Shifts in eggshell thickness are related to changes in locomotor ecology in dinosaurs

Evolution ◽  
2021 ◽  
Author(s):  
Lucas J. Legendre ◽  
Julia A. Clarke
Keyword(s):  
Eggshell Thickness

scholarly journals Effect of selected feed additives on egg performance and eggshell quality in laying hens fed a diet with standard or decreased calcium content

2018 ◽  
Vol 18 (1) ◽  
pp. 167-183 ◽  
Author(s):  
Sylwester Świątkiewicz ◽  
Anna Arczewska-Włosek ◽  
Józefa Krawczyk ◽  
Witold Szczurek ◽  
Michał Puchała ◽  
...  
Keyword(s):  
Breaking Strength ◽  
Calcium Content ◽  
Egg Yolk ◽  
Feed Additives ◽  
Cholesterol Concentration ◽  
Eggshell Thickness ◽  
Performance Indices ◽  
Eggshell Quality ◽  
Laying Performance ◽  
Herb Extracts

Abstract The aim of the experiment with 240 ISA Brown hens fed the diets with standard or decreased Ca level was to evaluate the effect of selected feed additives on laying performance and eggshell quality. The hens were allocated to 10 treatments, each containing 12 cages (replicates) of 2 birds. A 2 × 5 experimental arrangement was used. From 26 to 70 wks of age, experimental diets containing 3.20 or 3.70% Ca were used. The diets were either not supplemented, or supplemented with sodium butyrate, probiotic bacteria, herb extracts blend or chitosan. The decreased dietary Ca reduced eggshell quality indices in older hens (43-69 wks) (P<0.05) without effect on performance indices. The addition of the probiotic, herb extracts, or chitosan increased the laying rate (P<0.05). In older hens, i.e. at 69 wk, chitosan increased eggshell thickness and breaking strength, while herb extracts increased eggshell thickness (P<0.05). There was no interaction between the experimental factors in performance and eggshell quality. The used feed additives had no influence on fatty acid profile of egg lipids, however diet supplementation with chitosan decreased cholesterol concentration in egg yolk lipids (P<0.05). It can be concluded that such feed additives as probiotic, herb extracts, or chitosan may positively affect performance and eggshell quality, irrespective of Ca dietary level.

scholarly journals The Effect of Age and Genotype on Quality of Eggs in Brown Egg‑Laying Hybrids

2019 ◽  
Vol 67 (2) ◽  
pp. 407-414 ◽  
Author(s):  
Adam Kraus ◽  
Lukáš Zita
Keyword(s):  
Laying Hens ◽  
Egg Quality ◽  
Shape Index ◽  
Egg Laying ◽  
Average Weight ◽  
Eggshell Thickness ◽  
External Quality ◽  
Technological Value ◽  
Effect Of Age

The aim was to assess the internal and external quality of consumer eggs of egg‑laying hens of two selected genotypes depending on their age. All of these hens were kept in enriched cages. There were compared eggs from Hy‑Line Brown and ISA Brown hens at the age from 36 to 64 weeks. In total, 3840 eggs from 300 hens were evaluated. Quality of eggs was determined by their technological value. Statistically significant interactions (P = 0.001) between age and genotype were found in all evaluated parameters except for the yolk colour (P = 0.044), whereas there was not found interaction (P = 0.072) between age and genotype in eggshell strength. The significant effect of hens’ age was found in all evaluated parameters, with the only exception of the yolk colour. The results showed that the average weight of eggs, eggshell, albumen and yolk increased with the age. Also the eggshell proportion, its colour and yolk index values ​​increased, whereas the egg shape index, eggshell thickness and strength, albumen proportion, Haugh units, the albumen and the yolk index decreased. Statistically significant effect of the genotype was found in all evaluated parameters except for the yolk index. When comparing both genotypes, the eggs from ISA Brown hens had a better quality. The trend of deteriorating egg quality with age was confirmed.

scholarly journals PENGARUH PROBIOTIK DAN EKSTRAK DAUN KATUK (Sauropus androgynous) TERHADAP TEBAL KERABANG DAN HAUGH UNIT (HU) PUYUH PETELUR (Effect Of Probiotic and Sauropus androgynous Leaf Extract on Eggshell Thickness and Haugh Unit (HU) in Laying Quail)

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Novia Rahayu ◽  
Dwi Wijayanti ◽  
Nurul Frasiska
Keyword(s):  
Shell Thickness ◽  
Leaf Extract ◽  
Egg Quality ◽  
Quality Standards ◽  
Bacillus Sp ◽  
Eggshell Thickness ◽  
Treatment Groups ◽  
Probiotic Treatment ◽  
Egg Shell ◽  
Haugh Unit

