scholarly journals Transfer of enrofloxacin, ciprofloxacin and lincomycin into eggshells and residue depletion in egg components after multiple oral administration to laying hens

2021 ◽  
pp. 101341
Author(s):  
Małgorzata Gbylik-Sikorska ◽  
Beata Łebkowska-Wieruszewska ◽  
Anna Gajda ◽  
Ewelina Nowacka-Kozak ◽  
Andrzej Lisowski ◽  
...  
Keyword(s):  
Oral Administration ◽  
Laying Hens ◽  
Residue Depletion ◽  
Egg Components

Modelling the egg components and internal cycle length of laying hens

2019 ◽  
Vol 59 (3) ◽  
pp. 420 ◽  
Author(s):  
H. C. P. Bendezu ◽  
N. K. Sakomura ◽  
E. B. Malheiros ◽  
R. M. Gous ◽  
N. T. Ferreira ◽  
...  
Keyword(s):  
Cycle Length ◽  
Egg Production ◽  
Laying Hens ◽  
Experimental Period ◽  
Experimental Unit ◽  
Egg Weight ◽  
Cycle Lengths ◽  
Predicted Values ◽  
Egg Components ◽  
Over Time

A model that can estimate the changes that occur to the composition of egg components over time is an important tool for the nutritionists, since it can provide information about the nutrients required by a laying hen to achieve her potential egg output. In this context, the present study was aimed to model the potential egg production of laying hens during the egg-production period. One hundred and twenty Hy-Line W36 and ISA-Brown layers were used from 18 to 60 weeks of age, with each bird being an experimental unit. The birds were housed in individual cages during the experimental period. Egg production (%), egg weight (g) and the weight of egg components were recorded for each bird. The data were used to calculate the parameters of equations for predicting the weights of yolk, albumen and shell, and for predicting internal cycle length. The predicted results were evaluated by regressing residual (observed minus predicted) values of the predicted values centred of their average value. The equations for predicting mean yolk weight with age are for Hy-Line W36 (y1) and ISA-Brown (y2) respectively. Albumen and shell weights for Hy-Line W36 were described by the equations 15.07 × (yolk weight)0.37 and 0.70 × (yolk + albumen weight)0.50 respectively, and for ISA-Brown, 21.99 × (yolk weight)0.24 and 1.60 × (yolk + albumen weight)0.34 respectively. The average internal cycle length over time for Hy-Line W36 (ICL1) is described by the model 22.95 + 5.24 × (0.962t) + 0.02 × t and for ISA-Brown by 24.01 + 10.29 × (0.94t) + 0.004 × t, where t is the age at first egg (days). The assessment of the results indicated that the equations for predicting egg weight were more accurate for Hy-Line W36 but less precise for both strains, whereas the equation models for predicting the internal cycle lengths were more accurate and precise for ISA-Browns. The models could predict the potential weight of egg components and the rate of laying associated with the internal cycle lengths, and, on the basis of this information, it is possible to improve the nutrient requirement estimated.

Tissue Deposition and Residue Depletion in Laying Hens Exposed to Melamine-Contaminated Diets

2010 ◽  
Vol 58 (9) ◽  
pp. 5414-5420 ◽  
Author(s):  
Xue Bai ◽  
Fan Bai ◽  
Keying Zhang ◽  
Xiaowen Lv ◽  
Yuchang Qin ◽  
...  
Keyword(s):  
Laying Hens ◽  
Residue Depletion

scholarly journals Oral administration of pravastatin reduces egg cholesterol but not plasma cholesterol in laying hens

2004 ◽  
Vol 83 (9) ◽  
pp. 1539-1543 ◽  
Author(s):  
J.H. Kim ◽  
S.T. Hong ◽  
H.S. Lee ◽  
H.J. Kimt
Keyword(s):  
Oral Administration ◽  
Laying Hens ◽  
Plasma Cholesterol

scholarly journals Slight Disruption in Intestinal Environment by Dextran Sodium Sulfate Reduces Egg Yolk Size Through Disfunction of Ovarian Follicle Growth

2021 ◽  
Vol 11 ◽  
Author(s):  
Takahiro Nii ◽  
Takashi Bungo ◽  
Naoki Isobe ◽  
Yukinori Yoshimura
Keyword(s):  
Gene Expression ◽  
Oral Administration ◽  
Blood Plasma ◽  
Sodium Sulfate ◽  
Egg Production ◽  
Laying Hens ◽  
Ovarian Follicle ◽  
Egg Yolk ◽  
Dextran Sodium Sulfate ◽  
Intestinal Environment

Intestinal environments such as microbiota, mucosal barrier function, and cytokine production affect egg production in laying hens. Dextran sodium sulfate (DSS) is an agent that disrupts the intestinal environment. Previously, we reported that the oral administration of dextran sodium sulfate (DSS: 0.9 g/kg BW) for 5 days caused severe intestinal inflammation in laying hens. However, the DSS concentration in the previous study was much higher to induce a milder disruption of the intestinal environment without heavy symptoms. Thus, the goal of this study was to determine the effects of a lower dose of DSS on the intestinal environment and egg production in laying hens. White Leghorn laying hens (330-day old) were oral administered with or without 0.225 g DSS/kg BW for 28 days (DSS and control group: n = 7 and 8, respectively). Weekly we collected all laid eggs and blood plasma samples. Intestinal tissues, liver, ovarian follicles, and the anterior pituitary gland were collected 1 day after the final treatment. Lower concentrations of orally administered DSS caused (1) a decrease in the ratio of villus height/crypt depth, occludin gene expressions in large intestine and cecal microbiota diversity, (2) a decrease in egg yolk weight, (3) an increase in VLDLy in blood plasma, (4), and enhanced the egg yolk precursor accumulation in the gene expression pattern in the follicular granulosa layer, (5) an increase in FSH and IL-1β gene expression in the pituitary gland, and (6) an increase in concentration of plasma lipopolysaccharide binding protein. These results suggested that the administration of the lower concentration of DSS caused a slight disruption in the intestinal environment. This disruption included poor intestinal morphology and decreased cecal microbiome diversity. The change in the intestinal environment decreases egg yolk size without decreasing the VLDLy supply from the liver. The decrease in egg yolk size is likely to be caused by the dysfunction of egg-yolk precursor uptake in ovarian follicles. In conclusion, the oral administration of a lower dose of DSS is an useful method to cause slight disruptions of intestinal environment, and the intestinal condition decreases egg yolk size through disfunction of ovarian follicle.

