Guinea fowl (Numida meleagris) eggs and free-range housing: a convenient alternative to laying hens' eggs in terms of food safety?

Krunt, Ondřej; Zita, Lukáš; Kraus, Adam; Okrouhlá, Monika; Chodová, Darina; Stupka, Roman

doi:10.1016/j.psj.2021.01.029

Cited by 10 publications

(11 citation statements)

References 46 publications

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“…The welfare of laying hens is an important topic, not only among scientists, but also among non-expert communities. The type of housing is a main concern, where the trend has been to follow alternative or different methods than cage housing [ 1 ]. Emphasis is also placed on the quality of production, specifically on the quality of eggs, which are an integral part of the human diet.…”

Section: Introductionmentioning

confidence: 99%

Changes in Fatty Acids Profile, Health Indices, and Physical Characteristics of Organic Eggs from Laying Hens at the Beginning of the First and Second Laying Cycles

Zita

Okrouhlá

Krunt

et al. 2022

Animals

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The present study compared the fatty acid profile and some physical parameters of eggs from hens reared according to the organic system at the beginning of the first and second laying cycle. A total of 1080 eggs were analysed at the beginning of the first (from the 28th to 30th week of age) and the second (from the 78th to 80th week of age) laying cycle. It was found that the hen ages influenced the egg weight, egg surface area, yolk proportion, and eggshell colour. Albumen and eggshell proportion, albumen, yolk index, Haugh unit score, and eggshell strength were lower in eggs from older hens compared with those produced from younger layers. Monounsaturated fatty acids were found in higher amounts than saturated fatty acids and polyunsaturated fatty acids in egg yolks of eggs from layers only at the beginning of the second laying cycle. The PUFAn-6/n-3 ratio, saturation, atherogenic, and thrombogenic indices were significantly lower in the egg yolks from older hens compared to younger layers. These findings (regarding the eggs from the older ones) prove that it is practical to utilize them in the organic farming system during a period of two years.

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Section: Introductionmentioning

confidence: 99%

Changes in Fatty Acids Profile, Health Indices, and Physical Characteristics of Organic Eggs from Laying Hens at the Beginning of the First and Second Laying Cycles

Zita

Okrouhlá

Krunt

et al. 2022

Animals

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“…The microbiological analysis was made according to Krunt et al (2021) and included the counting of colonies forming units (CFU) of Escherichia coli (EC), Enterococcus (ENT) and a total number of microorganisms (TNM). The determination of microbiological contamination was made from the eggshell surface, eggshell membranes and thin albumen.…”

Section: Microbiological Analysismentioning

confidence: 99%

“…Storage conditions including method, time and temperature, play a considerable role as well (Svobodová and Tůmová, 2014;Brodacki et al (2019). Number of authors, such as Jones et al (2004), Vlčková et al (2018) and Krunt et al (2021) studied the effect of storage conditions on microbiological contamination. Jones et al (2004) determined the effect of genotype and storage time, Vlčková et al (2018) the effect of storage time, housing system and age of hens and Krunt et al (2021) the effect of storage time, storage temperature and genotype.…”

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confidence: 99%

“…Number of authors, such as Jones et al (2004), Vlčková et al (2018) and Krunt et al (2021) studied the effect of storage conditions on microbiological contamination. Jones et al (2004) determined the effect of genotype and storage time, Vlčková et al (2018) the effect of storage time, housing system and age of hens and Krunt et al (2021) the effect of storage time, storage temperature and genotype. As mentioned above, some environmental factors have an impact on the contamination of eggs, so the avians have throughout the years adapted and developed several mechanisms, such as behavioural, chemical and physiological, to fight with the infection.…”

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confidence: 99%

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Do the differences in egg contamination, penetration, and resistance against microorganisms among the hen genotypes exist?