Abstrak Penelitian bertujuan untuk mengetahui pengaruh pemberian ekstrak daun katuk (Sauropus androgynous) dalam ransum terhadap tebal kerabang dan haugh unit (HU). Enam puluh ekor puyuh petelur fase produksi dibagi menjadi 4 kelompok perlakuan : 1) T0 : ransum tanpa perlakuan, 2) T1 : ransum dengan perlakuan ekstrak daun katuk 3.5g/kg ransum, 3) T2 : ransum dengan perlakuan probiotik (Bacillus sp. dan Saccharomycess sp.), 4) T3 : ransum dengan perlakuan ekstrak daun katuk 3.5g/kg ransum + probiotik (Bacillus sp. dan Saccharomycess sp.). Hasil penelitian menunjukkan bahwa perlakuan tidak berpengaruh nyata terhadap tebal kerabang (P>0.05) dan haugh unit (HU) (P>0.05). Telur hasil penelitian dari semua perlakuan menunjukkan kondisi telur yang sesuai dengan standar kualitas tebal kerabang dan haugh unit (HU). ¬Kata Kunci : Ekstrak daun katuk, haugh unit, probiotik, puyuh, tebal kerabang Abstract The study aims to determine the effect of giving sauropus androgynous leaf extract in the ration on egg quality. Sixty quails laying in the production phase were divided into 4 treatment groups: 1) T0: rations without treatment, 2) T1 : rations with katuk leaf extract treatment 3.5g / kg ration, 3) T2 : rations with probiotic treatment (Bacillus sp. And Saccharomycess sp.), 4) T3 : ration with katuk leaf extract treatment 3.5g / kg ration + probiotics (Bacillus sp. and Saccharomycess sp.). The results showed that the treatment had no significant effect on egg shell thickness (P>0.05) and haugh unit (HU) (P>0.05). Eggs from all treatments showed the condition of eggs in accordance with the quality standards of the thickness of the shells and haugh units (HU). Keywords: Eggshell thickness, haugh unit, probiotics, quail, sauropus androgynous leaf extract

Effects of environmental conditions on the egg mass, yolk antioxidant level, eggshell thickness and eggshell spotting patterns of Great Tits (Parus major)

2016 ◽  
Vol 157 (4) ◽  
pp. 995-1006 ◽  
Author(s):  
Rita Hargitai ◽  
Márton Herényi ◽  
Gergely Nagy ◽  
Zoltán Nyiri ◽  
Zsuzsanna Eke ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Parus Major ◽  
Egg Mass ◽  
Eggshell Thickness

Weak Correlation between Eggshell Thickness and Breaking Strength in Japanese Quail Suggests a need for Separate Assessment

2009 ◽  
Vol 2 (4) ◽  
pp. 235-239
Author(s):  
Lars Niemann ◽  
Christine Gericke ◽  
Konstanze Grote ◽  
Ibrahim Chahoud
Keyword(s):  
Japanese Quail ◽  
Breaking Strength ◽  
Eggshell Thickness ◽  
Weak Correlation

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 Different Dietary Calcium Levels on the Performance, Egg Quality, and Albumen Transparency of Laying Pigeons

Animals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 110 ◽  
Author(s):  
Lingling Chang ◽  
Rui Zhang ◽  
Shengyong Fu ◽  
Chunyu Mu ◽  
Qingping Tang ◽  
...  
Keyword(s):  
Egg Quality ◽  
Optimal Level ◽  
Dietary Calcium ◽  
Production Performance ◽  
Eggshell Thickness ◽  
Egg Weight ◽  
Assessment Index ◽  
Treatment Groups ◽  
Egg Ratio ◽  
Haugh Unit

In order to confirm the dietary calcium (Ca) requirement to keep a balance of the production performance and the albumen transparency, the study examined the effects of different dietary Ca levels on the production performance, egg quality, and albumen transparency of laying pigeons. 1080 pigeon pairs were randomly allocated into six treatment groups, each consisting of six replicates of 30 pigeon pairs per treatment. Ca levels of 0.60, 0.90, 1.20, 1.80, 2.40, and 3.00% were fed. The results showed that the laying rate, average egg weight, and feed to egg ratio were significantly influenced by Ca levels (p < 0.05). Albumen percentage, albumen height, Haugh unit, and eggshell thickness at 8 w and 16 w were significantly influenced by Ca levels (p < 0.05). The L*, a*, b*, and c* values of cooked albumen at 8 w and 16 w were all significantly influenced by Ca levels (p < 0.05). After 16 w of feeding different Ca levels, the percentage of transparent eggs had an early increasing and later decreasing trend. In conclusion, taking the transparency of pigeon eggs as an assessment index and considering production performance secondly, the optimal level of dietary Ca for laying White King pigeons is 0.90%.

scholarly journals Correlates of eggshell thickness

2010 ◽  
Vol 16 (2) ◽  
Author(s):  
O.E Okereke ◽  
E.C Nwogu
Keyword(s):  
Eggshell Thickness

Eggshell Thickness Changes in Pacific Ocean Phaethontidae and Sulidae

The Condor ◽  
1979 ◽  
Vol 81 (2) ◽  
pp. 209 ◽  
Author(s):  
Michael L. Morrison
Keyword(s):  
Pacific Ocean ◽  
Eggshell Thickness
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