scholarly journals Dietary Interaction of 1,4-Diaminobutane (Putrescine) and Calcium on Eggshell Quality and Performance in Laying Hens

2002 ◽  
Vol 81 (1) ◽  
pp. 84-91 ◽  
Author(s):  
Chowdhury ◽  
T.K. Smith
Keyword(s):  
Laying Hens ◽  
Eggshell Quality ◽  
Dietary Interaction ◽  
And Performance

scholarly journals Prolonged scotophase within a 24-h light regime improves eggshell quality by enhancing calcium deposition in laying hens

2021 ◽  
pp. 101098
Author(s):  
Qian Xin ◽  
Minghui Wang ◽  
Hongchao Jiao ◽  
Jingpeng Zhao ◽  
Haifang Li ◽  
...  
Keyword(s):  
Laying Hens ◽  
Light Regime ◽  
Calcium Deposition ◽  
Eggshell Quality

scholarly journals Bayesian inference of genetic parameters for reproductive and performance traits in White Leghorn hens

2018 ◽  
Vol 63 (No. 6) ◽  
pp. 230-236 ◽  
Author(s):  
J.O. Rosa ◽  
G.C. Venturini ◽  
T.C.S. Chud ◽  
B.C. Pires ◽  
M.E. Buzanskas ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Fixed Effects ◽  
Egg Production ◽  
Genetic Parameters ◽  
Laying Hens ◽  
Reproductive Traits ◽  
A Posteriori ◽  
White Leghorn ◽  
Performance Traits ◽  
And Performance

This study estimated the genetic parameters for reproductive and performance traits and determined which ones can be used as selection criteria for egg production in laying hens using the Bayesian inference. The data of 1894 animals from three generations of White Leghorn laying hens were analyzed for fertility (FERT), hatchability (HATC), and birth rate measurements at 60 weeks of age (BIRTH), body weight at 16 and 60 weeks of age (BW16 and BW60), age at sexual maturity (ASM), egg height/width ratio, weight, and density at 28, 36, and 40 weeks of age (RHW28, RHW36, RHW40, WEGG28, WEGG36, WEGG40, DENS28, DENS36, and DENS40, respectively) traits. The genetic parameters were estimated by the Bayesian inference method of multi-trait animal model. The model included the additive and residual genetic random effects and the fixed effects of generation. The a posteriori mean distributions of the heritability estimates for reproductive traits ranged from 0.14 ± 0.003 (HATC) to 0.22 ± 0.005 (FERT) and performance from 0.07 ± 0.001 (RHW28) to 0.42 ± 0.001 (WEGG40). The a posteriori mean distributions of the genetic correlation between reproductive traits ranged from 0.18 ± 0.026 (FERT and HACT) to 0.79 ± 0.007 (FERT and BIRTH) and those related to performance ranged from –0.49 ± 0.001 (WEGG36 and DENS36) to 0.75 ± 0.003 (DENS28 and DENS36). Reproductive and performance traits showed enough additive genetic variability to respond to selection, except for RHW28. This trait alone would have little impact on the genetic gain because environmental factors would have a higher impact compared to those from the additive genetic factors. Based on the results of this study, the selection applied on the BIRTH trait can be indicated to improve FERT and HATC of eggs. Furthermore, the use of the WEGG40 could improve egg quality in this population.

scholarly journals Prolonged Dark Time Within A 24-h Light Regime Improves Eggshell Quality by Enhancing Calcium Deposition in Laying Hens

2020 ◽  
Author(s):  
Qian Xin ◽  
Jingpeng Zhao ◽  
Hongchao Jiao ◽  
Haifang Li ◽  
Xiaojuan Wang ◽  
...  
Keyword(s):  
Feed Efficiency ◽  
Egg Production ◽  
Laying Hens ◽  
Light Regime ◽  
Calcium Deposition ◽  
Eggshell Quality ◽  
Dark Time ◽  
Calbindin D28k ◽  
Calcium And Phosphorus ◽  
Calcium Transporter

