Standardized Ileal Digestible Threonine Requirements and Its Effects on Performance and Gut Morphology of Broiler Chicks Fed Two Levels of Protein
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 13، شماره: 4
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 100
فایل این مقاله در 12 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_JASTMO-13-4_007
تاریخ نمایه سازی: 1 آذر 1402
چکیده مقاله:
The objective of this study was to determine the effects of ۸ levels of threonine (۰.۴, ۰.۵,
۰.۶, ۰.۷, ۰.۸, ۰.۹, ۱.۰ and ۱.۱%) and ۲ levels of protein (۱۷.۵ and ۲۰.۵%) on growth
performance, gut sizes and morphology as well as to estimate Standardized Ileal
Digestible (SID) Thr requirements in Ross ۳۰۸ males at ۰ to ۲۱ days of age. Chicks were
randomized into ۶۴ battery cages (۵ chicks per replicate). FI was lower for broiler given
the high CP diets as compared to those fed on low CP diets. BWG and FCR improved up
to ۰.۷% Thr in both CP levels. Fitted broken lines indicated break points at ۰.۶۲ and
۰.۶۶% SID Thr for weight gain at ۱۷.۵ and ۲۰.۵% crude protein, respectively. Significant
interaction was found between CP and Thr on relative weight and length of duodenum
and jejunum (P< ۰.۰۵). Thr supplementation significantly affected villus height, epithelial
thickness, goblet cell number and crypt depth in duodenum, jejunum and ileum (P< ۰.۰۱).
Low CP diets adequate in Lys, Total Sulfur Amino Acid (TSAA) supplemented with Thr
may result in optimal BWG and FCR as well as in growth of intestinal length. Such
parameters of gut functionality as microvilli height, crypt depth and epithelial thickness
seemed to be improved with even higher levels of dietary SID Thr levels.
کلیدواژه ها:
نویسندگان
M. Zaghari
Department of Animal Science, College of Agriculture, University of Tehran, Karaj, Islamic Republic of Iran.
F. Zaefarian
Department of Animal Science, College of Agriculture, University of Tehran, Karaj, Islamic Republic of Iran.
M. Shivazad
Department of Animal Science, College of Agriculture, University of Tehran, Karaj, Islamic Republic of Iran.