نتایج جستجو برای: egg shell and egg membrane

تعداد نتایج: 16900131  

2014
E. Tůmová R. M. Gous N. Tyler

The aim of the study was to evaluate egg shell quality characteristics, mineral content in the egg shell, and serum mineral concentration during the egg formation process as influenced by oviposition time and ambient temperature at the beginning and end of the laying cycle in laying hens and broiler breeders. Egg shell quality deteriorated significantly at the higher temperature and was lower i...

Journal: :Anais da Academia Brasileira de Ciencias 2013
Qiang Wang Xiaolin Wang Zikui Zhao Jialiang Zhang Shunxing Jiang

A new type of turtle egg fossil was established: Emydoolithus laiyangensis oogen. et oosp. nov.. Based on its elliptical morphological shape, rigid eggshells, and eggshell characteristics, it is different from other types of round chelonian egg fossils. It is the second chelonian egg fossil found in Cretaceous in China. This discovery shows the Laiyang ecosystem in Late Cretaceous is more diver...

2009
F. H. de Witt

A study was conducted to determine the influence of different particle size limestone in layer diets on egg production and eggshell quality during the later stages of egg production (>54 weeks of age). Calcitic limestone (360 g Ca/kg), consisting of small (<1.0 mm), medium (1.0 2.0 mm) and large (2.0 3.8 mm) particles were obtained from a specific South African source that is extensively used i...

Journal: :Nature communications 2010
Gerald Grellet-Tinner Lucas E Fiorelli

Although several late Cretaceous sauropod colonial nesting sites have been discovered nearly on every continent during the last few decades, no studies have been performed to determine the factors that underpinned the choice of these specific sites. Here, we report the first definitive evidence of a group of sauropods that nested repetitively and purposely at a Cretaceous hydrothermal site at S...

2016
Gifford Miller John Magee Mike Smith Nigel Spooner Alexander Baynes Scott Lehman Marilyn Fogel Harvey Johnston Doug Williams Peter Clark Christopher Florian Richard Holst Stephen DeVogel

Although the temporal overlap between human dispersal across Australia and the disappearance of its largest animals is well established, the lack of unambiguous evidence for human-megafauna interactions has led some to question a human role in megafaunal extinction. Here we show that diagnostic burn patterns on eggshell fragments of the megafaunal bird Genyornis newtoni, found at >200 sites acr...

Journal: :Gene expression patterns : GEP 2003
Karen E James Celeste A Berg

A central question in biology is how developmental mechanisms are altered to bring about morphological evolution. Drosophilids boast a remarkable diversity in eggshell-appendage number-from as few as one to as many as nine, depending on the species. Appendage patterning in Drosophila melanogaster is well characterized, inviting candidate-gene-based approaches that identify the developmental mec...

Journal: :Physical review letters 2012
A Lazarus H C B Florijn P M Reis

We present results from an experimental investigation of the indentation of nonspherical pressurized elastic shells with a positive Gauss curvature. A predictive framework is proposed that rationalizes the dependence of the local rigidity of an indented shell on the curvature in the neighborhood of the locus of indentation, the in-out pressure differential, and the material properties. In our a...

A. Ahmadi, A.A. Saki, D. Alipour H. Jahanian Najafabadi, M. Abdolmaleki Z. Bahrami

In this experiment, the effect of prebiotic Bio-Mos® (MOS) and types of feed formulation (total and digestible amino acids) were evaluated on performance and the small intestine microflora in laying hens for a duration of 10 wks. A total of 168 Hy line W-36 laying hens, with an initial age of 73 wks, were randomly allocated to 4 dietary treatments, 7 replicates and 6 birds in each replicate. Th...

2010
S. Canogullari M. Baylan Z. Erdogan V. Duzguner A. Kucukgul

This study was conducted to investigate the effects of garlic powder on the performance, egg traits, egg cholesterol and serum parameters of laying Japanese quails. One hundred and twenty 10-weeks-old quails were allocated to four dietary treatments. Quails were caged individually and fed diets supplemented with 0 (control), 1, 2, 4% garlic powder for 12 weeks. There were significant (P < 0.05)...

Journal: :تحقیقات دامپزشکی 0
میلاد شاعری گروه تغذیه طیور، دانشکده دامپزشکی دانشگاه گیلان، رشت- ایران اردشیر محیط گروه تغذیه طیور، دانشکده دامپزشکی دانشگاه گیلان، رشت- ایران زربخت انصاری پیراسرائی گروه فیزیولوژی دام، دانشگاه علوم کشاورزی و منابع طبیعی ساری، مازندران- ایران محسن تقی زاده گروه علوم تغذیه، دانشگاه علوم پزشکی کاشان، کاشان- ایران

background: improvement of hatchability in aging broilerbreeder has economic justification. objectives: the main objective ofthis study was to determine the effect of dietary anethum graveolensessential oil on egg quality, some plasma metabolites and hatchability inbroiler breeder hens. methods: a total number of eighty hens and eightcocks from ross 308 strain of 105 weeks old were divided into...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید