Is Dietary Zinc Requirement of Broiler Breeder Hens at the Late Stage of Production Cycle Influenced by Phytase Supplementation?
- سال انتشار: 1403
- محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 26، شماره: 6
- کد COI اختصاصی: JR_JASTMO-26-6_008
- زبان مقاله: انگلیسی
- تعداد مشاهده: 75
نویسندگان
Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.
Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.
Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.
Department of Animal & Poultry Nutrition, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.
چکیده
This experiment was conducted to determine whether ۶-phytase has a positive effect on zinc requirements, production performance, and zinc content of tissues in broiler breeders at the end of their production cycle. One hundred and twenty-eight obese Cobb-۵۰۰ broiler breeder hens (> v۴.۹ kg) were weighed at ۵۸ weeks of age and assigned to various treatment groups. To deplete the zinc reserves in hens, they were given a zinc-deficient diet (۹.۵ mg kg-۱ of zinc) and drank water with ۳۵ μg L-۱ zinc for two weeks. Then, hens were randomly allocated to ۸ dietary treatments in a factorial arrangement of two levels of phytase (۰, ۳۰۰ FTU kg-۱) and four levels of dietary zinc (۳۰, ۶۰, ۹۰, ۱۲۰ mg kg-۱) with four replicates of ۴ hens in each. Bodyweight, egg production, egg weight, and egg quality were measured during the five-week experimental period. Added zinc significantly increased yolk weight and zinc content of yolk (P< ۰.۰۵) and plasma (P< ۰.۰۰۰۱). Egg weight was significantly increased by adding phytase (P< ۰.۰۵). As the results of this experiment show, adding exogenous phytase can decrease the zinc requirement of broiler breeder hens by releasing ۱۶.۹% of the zinc bound to phytate.کلیدواژه ها
Dietary zinc, Exogenous phytase, Nonlinear models, Zinc bound to phytate.اطلاعات بیشتر در مورد COI
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