Kraus

Zita

Krunt

et al. 2022

Annals of Animal Science

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The aim of this study was to evaluate and compare the impact of genotype and storage conditions (temperature and time) on microbiological contamination and eggshell quality. There were four genotypes of laying hens used, Czech golden spotted (CGS), Greenleg Partridge (GP), White Leghorn (WL) and commercial hybrid (CH) hens were included. After collection, the eggs were divided equally into five groups regarding the storage time (0, 14, 28 days) and temperature (5 and 20 °C). The microbiological analysis included counting of colonies forming units (CFU) of Escherichia coli (EC), Enterococcus (ENT) and total number of microorganisms (TNM) on eggshell surface, eggshell membranes and in thin albumen. The analysis of eggshell quality included the determination of eggshell proportion (SP), thickness (ST), strength (SST), index (SI) and surface (SS). Moreover, egg weight (EW) and egg weight loss (EWL) were determined. The significant effect of genotype was found in contamination of eggshell by EC, ENT and TNM, eggshell membranes by TNM and albumen by EC (all P ≤ 0.05). The significantly lowest contamination of eggshell from EC was in eggs from the WL hens (4.42 log CFU/eggshell), while from ENT was in eggs from the CGS hens (1.22 log CFU/eggshell) and from the WL hens (1.40 log CFU/eggshell). The lowest incidence of TNM was also detected in eggs from the WL hens (5.03 log CFU/eggshell). Statistically the lowest contamination of eggshell membranes by TNM was found in eggs from the WL (0.12 log CFU/eggshell membranes) and CH hens (0.15 log CFU/eggshell membranes). Regarding the effect of genotype, the GP (not detected) and WL (not detected) hens was in eggs with statistically the lowest occurrence of EC bacteria in albumen. Regarding the EW and eggshell quality, all the parameters were significantly affected by the genotype (P ≤ 0.0001). Also EWL was significantly (P ≤ 0.05) affected by genotype (after 14, 21 and 28 days of storage). There were found to be significant differences of microbial contamination of egg surface among observed hen genotypes. The penetration of selected microorganisms was also significant in contamination of eggshell membranes by TNM and in contamination of albumen by EC.

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“…Recently, it has been demonstrated that the supplementation of a commercial multistrain probiotic (Slab51 ® , administered in drinking water, 2 × 10 11 UFC/L) positively affects the morphology and microbiota diversity of guineafowl (Numida meleagris) intestine [18],and this species has been indicated as a suitable alternative to laying hens due to their higher resistance to diseases, ability of adaptation to different environmental conditions and in terms of eggshell quality and therefore egg safety [19]. Considering that Slab51 ® induces changes in the carbohydrate composition of glycans secreted along intestinal tracts of mammals [20,21], we aimed to evaluate the effect of the aforementioned probiotics on the glycan composition of glycoproteins produced in the intestine, with particular attention to the goblet cells mucins, of guineafowl.…”

Section: Introductionmentioning

confidence: 99%

Modulation of Morphology and Glycan Composition of Mucins in Farmed Guinea Fowl (Numida meleagris) Intestine by the Multi-Strain Probiotic Slab51®

Desantis

Galosi

Santamaría

et al. 2021

Animals

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Probiotics have become highly recognized as supplements for poultry.Since gut health can be considered synonymous withanimal health, the effects of probiotic Slab51® on the morphology and the glycan composition of guineafowlintestine were examined. The probiotics were added in drinking water (2 × 1011 UFC/L) throughout the grow-out cycle.Birds were individually weighed andslaughtered after four months. Samples from the duodenum, ileum and caecum were collected and processed for morphological, morphometric, conventional and lectin glycohistochemical studies.The results were analyzed for statistical significance by Student’s t test. Compared with control samples, probiotic group revealed (1) significant increase in villus height (p < 0.001 in duodenum and ileum; p < 0.05 in caecum), crypt depth (p < 0.001 in duodenum and caecum;p < 0.05 in ileum) and goblet cells (GCs) per villus (p < 0.001) in all investigated tracts; (2) increase in galactoseβl,3N-acetylgalacyosamine(Galβl,3GalNAc)terminating O-glycans and αl,2-fucosylated glycans secretory GCs in the duodenum; (3) increase in α2,6-sialoglycans and high-mannose N-linked glycans secretory GCs but reduction in GCs-secreting sulfoglycans in the ileum; (4) increase in Galβl,3GalNAc and high-mannose N-linked glycans secretory GCs and decrease in GCs-producing sulfomucins in the caecum; (5) increase in the numbers of crypt cells containing sulfate and non-sulfated acidic glycans. Overall, dietary Slab51® induces morphological and region-specific changes in glycoprotein composition of guinea fowl intestine, promoting gut health.

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Guinea fowl (Numida meleagris) eggs and free-range housing: a convenient alternative to laying hens' eggs in terms of food safety?

Cited by 10 publications

References 46 publications

Changes in Fatty Acids Profile, Health Indices, and Physical Characteristics of Organic Eggs from Laying Hens at the Beginning of the First and Second Laying Cycles

Changes in Fatty Acids Profile, Health Indices, and Physical Characteristics of Organic Eggs from Laying Hens at the Beginning of the First and Second Laying Cycles

Do the differences in egg contamination, penetration, and resistance against microorganisms among the hen genotypes exist?

Modulation of Morphology and Glycan Composition of Mucins in Farmed Guinea Fowl (Numida meleagris) Intestine by the Multi-Strain Probiotic Slab51®

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