Estimation of the Withdrawal Time of Levamisole in Eggs after Oral Administration to Laying Hens

2018 ◽  
Vol 81 (10) ◽  
pp. 1627-1634 ◽  
Author(s):  
BOŽICA SOLOMUN KOLANOVIĆ ◽  
NINA BILANDŽIĆ ◽  
IVANA VARENINA ◽  
ĐURĐICA BOŽIĆ LUBURIĆ ◽  
INES VARGA ◽  
...  
Keyword(s):  
Body Weight ◽  
Standard Deviation ◽  
Oral Administration ◽  
Relative Standard Deviation ◽  
Laying Hens ◽  
Withdrawal Time ◽  
End Of Treatment ◽  
Relative Standard ◽  
Validation Parameters ◽  
Egg Yolks

ABSTRACT This study was conducted to evaluate withdrawal time of levamisole in eggs after oral administration in laying hens at different doses. Sampling of eggs was conducted for 37 days after the end of treatment, and levamisole concentrations were measured by liquid chromatography–tandem mass spectrometry validated according to the Commission Decision 2002/657/EC. Estimated validation parameters were as follows: decision limit, 0.54 μg/kg; detection capability, 0.56 μg/kg; limit of detection, 0.04 μg/kg; limit of quantification, 0.15 μg/kg; accuracy (recovery), between 92.9 and 102.3%; precision (relative standard deviation), ≤4.62%; and within-laboratory precision (relative standard deviation), ≤5.19%. Levamisole residue levels were significantly higher in egg yolks than in egg whites. The highest levels of levamisole were detected on day 2 posttreatment in groups receiving 50 mg/kg of body weight (556.2 μg/kg in egg yolks and 166.5 μg/kg in egg whites). Significant elimination occurred within 5 days after the cessation of treatment in all groups, with an elimination half-life of 1.3 days. Levamisole was still detectable on day 30 after the end of treatment in egg whites (0.06 μg/kg) and on day 37 in egg yolks (0.06 μg/kg). The longest withdrawal time for levamisole in eggs (14.9 days) was determined in a group treated with 25 mg of levamisole per kg of body weight for two consecutive days. According to the results, oral treatment of laying hens with levamisole may result in noncompliant egg samples even 14 days after treatment.

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

2017 ◽  
Vol 62 (No. 9) ◽  
pp. 377-383 ◽  
Author(s):  
E. Tůmová ◽  
J. Vlčková ◽  
D. Chodová
Keyword(s):  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Laying Hen ◽  
Sequence Length ◽  
Production Traits ◽  
Egg Weight ◽  
Egg Shell ◽  
Egg Components

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.

Incurred Arsenic Residues in Chicken Eggs

1994 ◽  
Vol 57 (3) ◽  
pp. 218-223 ◽  
Author(s):  
DAN J. DONOGHUE ◽  
HERMAN HAIRSTON ◽  
CAROL V. COPE ◽  
MARY J. BARTHOLOMEW ◽  
DAVID D. WAGNER
Keyword(s):  
Laying Hens ◽  
Dependent Manner ◽  
Refrigerated Storage ◽  
Withdrawal Period ◽  
Arsanilic Acid ◽  
Elemental Arsenic ◽  
Egg Components ◽  
Chicken Eggs ◽  
Dose Dependent ◽  
Whole Egg

Arsanilic acid and roxarsone were fed to laying hens at elemental arsenic concentrations of 14, 28, 56 or 112 ppm for 10 weeks followed by a 2-week withdrawal period. Arsenic residues in egg components of laying hens that were fed either control or diets treated with organic arsenicals were determined weekly by atomic absorption. Arsenic concentrations in eggs were also determined after either 0, 2 or 4 weeks of refrigerated storage (4°C). Arsenic residues in both yolk and albumen increased in a dose-dependent manner although the amount of arsenic was much higher (95% of total) in yolk. Arsenic concentrations increased within 1 week of treatment, and the highest amounts were obtained between the second and fourth week for yolk samples and by the first week for albumen samples, except in the 14-ppm doses where highest amounts were reached by the middle of the treatment period. Hens treated with 112 ppm arsenic from arsanilic acid produced eggs with arsenic residues exceeding the 500 ppb Food and Drug Administration whole egg tolerance level. Eggs subjected to refrigerated storage did not have increased arsenic concentrations in yolk, although, for a few treatments, residues increased in albumen.

Sulphamethazine residue depletion study in piglets after oral administration

2005 ◽  
Vol 529 (1-2) ◽  
pp. 325-329 ◽  
Author(s):  
E.P. Papapanagiotou ◽  
D.J. Fletouris ◽  
I.E. Psomas
Keyword(s):  
Oral Administration ◽  
Residue Depletion
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