Effect of Excess Dietary Tryptophan on Performance, Plasma Hormone Levels and Immune Function of Broiler Chickens Reared Under Hot and Humid Summer Conditions
- سال انتشار: 1404
- محل انتشار: مجله علوم طیور، دوره: 13، شماره: 1
- کد COI اختصاصی: JR_PSJG-13-1_004
- زبان مقاله: انگلیسی
- تعداد مشاهده: 127
نویسندگان
Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Imam Avenue, PO Box: ۶۷۱۵۶۸۵۴۲۳, Kermanshah, Iran
Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Imam Avenue, PO Box: ۶۷۱۵۶۸۵۴۲۳, Kermanshah, Iran
Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Imam Avenue, PO Box: ۶۷۱۵۶۸۵۴۲۳, Kermanshah, Iran
Evonik Degussa Iran AG, ۱۹۱۸۹۷۳۵۷۸ Tehran, Iran
چکیده
The effects of L-Tryptophan supplementation on growth performance, hormone levels, and immune function of heat-stressed broiler chickens were investigated. For ۴۲ days, ۴۸۰ male chicks were exposed to repeated cycles of hot temperatures and fed one of four diets: a basic diet (control group) or the same diet with extra L-Tryptophan added at three different levels (۰.۲, ۰.۴, and ۰.۶ g/kg diet). L-tryptophan supplementation did not significantly improve overall growth performance under heat stress. However, broilers fed ۰.۲ and ۰.۶ g/kg L-Tryptophan had a better feed conversion ratio at ۱۰ days old. There were no significant differences in white blood cell counts. Interestingly, L-tryptophan supplementation increased antibody production against Influenza and Newcastle disease viruses at ۱۴ days. Additionally, L-tryptophan influenced hormone levels, slightly decreasing growth hormone and increasing thyroxin at ۱۰ days, with further increases in triiodothyronine observed at ۲۴ and ۴۲ days. While L-tryptophan supplementation did not enhance overall growth performance under heat stress, it positively impacted blood parameters like thyroxin, triiodothyronine, and immune response against specific viruses.کلیدواژه ها
Heat stress, Broiler chicken, Growth hormone, Thyroid hormone, Immune response, Tryptophan supplementاطلاعات بیشتر در مورد COI
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