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Journal of Agricultural Science and Technology، جلد ۲۶، شماره ۶، صفحات ۱۲۷۵-۱۲۸۶
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عنوان انگلیسی Is Dietary Zinc Requirement of Broiler Breeder Hens at the Late Stage of Production Cycle Influenced by Phytase Supplementation?
چکیده انگلیسی مقاله This experiment was conducted to determine whether 6-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-500 broiler breeder hens (>v4.9 kg) were weighed at 58 weeks of age and assigned to various treatment groups. To deplete the zinc reserves in hens, they were given a zinc-deficient diet (9.5 mg kg-1 of zinc) and drank water with 35 μg L-1 zinc for two weeks. Then, hens were randomly allocated to 8 dietary treatments in a factorial arrangement of two levels of phytase (0, 300 FTU kg-1) and four levels of dietary zinc (30, 60, 90, 120 mg kg-1) with four replicates of 4 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< 0.05) and plasma (P< 0.0001). Egg weight was significantly increased by adding phytase (P< 0.05). As the results of this experiment show, adding exogenous phytase can decrease the zinc requirement of broiler breeder hens by releasing 16.9% of the zinc bound to phytate.
کلیدواژه‌های انگلیسی مقاله Dietary zinc,Exogenous phytase,Nonlinear models,Zinc bound to phytate
نویسندگان مقاله S. P. Mirfakhraei |
Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.

M. Zaghari |
Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.

F. Ghaziani |
Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.

M. Abbasi |
Department of Animal & Poultry Nutrition, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.

نشانی اینترنتی https://jast.modares.ac.ir/article_16988_421a988aefe0366c5989a9a5794896d6.pdf
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