Effect of dietary magnesium, calcium, phosphorus, and limestone grain size on productive performance and eggshell quality of hens

Skřivan, M.; Englmaierová, M.; Marounek, M.; Skřivanová, V.; Taubner, Tomáš; Vít, T.

doi:10.17221/3/2016-cjas

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…Under heat‐ stress exposure, when Vit B6 and Mg used separately as a single supplement, there was no significant increase in EW, however, using the combination of Vit B6 and Mg there was significant increase in EW. In a study by M. Skrivan et al ( 2016 ), they found that increasing the level of dietary Mg (1.52 to 4.0 g/kg diet) increased EW significantly which is not consistent with our results. The source (MgO) and the amount of Mg should be taken into account that may be the reason for this discrepancy.…”

Section: Resultscontrasting

confidence: 99%

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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Section: Resultscontrasting

confidence: 99%

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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“…The individual weight of each egg component was used to calculate the proportion of shell, yolk, and albumen from the egg weight. A QCT shell thickness micrometer (TSS York) was used to determine the egg shell thickness using the method described by Skrivan et al (2016). Haugh unit score was evaluated with a QCH apparatus (TSS York).…”

Section: Doi: 1017221/22/2017-cjasmentioning

confidence: 99%

Differences in oviposition and egg quality of various genotypes of laying hens

Tůmová¹,

Vlčková²,

Chodová³

2017

CZECH J ANIM SCI

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Tůmová E., Vlčková J., Chodová D. (2017): Differences in oviposition and egg quality of various genotypes of laying hens. Czech J. Anim. Sci., 62, 377-383.The differences in egg production traits in six laying hen genotypes (brown-egg hens Bovans Brown, Bovans Sperwer, ISA Sussex; white-egg hen Dekalb White; laying hens with tinted shells Moravia Barred and Moravia BSL) and the interactions of genotype and oviposition on egg quality were evaluated. The genotype affected the laying rate (P ≤ 0.003), mean sequence length (P ≤ 0.001), and time of oviposition (P ≤ 0.001). The brown-egg genotypes laid eggs approximately 1 h earlier than the white-egg genotypes and approximately 2 h earlier than the tinted-egg genotypes. Egg shell strength was the lowest in tinted-egg genotypes (P ≤ 0.001) and declined with the time of oviposition (P ≤ 0.002). Egg shell percentage (P ≤ 0.011) and thickness (P ≤ 0.011) were affected by the interaction of genotype and oviposition. None of the effects affected egg weight; however, the proportion of egg components was significantly influenced by the interaction of genotype and oviposition. The study confirmed that the differences in the egg production and egg quality of various genotypes are associated with the laying pattern.

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“…2016; Skřivan et al . 2016). These earlier studies demonstrate that grit plays a critical role in digestive function not only in mechanically processing food, but also in supplying necessary minerals and helping to clean the digestive tract (Gionfriddo & Best 1999; Wings 2007; Downs et al .…”

Section: Taxon Specimen No Referencesmentioning

confidence: 99%

Quantifying the gastral mass in Early Cretaceous ornithuromorphs (Aves, Ornithothoraces) from the Jehol avifauna

Liu,

Li,

Liu

et al. 2023

Palaeontology

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Some birds intentionally ingest stones to facilitate digestion of hard foodstuffs, a behaviour inherited from non‐avian dinosaurs and present in some of the earliest birds, as evidenced by clusters of gastroliths preserved within the abdominal cavity of a wide range of dinosaurs and Cretaceous birds. For the first time, high‐resolution computed laminographic and computed tomographic scans were used to reconstruct the gastral mass in two species of non‐neornithine ornithuromorph birds from the Lower Cretaceous Jehol Group. Four specimens of each taxon were analysed. Preservation of the gastral mass in most of these specimens is in situ and regarded as complete or nearly so. The number of gastroliths, their total volume, and their total mass relative to the estimated body mass were calculated for each specimen. The resultant gastral mass to body mass ratios fall within the range observed in extant birds, supporting previous inferences that the digestive system in non‐neornithine ornithuromorphs was comparable to that of extant taxa. Compared to available data for non‐volant non‐avian theropods, the gastral mass is proportionately smaller in birds suggesting that the evolution of flight constrained gastral mass size in the theropod lineage. Currently available data on gastral mass characteristics suggests that Iteravis ate larger food particles compared to Archaeorhynchus but cannot be used to determine diet more precisely. Better understanding of the relationship between gastral mass characteristics and food items across a broader range of extant taxa may provide an indirect but important method through which to infer diet and digestive function in archosaurs.

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Effect of dietary magnesium, calcium, phosphorus, and limestone grain size on productive performance and eggshell quality of hens

Cited by 10 publications

References 30 publications

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

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

Differences in oviposition and egg quality of various genotypes of laying hens

Quantifying the gastral mass in Early Cretaceous ornithuromorphs (Aves, Ornithothoraces) from the Jehol avifauna

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