن‌ها، به جز برنامه نوری تمام شرایط مدیریتی یکسان بود و تمام گروه‌ها درطول دوره پرورش، با خوراک آماده به شکل پلت تغذیه شدند. در طول دوره آزمایش، مقدار خوراک مصرفی، افزایش وزن بدن و ضریبت بدیل خوراک، اندازه‌گیری و محاسبه گردید. با هدف مطالعه تأثیر خاموشی برروی سیستم ایمنی پرنده، در روز 35 پرورش با خونگیری از ورید بال و جداسازی سرم، مقادیر ایمنوگلوبولین تام، کمپلمان تام، پروتئین تام و آلبومین تام سرم برآورد گردید. با آنالیز نتایج حاصله تفاوت معنی‌داری در مقدار خوراک مصرفی و افزایش وزن بدن پرندگان تیمارهای مختلف در دوره 7 تا 42 روزگی مشاهده نشد (P>0/05) . ضریب تبدیل خوراک پرندگانFL کمتر از پرندگانCL بود (0/05≤P). افزایش قابل توجهی در مقادیر ایمنوگلوبولین تام، کمپلمان تام و پروتئین تام سرم تیمار ده ساعت خاموشی نسبت به گروه شاهد حاصل شد (0/05≤P). نتیجه‌گیری کلی اینکه استفاده از خاموشی بلند مدت در پرورش جوجه‌های گوشتی در این مطالعه نه تنها موجب کاهش مصرف خوراک و وزن بدن پرنده نشد بلکه در کنار بهبود ضریب تبدیل خوراک، سیستم ایمنی ذاتی و هومورال بدن پرنده را نیز تقویت نمود.

عنوان مقاله [English]

Effects of lighting programs on immune system and performance of broiler chickens

نویسندگان [English]

  • H Hosseini Fahreji 1
  • R Najafi 2
1 Master of Science Student of Physiology, Agriculture Faculty, Urmia University
2 Scintific Staff of Animal Science Department, Agriculture Faculty, Urmia University.
چکیده [English]

The aim of this study was to evaluate the effects of three lighting programs on immune system and performance of broiler chickens. A total of 288 seven day-old male broiler chicks (Ross-308) were randomly distributed between three treatments. Each group was housed in the separated room with eight pen and 12-birds per pen. The management conditions were similar for all treatments throughout the experimental period except lighting programs which were provided as follow: 1) 23 h light (L): 1 h dark (23L:1D), 2) 18 h L: 6 h D (18L:6D) and 3) 14 h L: 10 h D (14L:10D). During the experimental period, feed intake, body weight gain and feed conversion ratio were measured. At the end of 5th-week, two birds from each pen with average weight of pen were selected for determining titer of total immunoglobulin, total complement, total albumin and total protein factors. Results did not show any differences between the experimental treatments in feed intake and body weight gain (p>0.05) but FCR was improved in 14L:10D treatment in compare with 23L:1D group (p<0.05). The amount of total immunoglobulin, total protein and total complement factors, were increased in 14L:10D treatment compared to 23L:1D group (p<0.05). It is concluded that long darkness improved feed conversion ratio, innate and humeral immune system responses of birds, however, did not have any negative effect on feed intake and body weight gain.

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