Effect of Stocking Density and Methionine Levels on Growth Performance and Immunity of Broiler Chicks

محورهای موضوعی : Camel

س. حیدری ¹ (Department of Animal Science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran)
م. طغیانی ² (Department of Animal Science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran)

تاریخ دریافت : 1396/07/03 تاریخ پذیرش : 1396/11/11 تاریخ انتشار : 1397/06/10

کلید واژه: Performance, Broiler, immunity, methionine,

چکیده مقاله :

The experiment was conducted to investigate the effect of stocking density and incremental methionine levels on performance, immune response, carcass traits, and digestive organs of broiler chicks. A total of 390 day-old broiler chicks (Ross 308) were allocated to six dietary treatments and five replicates base on 3 × 2 factorial arrangement in a completely randomized design. Experimental diets included three levels of stocking density (12, 16 and 18 birds/m2) and two levels of methionine (100 and 120% requirement recommended for Ross 308) applied during 42 days of experiment. The results showed that 18 birds density decreased body weight and weight gain, feed intake and increased feed conversion ratio (P<0.05) in overall rearing period. The 120% methionine level tended to increase body weight at 42 day of age. Stocking density significantly (P<0.05) affected the relative weight of proventriculus, pancreas, gizzard and duodenum. The jejunum relative weight and ileum length of chicks received 120% methionine level significantly increased. Antibody titer against sheep red blood cells (SRBC), Influenza and Newcastle viruses, heterophil to lymphocyte ratio and lymphoid organs except spleen were not affected by dietary treatments (P<0.05). As a conclusion, broiler performance of chicks adversely affected by stocking density and methionine levels had no considerable effect on their performance.

چکیده انگلیسی:

آزمایش حاضر به منظور بررسی اثر تراکم گله و سطوح افزایشی متیونین بر عملکرد، پاسخ ایمنی، ویژگی‌های لاشه و اندام‌های گوارشی جوجه‌های گوشتی انجام شد. در این آزمایش 390 قطعه جوجه گوشتی یکروزه (راس 308) به صورت کاملاً تصادفی در قالب طرح کاملاً تصادفی به صورت آزمایش فاکتوریل 2 × 3 با 6 تیمار و 5 تکرار اختصاص یافتند. تیمارهای آزمایشی شامل: 3 سطح تراکم گله (12، 16 و 18 جوجه در مترمربع) و 2 سطح متیونین (100 و 120 درصد توصیه شده برای سویه راس 308) در 42 روز آزمایش استفاده شدند. نتایج نشان داد که تراکم 18 در کل دوره پرورش وزن بدن، افزایش وزن بدن و مصرف خوراک را کاهش و ضریب تبدیل غذایی را افزایش داد (05/0>P). در سن 42 روزگی در سطح 120 درصد متیونین وزن بدن تمایل به افزایش داشت. تراکم گله به طور معنی‌داری وزن نسبی پیش معده، پانکراس، سنگدان و دئودنوم را تحت تأثیر قرار داد (05/0>P). جوجه‌هایی که سطح 120 درصد متیونین دریافت کردند، وزن نسبی ژژنوم و طول ایلئوم آنها به طور معنی‌داری افزایش یافت (05/0>P). تیتر آنتی‌بادی علیه سلول‌های قرمز خون گوسفند (SRBC)، ویروس‌های نیوکاسل و آنفلوانزا، نسبت هتروفیل به لنفوسیت و ارگان‌های لنفوئیدی به جز طحال تحت تأثیر تیمارهای آزمایشی قرار نگرفتند (05/0>P). در مجموع، تراکم جیره اثر منفی بر عملکرد جوجه‌های گوشتی داشت و سطوح متیونین اثر قابل توجهی بر عملکرد آنها نداشت.

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