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Prof. Russo

post #1 of 9
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I'm a biology professor and have often wondered.  What initiates egg laying in hens?  Don't they have to be fertilized first for viable or unviable eggs to form?    The shells must form AFTER fertilization as sperm cannot penetrate.If not,  how is it possible for unfertilized hens to lay eggs w/ hard shells?

post #2 of 9
Hi welcome-byc.gif

Glad you could join the flock! Here is a link to how the hen forms and produces the egg ~http://www.backyardchickens.com/t/1052511/the-magic-behind-farm-fresh-eggs/0_30

Yes the sperm has to fertilise the ova first before the egg is formed by the hen.

Hope the link helps you with how an egg is formed. frow.gif
post #3 of 9

:welcome

 

If you haven't already, check out the articles in the Learning Center...poultry is very interesting:

http://www.backyardchickens.com/atype/1/Learning_Center

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Check out all 11 new mini contests!

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Deadlines for all is Dec. 11, 2016

You can't win if you don't play!

 

8th Annual BYC New Year Day Hatch-Along - Hosted by Ronott1

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post #4 of 9
Welcome to BYC. Glad you decided to join our flock. I'm an Earth Science major, not a biology major, but I have taught high school biology before. X2 on Yorkshire coop's answer to your question. :o) Please feel free to ask any other questions you may have. We are here to help in any way we can. Cheers.    
post #5 of 9
Hello!

Welcome to BYC and the coop! There's a lot of great peeps here! Feel free to ask lots of questions. But most of all, make yourself at home. I'm so glad you decided to joined the BYC family. I look forward to seeing you around BYC.
Did a moth know that the flame was going to change her life forever, or did she simply fly towards that heated embrace, knowing it would offer her something she couldn't give herself? In the end, the answer didn't really matter. The moth had never wanted the choice. -Joey W. Hill-
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Did a moth know that the flame was going to change her life forever, or did she simply fly towards that heated embrace, knowing it would offer her something she couldn't give herself? In the end, the answer didn't really matter. The moth had never wanted the choice. -Joey W. Hill-
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post #6 of 9
Quote:
Originally Posted by lawrence russo View Post
 

I'm a biology professor and have often wondered.  What initiates egg laying in hens?  Don't they have to be fertilized first for viable or unviable eggs to form?    The shells must form AFTER fertilization as sperm cannot penetrate.If not,  how is it possible for unfertilized hens to lay eggs w/ hard shells?

Welcome To BYC! Please make yourself comfortable. Ask any questions you may and we'll do our best to answer them.

 

I'm a high school senior and hope to go into the veterinarian medicine area. Day light, nutrition, and water effect egg laying. Longer daylight the more a hen will lay. If she doesn't have what she needs for nutrients her ovary will stop making follicles and then you don't get any eggs. Chickens need the protein for the energy to lay and that energy also goes into the egg along with other nutrients. Chickens also need calcium to form a shell on the egg. Without enough calcium the hen will start eating feathers to try and get calcium or her body can take it from her bones or her eggs won't have a shell to them and will only have the shell membrane. Water to keep the hen hydrated and keeps the body lubricated to allow the egg passage without much damage done to the wall of the oviduct or vent. A hen doesn't need to be bred by a rooster to lay an egg. Fertilization happens before the albumen forms around the yolk. If I remember a hen's anatomy from start to finish you have the ovary,the oviduct (which consists of the infundibulum, magnum, isthmus, and uterus/shell gland), and then the vent. The ovary contains all of the ovas/eggs where each cell will develop and a follicle will produce and then burst releasing the yolk. The Infundibulum is like a catcher's glove, catching the yolk and also where fertilization takes place. The yolk goes down the Magnum which is where the albumen is added. Then is the isthmus where the shell membrane is forms. Then it passes to the uterus/shell gland where the shell forms and then it exits the hen through the vent.


Edited by Birdrain92 - 12/2/15 at 4:37pm
post #7 of 9

Welcome to the BYC flock!  We are glad you joined us!

 

:jumpy:cd:welcome:cd:jumpy 

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Sassafras Grove Farm

sassafrasgrovefarm@outlook.com     sassafrasgrovefarm.weebly.com (not yet published)

 

Black Double Laced, Blue Double Laced and Splash Barnevelders

Silver Double Laced Bantam Barnevelders

Silver, Charcoal, and Birchen Iowa Blues

Swedish Flower Hens

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post #8 of 9

Chickens are quite able to produce eggs without a rooster, albeit non-fertile eggs.

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post #9 of 9

Welcome to BYC! I'm glad you joined us! :)

I set fire to the rain! Watch it pour as I, touched your face. Well it burn while I cried, because I heard it screaming out your name. And I threw us into flames. I knew that was the last time, the last time...I set fire to the rain! -Adele

 

Look at my flock page! http://www.backyardchickens.com/a/bantamfan4lifes-flock

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I set fire to the rain! Watch it pour as I, touched your face. Well it burn while I cried, because I heard it screaming out your name. And I threw us into flames. I knew that was the last time, the last time...I set fire to the rain! -Adele

 

Look at my flock page! http://www.backyardchickens.com/a/bantamfan4lifes-flock

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