Determining the optimal level and the effect of different zinc sources on performance, egg quality and the immune system of laying hens at the end of the production period.

Autor: Alirezaei Shahraki P; Department of Animal Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran., Kheiri F; Department of Animal Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran., Amanlou H; Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran., Faghani M; Department of Animal Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran., Jalali SMA; Research Center of Nutrition and Organic Products (RCNOP), Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
Jazyk: angličtina
Zdroj: Veterinary medicine and science [Vet Med Sci] 2024 Sep; Vol. 10 (5), pp. e70035.
DOI: 10.1002/vms3.70035
Abstrakt: Background: Trace elements, such as zinc, magnesium and copper, are essential for improving the performance and health of broiler breeders and the development of chicken embryos. These elements are integral to various proteins involved in metabolism, hormone secretion and the immune system, necessitating their inclusion in small amounts in poultry diets.
Objectives: This study aimed to determine the optimal level and effect of different zinc sources on performance, egg quality and the immune system of laying hens at the end of the production period.
Methods: The experiment involved 520 Lohmann LSL laying hens, aged 80 weeks, divided into 13 treatments with 5 replications and 8 birds per replication. The hens were fed diets supplemented with 40, 60 and 80 mg/kg of zinc from various sources: mineral zinc oxide, mineral zinc sulphate, organic zinc chelated with glycine and organic zinc chelated with an organic acid. Key parameters measured included body weight, egg weight and immune response.
Results: The basal diet contained 63.58 mg/kg of zinc, with the requirement per the Lohmann LSL guideline being 80 mg/kg. Zinc supplementation significantly increased body weight in the second month, with 80 mg/kg being the optimal dose. Zinc oxide notably increased egg weight compared to the control. The hens utilized zinc from all sources, resulting in weight gain and improved parameters such as egg quality. Immune parameters were also positively influenced by zinc supplementation.
Conclusions: Zinc supplementation at appropriate levels enhances the performance and egg quality of laying hens, particularly at the end of the production period. It improves bioavailability, enriches eggs and mitigates age-related declines in productivity.
(© 2024 The Author(s). Veterinary Medicine and Science published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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