17

We really don't know - we can't really ask the chicken. At least, it's unlikely it's as painful as it can be with humans. The reason human birth is (or can be) very painful is that the human baby's head has to fit through the woman's pelvis. Since splitting from chimpanzees, human heads have gotten bigger, while the pelvis has gotten more narrow due to ...


8

A chick can't develop outside of it's egg, so you won't see an embryonic chick growing and wiggling in a pool of substance leaked from a cracked egg. Centuries ago, people believed in spontaneous generation: that life can arise from non-living things. A common example of this was the fact that maggots would "arise" from rotting meat if left to rot. ...


8

LG stands for "linkage group". It seems the Chicken Genome Sequence group (Hillier et al., 2004) allocated several linkage groups (alleles or genes which tend to be inherited together) to the microchromosomes (tiny chromosomes typical of birds and reptiles), in this case called "linkage group E64" and "linkage group E22....". There are a load more ...


5

Chickens are domesticated Red Jungle Fowl. In the wild, Red Jungle Fowl live in flocks with one rooster for every few hens (where "few" is probably less than five in the wild, though in zoos flocks may be larger and have a higher rooster:hen ratio). Since one rooster can fertilize many hens, in the wild virtually all eggs will be fertilized. Since jungle ...


5

When birds sleep, they do experience NREM sleep [1]. Furthermore, Kavanau (2002) concluded that NREM has evolved in warm blooded animals [2]. Birds provide a unique opportunity to evaluate current theories for the function of sleep. Like mammalian sleep, avian sleep is composed of two states, slow-wave sleep (SWS) and rapid eye-movement (REM) sleep that ...


5

Disclaimer: This is my understanding of the egg anatomy as a general biologist. There is most certainly better references and sources out there to explain this (please add better references if you know of any). If I understand you correctly, your question is why we do not see cell organelles in a cracked or boiled egg. If so, your question seems to stem ...


5

According to Atlas of Chick Development by Ruth Bellairs and Mark Osmond, a book I'm using for my developmental biology course : Air space is the space between the two shell membranes at the blunt end of the egg. The chick pushes its beak into this space shortly before hatching and takes its first breathe of air. Besides allantois is the extra embryonic ...


4

Yes it is real, in the sense that this protocol has been through a peer reviewed journal. Note that the embryo is developing outside the shell, not outside the egg. It is the fertilized egg that develops into the embryo. The shell only provides protection and allows exchange of gases. You can replace the shell with any other material that does the same job. ...


3

It seems like they are not affected by fluorescent light frequency. I did not find anything about their visual sampling rate. Their hearing is between 0-200Hz with an average of 86Hz so I guess the visual sampling rate is under this, but that's just a guess. We conclude that at the illumination levels used in this experiment, the hens did not perceive ...


3

In theory yes, so long as you maintain genetic variation within your flock of hens (e.g. by bringing in outsider males to prevent inherited diseases spreading), artificial selection will lead to a more productive flock. However I don't think it would be predictable and not necessarily an improvement every generation, surely productivity would be influenced ...


1

A clutch usually refers to all the eggs for a single reproductive event or laying or location. It can mean either all those laid by one organisms in one event or all those laid in a population in a single time and place. Which is usually clear in context. Even just for an individual it is a bit vague however and can refer to one laying or multiple layings ...


1

To answer with a question: How do you decide what to eat (if you don't know whether something is edible)? All animals have evolved taste and smell (and I'm sure even prior to eyesight). The purpose of taste and smell in terms of nutrition is to determine if something is edible. If something tastes bitter or extremely sour, this is mostly a warning sign for ...


1

Embryonic disc forms on top of yolk during cleavage on chicken embryo, while between amniotic sac and yolk sac inside blastocyst after implantation on human embryo. Some further processes take place on and in the embryonic disc: specifically these here during the week 3. Embryonic disc formation includes still during the 3rd week of development: Formation ...


Only top voted, non community-wiki answers of a minimum length are eligible