Production performance, egg quality and some blood parameters of heat‐stressed laying hens as affected by dietary supplemental Vit B6, Mg and Zn

Gholizadeh, Hossein; Torki, Mehran; Mohammadi, Hamed

doi:10.1002/vms3.737

Cited by 4 publications

(2 citation statements)

References 68 publications

(88 reference statements)

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“…Apart from enhancing aesthetic appeal, egg yolk color serves as an indicator of an egg's nutritional composition. Previous studies showed that yolks with deeper hues generally contain higher levels of essential nutrients, such as vitamins A, D, E, and omega-3 fatty acids [12,24]. Additionally, the uniform yellow color of the yolk signifies the health of the chicken flock on the farm.…”

Section: Discussionmentioning

confidence: 99%

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Effects and Mechanisms Investigation of Heat Stress on Egg Yolk Quality in Huaixiang Chickens

Chen,

Yu,

Zhang

et al. 2023

Animals

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The purpose of this study was to examine the effects of high temperature on internal egg yolk quality parameters and their possible mechanisms in Huaixiang chickens. This study consisted of two treatments, and each treatment had six replicates with six birds per cage. A total of seventy-two 26-week-old female Huaixiang chickens were randomly divided into a normal-temperature group (NT) and a high-temperature group (HT) for 6 weeks. And these hens were exposed to 25 ± 2 °C and 32 ± 2 °C, respectively. Their relative humidity was maintained at 55–65%. The results showed that the HT group significantly reduced yolk weight, yolk color, and egg weight compared to the NT group (p < 0.05). Heat stress caused vacuolar degeneration of the liver and reduced the absolute liver weight (p < 0.05). Both yolk triglyceride (TG) and liver TG in the HT group were significantly higher than in the NT group (p < 0.05). However, the liver total cholesterol (TC) level in the HT group was remarkably lower than that in the NT group (p < 0.05). Additionally, heat stress remarkably enhanced SREBP-1c, ACACA, and FASN lipid metabolism-related gene mRNA expression levels in Huaixiang chicken liver after 6 weeks of heat exposure (p < 0.05). Furthermore, the HT group had remarkably reduced total amino acid, Cys, and Tyr levels in the yolk when compared with the NT group in our experiment (p < 0.05). In conclusion, heat stress causes egg yolk quality reduction and abnormal lipid metabolism in Huaixiang chickens. These findings provided novel insights into the role of high temperature on egg yolk parameters and the underlying mechanisms in Chinese indigenous laying hens.

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Section: Discussionmentioning

confidence: 99%

“…The ratio of yolk weight to egg weight was also calculated by recording data. The egg yolk color was measured based on the DSM Yolk Color Fan (DSM Nutritional Products, Basel, Switzerland), which ranges from pale yellow at score 1 to dark orange at score 15 [12].…”

Section: Egg Yolk Quality Indicators Measurementmentioning

confidence: 99%

Effects and Mechanisms Investigation of Heat Stress on Egg Yolk Quality in Huaixiang Chickens

Chen,

Yu,

Zhang

et al. 2023

Animals

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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

Alirezaei Shahraki,

Kheiri,

Amanlou

et al. 2024

Veterinary Medicine & Sci

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BackgroundTrace 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.ObjectivesThis 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.MethodsThe 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.ResultsThe 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.ConclusionsZinc 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.

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Production performance, egg quality and some blood parameters of heat‐stressed laying hens as affected by dietary supplemental Vit B6, Mg and Zn

Gholizadeh

Torki

Mohammadi

2022

Veterinary Medicine & Sci

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Objectives:The effects of dietary supplements, including magnesium sulfate (Mg), zinc oxide (Zn) and vitamin B6 (Vit B6), on the performance of laying hens reared under normal (NC) and heat-stress (HSC) conditions were investigated. Material and Methods: A total of 288 30-week-old Lohmann LSL-Lite laying hens were randomly divided into 48 cages and assigned to receive one of the eight diets with six replicates and six hens per replicate, based on a 2 × 2 × 2 factorial arrangement of treatments. Dietary supplements, including two levels (0 & 600 mg/kg) of Mg, two levels (0 & 30 mg/kg) of Zn and two levels (0 & 8 mg/kg) of Vit B6, in normal and heat-stress conditions, were tested at 30-40 and 41-45 weeks of age, respectively. Results:In the Vit B6 group, a decrease in feed intake (FI), egg production (EP), albumin, Zn, Fe and Mg, and an increase in triglyceride and insulin in HSC were observed, in addition to a decrease in cholesterol and an increase in egg weight (EW) in NC. Supplemental Mg decreased EP, blood triglycerides and copper in NC, and Zn, Fe and Mg in HSC as well. Feeding Zn, increased egg shape index, total protein and copper in addition to yolk index in NC and Fe in HSC. EWs were higher in hens supplemented with Vit B6+Mg in HSC. Increased insulin and decreased glutathione peroxidase activity were detected with the Vit B6+Zn compared to feeding either Vit B6 or Zn in HSC. Conclusions:The results indicated Vit B6 could improve EWs and suppress blood cholesterol in NC. Zn improved the egg shape index in NC.

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Production performance, egg quality and some blood parameters of heat‐stressed laying hens as affected by dietary supplemental Vit B6, Mg and Zn

Cited by 4 publications

References 68 publications

Effects and Mechanisms Investigation of Heat Stress on Egg Yolk Quality in Huaixiang Chickens

Effects and Mechanisms Investigation of Heat Stress on Egg Yolk Quality in Huaixiang Chickens

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

Production performance, egg quality and some blood parameters of heat‐stressed laying hens as affected by dietary supplemental Vit B6, Mg and Zn

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