Is Dietary Zinc Requirement of Broiler Breeder Hens at the Late Stage of Production Cycle Influenced by Phytase Supplementation? | ||
| Journal of Agricultural Science and Technology | ||
| Article 8, Volume 26, Issue 6, 2024, Pages 1275-1286 PDF (6.44 M) | ||
| Document Type: Original Research | ||
| DOI: 10.22034/JAST.26.6.1275 | ||
| Authors | ||
| S. P. Mirfakhraei* 1; M. Zaghari1; F. Ghaziani1; M. Abbasi2 | ||
| 1Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Islamic Republic of Iran. | ||
| 2Department of Animal & Poultry Nutrition, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran. | ||
| Abstract | ||
| 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. | ||
| Keywords | ||
| Dietary zinc; Exogenous phytase; Nonlinear models; Zinc bound to phytate | ||
| References | ||
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