Abstract Background: The absorption and transportation of calcium and phosphorus is mainly relied on their corresponding transporters. Eggshell is mainly formed during dark time in one egg cycle. The aim of this study was to determine the effect of different light regime on eggshell quality and the expression of the relevant calcium and phosphorus transporters in laying hens. Seventy two 56-week-old laying hens were randomly divided into two groups and subjected to the following treatments: 16 h light: 8 h dark (control) and 9 h light: 15 h dark (LDP). The expression of phosphorus transporters type IIb Na/Pi co-transporter NaPi-IIa (NPt2a) and NaPi-IIb (NPt2b), calcium transporter calbindin-D28k (CaBP-D28k), and plasma membrane Ca ATPase 1b (PMCA1b) were measured in small intestine, kidney, and eggshell gland. Results: The results showed that the feed intake (P < 0.001) and egg weight (P = 0.05) was decreased by LDP treatment, while laying rate, egg production, and feed efficiency were not significantly influenced (P > 0.05). Compared to control, eggshell hardness was increased (P < 0.05) by LDP treatment whereas eggshell thickness and eggshell percentage were not significant changed. Eggshell calcium (Ca) and phosphorus (P) contents were elevated in LDP-hens, compared to control birds. Compared to control birds, serum Ca (P < 0.01) and P levels (P = 0.079) at dark time were increased in LDP-hens while and alkaline phosphatase (ALP) activity was lowered (P < 0.05). The protein expression levels of CaBP-D28k and PMCA1b were not influenced in duodenum but were decreased at light time in jejunum of LDP hens. In kidney, the expression of CaBP-D28k, PMCA1b and NPt2a were not changed by LDP treatment. In eggshell gland, however, the expression of CaBP-D28k and osteopontin (OPN) were relative higher in LDP hens compared to control birds, whereas the PMCA1b expression was not altered. Conclusions: The result indicates that the increased circulating Ca and P concentrations in dark time are favorable for the deposition of calcium and phosphorus in eggshell. The result offers an alternative strategy for the laying hen with a worse eggshell problem.

scholarly journals Effects of Feed Supplementations for Fermented Apple Pomace and Cinnamon on Egg Quality and Performance in Laying Hens

2010 ◽  
Vol 37 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Hwan-Ku Kang ◽  
Ok-Suk Seo ◽  
Hee-Chul Choi ◽  
Hyun-Seok Chae ◽  
Jae-Cheon Na ◽  
...  
Keyword(s):  
Laying Hens ◽  
Egg Quality ◽  
Apple Pomace ◽  
And Performance

scholarly journals Effects of Caffeine on Egg Quality and Performance of Laying Hens

2020 ◽  
Vol 7 ◽  
Author(s):  
Mailson da Silva Teixeira ◽  
Marcela Viana Triginelli ◽  
Thaís de Ataíde Costa ◽  
Leonardo José Camargos Lara ◽  
Benito Soto-Blanco
Keyword(s):  
Laying Hens ◽  
Egg Quality ◽  
And Performance

scholarly journals The effects of space allowance on egg yield, egg quality and plumage condition of laying hens in battery cages

2008 ◽  
Vol 53 (No. 8) ◽  
pp. 345-353 ◽  
Author(s):  
M. Sarica ◽  
S. Boga ◽  
U.S. Yamak
Keyword(s):  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Stocking Density ◽  
Experimental Period ◽  
Egg Mass ◽  
Quality Traits ◽  
Body Parts ◽  
Battery Cages ◽  
And Performance

This study was conducted to investigate the effects of cage stocking density on egg yield, some egg quality traits and plumage condition in laying hens. Eighteen weeks-old 264 ISA-Brown pullets were divided into four cage density groups. The densities were 2 000, 1 000, 667 and 500 cm<sup>2</sup> per hen (by allocating 1, 2, 3 and 4 hens per cage; floor area 40 × 50 cm) with 48, 30, 24 and 21 replicate cages, totally 123 three-tier battery cages. During the experimental period from 18 to 53 weeks of age, all birds were provided illumination for 16 hours a day. The hens were fed a diet containing 11.7 MJ ME/kg and 180 g CP during the period of 18 to 40 weeks of age and 11.3 MJ ME/kg and 170 g CP during the period of 41 to 54 weeks of age. Feed and water were available for <I>ad libitum</I>. Egg yield, mortality, live weights at 50% egg production age and at the end of experiment, pecking related mortalities, some egg quality traits and plumage condition were recorded weekly. Hen-housed egg production, egg mass, viability, and live weights were significantly decreased by higher densities. Most of the egg quality traits were not affected by cage densities. Pecking related mortalities increased in cage densities of 667 cm<sup>2</sup> and 500 cm<sup>2</sup> per hen compared to the other densities (<I>P</I> < 0.05) while plumage scores were higher in all body parts of hens kept in cages of 2 000 cm<sup>2</sup> and 1 000 cm<sup>2</sup> densities compared to the higher densities. The results showed that brown laying hens should be kept in cages having 1 000–2 000 cm<sup>2</sup> densities in order to improve their welfare and performance.

