Impacts of Dietary L-Threonine Supplementation on Performance and Intestinal Morphology of Broiler Chickens during Summer Time
محورهای موضوعی : Camelک. شیرزادگان 1 , ا. نیکخواه 2 , م.ع. جعفری 3
1 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
2 - Department of Animal Science, Faculty of Agriculture, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
3 - Department of Animal Science, Faculty of Agriculture, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
کلید واژه: Performance, broiler chickens, intestinal morphology, L-threonine,
چکیده مقاله :
The present study evaluated effects of 0.0%, 0.5%, 0.75% and 1.0% L-threonine in diet on performance and gastrointestinal tract development in broiler chickens during summer. From 0 to 42 days old, body weight gain was greater in 0.75% L-threonine fed birds than in 0.0% and 0.5% L-threonine fed birds (P<0.05). Moreover, in jejunum and ileum both the 0.75% and 1.0% L-threonine intake caused longer villus height as compared to 0.0% and 0.5% L-threonine (P<0.05), but no other morphological parameters were affected by L-threonine supplementation (P>0.05). No significant differences were observed between the treatments for feed intake and feed conversion ratio during the starter, grower or whole experimental period (P>0.05). During the growth period, 0.75% L-threonine fed birds had the highest body weight gain (P<0.05). Carcass traits were not affected by treatments (P>0.05). In conclusion, supplementation of 0.75% L-threonine improved the intestinal morphology and body weight gain of broilers under hot conditions. As well as, the higher levels of L-threonine (1.0) percent in diet can will increased the villus height in the jejunum and ileum.
مطالعه حاضر به منظور اثرات افزودن مقادیر 0، 5/0، 75/0 و 1 درصد ال-ترئونین در جیره روی عملکرد و توسعه روده جوجه‌های گوشتی در زمان تابستان صورت گرفت. از 0 تا 42 روزگی، میزان افزایش وزن بدن پرندگان تغذیه شده با 75/0 درصد ال-ترئونین بیشتر از پرندگان تغذیه شده با 0 و 5/0 درصد بود (05/0(P<. علاوه بر این، در ژئوژنوم و ایلئوم مصرف 75/0 و 1 درصد ال-ترئونین نسبت به 0 و 5/0 درصد، موجب افزایش بیشتر طول پرزها گردید (05/0P<)، اما سایر فاکتورهای مورفولوژیکی تحت تأثیر مکمل‌سازی ال-ترئونین قرار نگرفت (05/0(P>. هیچ تفاوت معنی داری برای مصرف خوراک و ضریب تبدیل در طی دوران آغازین، رشد و کل دوره آزمایش در بین تیمارها مشاهده نشد (05/0P>). در طی دوره رشد، پرندگان تغذیه شده با 75/0 درصد ال-ترئونین بیشترین افزایش وزن بدن را نسبت به سایرین داشتند (05/0P<). در ضمن، صفات لاشه نیز تحت تأثیر تیمارها قرار نگرفت (05/0P>). به طور کل، افزودن 75/0 درصد ال-ترئونین موجب بهبود مورفولوژی روده و افزایش وزن بدن جوجه‌های گوشتی قرار گرفته در شرایط گرم آب و هوایی می‌شود. علاوه بر این، سطوح بالاتر ال-ترئونین (1 درصد) در جیره می‌تواند موجب افزایش ارتفاع پرز ژئوژنوم و ایلئوم جوجه‌های گوشتی گردد.
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