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Is Dietary Zinc Requirement of Broiler Breeder Hens at the Late Stage of Production Cycle Influenced by Phytase Supplementation?
Seyed Peyman Mirfakhraei 1, Mojtaba Zaghari2 , Fatemeh Ghaziani2 , Mahmood Abbasi3
1- Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran , p.mirfakhraei@ut.ac.ir
2- Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3- Department of Animal & Poultry Nutrition, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Abstract:   (211 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 (>4.9 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 of zinc) and drank water with 35 μg/l 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) and four levels of dietary zinc (30, 60, 90, 120 mg/kg) 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 bound zinc to phytate.
Keywords: Zinc Requirement, Broiler Breeders, Phytase, Late-stage of Production, nonlinear models
Full-Text [PDF 463 kb]   (140 Downloads)    
Article Type: Original Research | Subject: Insect Physiology
Received: 2023/03/3 | Accepted: 2023/09/27 | Published: 2024/03/31
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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.