Volume 26, Issue 6 (2024)
JAST 2024, 26(6): 1275-1286 |
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Mirfakhraei S P, Zaghari M, Ghaziani F, Abbasi M. Is Dietary Zinc Requirement of Broiler Breeder Hens at the Late Stage of Production Cycle Influenced by Phytase Supplementation?. JAST 2024; 26 (6) :1275-1286
URL: http://jast.modares.ac.ir/article-23-67862-en.html
URL: http://jast.modares.ac.ir/article-23-67862-en.html
1- Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran. , p.mirfakhraei@ut.ac.ir
2- Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.
3- Department of Animal & Poultry Nutrition, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.
2- Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran.
3- Department of Animal & Poultry Nutrition, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.
Abstract: (718 Views)
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.
Article Type: Original Research |
Subject:
Animal Nutration
Received: 2023/03/3 | Accepted: 2023/09/27 | Published: 2024/03/31
Received: 2023/03/3 | Accepted: 2023/09/27 | Published: 2024/03/31
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