scholarly journals Eggshell characteristics and cuticle deposition in three laying hen genotypes housed in enriched cages and on litter

2017 ◽  
Vol 63 (No. 1) ◽  
pp. 11-16 ◽  
Author(s):  
M. Ketta ◽  
E. Tumova
Keyword(s):  
Laying Hens ◽  
Quality Parameters ◽  
Laying Hen ◽  
Housing System ◽  
Eggshell Thickness ◽  
System Effect ◽  
Egg Weight ◽  
Housing Systems ◽  
Eggshell Quality ◽  
System P

The objective of the present study was to compare the eggshell characteristics and cuticle deposition of Lohmann Brown, Hy-Line Silver Brown, and Isa Brown layers kept in two different housing systems. The three laying hen genotypes were housed in enriched cages (100 hens, 750 cm<sup>2</sup>/hen, 10 hens/cage) and in littered pens (100 hens, 9 hens/m<sup>2</sup>, 10 hens/pen). The experiment was carried out in weeks 40–56 of hens age. Non-significant interactions of genotype and housing system for eggshell quality parameters and cuticle deposition were detected in this study. Egg weight was significantly affected by genotype (P ≤ 0.001) and housing system (P ≤ 0.043). The heaviest eggs were laid by Lohmann Brown, while the lightest eggs were produced by Hy-Line Silver Brown. Eggshell strength was not affected by genotype and housing system, however, genotype had a significant effect on eggshell thickness (P ≤ 0.033). Isa Brown eggs had thicker eggshells compared to Lohmann Brown and Hy-Line Silver Brown. However, a non-significant effect of housing system on eggshell thickness was observed. Eggshell percentage was significantly affected by both genotype and housing system. Genotype of laying hens had a significant effect on cuticle deposition; significantly higher cuticle deposition was observed in Lohmann Brown eggs (P ≤ 0.001). It could be concluded that genotype had a significant effect on eggshell quality parameters and cuticle deposition. However, the housing system effect was less important in these characteristics.

scholarly journals Effects of Dimethyl Anthranilate-Based Repellents on Behavior, Plumage Condition, Egg Quality, and Performance in Laying Hens

2020 ◽  
Vol 7 ◽  
Author(s):  
Dušan Terčič ◽  
Mojca Pančur ◽  
Dušanka Jordan ◽  
Manja Zupan Šemrov
Keyword(s):  
Laying Hens ◽  
Egg Quality ◽  
And Performance

Providing laying hens in group-housed enriched cages with access to barley silage reduces aggressive and feather-pecking behaviour

2016 ◽  
Vol 96 (2) ◽  
pp. 161-171 ◽  
Author(s):  
S.G. Johannson ◽  
C. Raginski ◽  
K. Schwean-Lardner ◽  
H.L. Classen
Keyword(s):  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Free Access ◽  
Feather Pecking ◽  
Nest Boxes ◽  
And Performance ◽  
Barley Silage ◽  
Effect Of Feeding ◽  
Bird Weight

Two trials were conducted to study the effect of feeding barley silage on the behaviour and performance of beak-trimmed laying hens. In each trial, 20 hens and 2 roosters were housed in each of eight group-housed enriched cages, with four cages provided a laying hen diet and four cages additionally given free access to barley silage. Egg production and quality, and hen behaviour were assessed throughout the trials (Trial One 20–30 weeks; Trial Two 19–28 weeks). Data were analysed using Proc Mixed of SAS 9.4 and differences were significant when P ≤ 0.05. Silage-fed hens consumed 41 (13.9 g DM) and 50 (13.5 g DM) grams of silage per hen per day in Trials One and Two, respectively, while consuming less layer diet. Birds fed silage spent less time expressing aggressive and feather-pecking behaviours and in nest boxes, and more time feeding than control birds. Egg production, egg quality, and bird weight were not affected by treatment; yolk colour was darker for the silage treatment. Feathering quality was improved in silage-fed birds compared to control birds. It was concluded that providing hens with access to barley silage can improve welfare indicators without negatively affecting the egg production and egg quality.

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