scholarly journals Impact of hen treatment with bee pollen and thermal manipulation during early egg incubation period on the hatchability and embryonic development of chicks

2018 ◽  
Vol 27 (4) ◽  
pp. 341-348 ◽  
Author(s):  
A. Abuoghaba ◽  
Y. Rizk ◽  
I. Ismail ◽  
N. Awadien
Keyword(s):  
Embryonic Development ◽  
Incubation Period ◽  
Bee Pollen ◽  
Egg Incubation ◽  
Thermal Manipulation

Fecundity and duration of egg incubation for multiparous female snow crabs (Chionoecetes opilio) in the fjord of Bonne Bay, Newfoundland

1999 ◽  
Vol 56 (6) ◽  
pp. 1088-1095 ◽  
Author(s):  
Michel Comeau ◽  
Michel Starr ◽  
Gérard Y Conan ◽  
Guy Robichaud ◽  
Jean-Claude Therriault
Keyword(s):  
Embryonic Development ◽  
Incubation Period ◽  
Reproductive Cycle ◽  
Developmental Stages ◽  
Carapace Width ◽  
Egg Mass ◽  
Chionoecetes Opilio ◽  
Egg Incubation ◽  
Snow Crabs ◽  
Multiparous Female

Multiparous female snow crabs (Chionoecetes opilio) were collected by trap and Nephrops trawl in the fjord of Bonne Bay, Newfoundland, between April 1988 and August 1992 to study the fecundity and embryonic development. A relationship was established between the color of the egg mass and embryonic development. Fecundity was positively correlated with carapace width. A female of 67 mm carapace width can produce up to about 54 000 eggs. Egg mortality over the incubation period could reach 21%, being greater in larger females. Based on the bimodal distributions of embryonic developmental stages observed in the study, the female reproductive cycle was determined as 2 years and females probably only hatch two broods in their lifetime. Eggs hatch mainly in May and June.

scholarly journals Dynamics of Structural Barriers and Innate Immune Components during Incubation of the Avian Egg: Critical Interplay between Autonomous Embryonic Development and Maternal Anticipation

2018 ◽  
Vol 11 (2) ◽  
pp. 111-124 ◽  
Author(s):  
Maxwell T. Hincke ◽  
Mylène Da Silva ◽  
Nicolas Guyot ◽  
Joël Gautron ◽  
Marc D. McKee ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Innate Immune ◽  
Vitelline Membrane ◽  
Structural Barriers ◽  
Embryonic Tissues ◽  
Egg Incubation ◽  
Evolutionary Success ◽  
Protective Structures ◽  
Amniotic Membranes ◽  
Autonomous Development

The integrated innate immune features of the calcareous egg and its contents are a critical underpinning of the remarkable evolutionary success of the Aves clade. Beginning at the time of laying, the initial protective structures of the egg, i.e., the biomineralized eggshell, egg-white antimicrobial peptides, and vitelline membrane, are rapidly and dramatically altered during embryonic development. The embryo-generated extra-embryonic tissues (chorioallantoic/amniotic membranes, yolk sac, and associated chambers) are all critical to counteract degradation of primary egg defenses during development. With a focus on the chick embryo (Gallus gallus domesticus), this review describes the progressive transformation of egg innate immunity by embryo-generated structures and mechanisms over the 21-day course of egg incubation, and also discusses the critical interplay between autonomous development and maternal anticipation.

scholarly journals High air humidity is sufficient for successful egg incubation and early post‐embryonic development in the marbled crayfish ( Procambarus virginalis )

2019 ◽  
Vol 64 (9) ◽  
pp. 1603-1612 ◽  
Author(s):  
Wei Guo ◽  
Jan Kubec ◽  
Lukáš Veselý ◽  
Md Shakhawate Hossain ◽  
Miloš Buřič ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Air Humidity ◽  
Egg Incubation ◽  
Marbled Crayfish

Mechanics of Embryonic Head Fold Morphogenesis

2008 ◽  
Author(s):  
Victor D. Varner ◽  
Dmitry A. Voronov ◽  
Larry A. Taber
Keyword(s):  
Embryonic Development ◽  
Incubation Period ◽  
Neural Plate ◽  
Vitelline Membrane ◽  
Heart Tube ◽  
Germ Layers ◽  
Embryonic Tissues ◽  
Anterior Extent ◽  
Insight Into ◽  
Embryonic Head

Head fold morphogenesis constitutes the first discernible epithelial folding event in the embryonic development of the chick. It arises at Hamburger and Hamilton (HH) stage 6 (approximately 24 hours into a 21-day incubation period) and establishes the anterior extent of the embryo [1]. At this stage, the embryonic blastoderm is composed of three germ layers (endoderm, mesoderm, and ectoderm), which are organized into a flat layered sheet that overlies the fibrous vitelline membrane (VM). Within this blastodermal sheet, a crescent-shaped head fold develops just anterior to the elongating notochord, spanning across the embryonic midline at the rostral end of neural plate. At the crest of this fold, the bilateral precardiac plates fuse in a cranial to caudal direction and give rise to the primitive heart tube and foregut [2, 3]. An understanding of head fold morphogenesis may thus offer insight into how embryonic tissues are arranged to make ready for proper cardiac formation.

Sign in / Sign up

Export Citation Format

Share Document