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# hatching % question ( math)

This is a math question on hatching %.
I cant get in my head how to get the % hatched.
Okay lets use this as an example.
you started with 42 eggs
5 were clear at 8 days, do you count them ( I don't)
37 eggs went the full 21 days with chicks developed.
29 hatched out live chicks
8 eggs never hatched but had full term chicks in them
How do you get the % of your hatch?
Thanks

I'm a Breast Cancer Survivor

hatching eggs available from pure =Welsummers, Black Ameracauna,  Golden Lakenvelders,  Blue Andalusians, Buff Orpington plus3 more breeds, pictures can be seen on my page with more to come. http://www.backyardchickens.com/forum/viewtopic.php?id=310644

Also Blue Laced Red Wyandotte eggs.

I'm a Breast Cancer Survivor

hatching eggs available from pure =Welsummers, Black Ameracauna,  Golden Lakenvelders,  Blue Andalusians, Buff Orpington plus3 more breeds, pictures can be seen on my page with more to come. http://www.backyardchickens.com/forum/viewtopic.php?id=310644

Also Blue Laced Red Wyandotte eggs.

eggs in - eggs out devided by eggs in x100 - 100 = % hatch and i would count the 42 in so you had 42-29=13/42=.31x100=31% - 100% =69% hatch rate     Some one let me know if im wrong

Quote:
Originally Posted by okiehen

This is a math question on hatching %.
I cant get in my head how to get the % hatched.
Okay lets use this as an example.
you started with 42 eggs
5 were clear at 8 days, do you count them ( I don't)
37 eggs went the full 21 days with chicks developed.
29 hatched out live chicks
8 eggs never hatched but had full term chicks in them
How do you get the % of your hatch?
Thanks

I don't count clears, when I do my percentages of a hatch.  Bloodrings or quitters I do but not clears.

Divide your 37 that you had on day 18 into the 29 live that hatched.  78%

Smith/Giles "project" Lavender Orpingtons, Spring of 2012 Part English "project" Lavenders , Part English BBS Orpingtons, Buff Orpingtons and Bantam Light Brahmas.  Follow me down the yellow brick road!!!

I'm holding out for the gold star !!!!

Smith/Giles "project" Lavender Orpingtons, Spring of 2012 Part English "project" Lavenders , Part English BBS Orpingtons, Buff Orpingtons and Bantam Light Brahmas.  Follow me down the yellow brick road!!!

I'm holding out for the gold star !!!!

If you are not counting the non-fertile eggs, your rate is 29 divided by 37 times 100 equals 78%

If you count ALL eggs, even the clears, you are getting your Fertility Rate, not the hatch rate.

If you count only the ones that start developing, then you have your hatch rate.

Make sense? I removed 15 Blue Orp eggs from my last batch, all infertile. Had a butt fluff issue.  I do not count those in my hatch rate.

Started with 42 eggs of several breeds. Of those, 17 were not fertile/clear. So I actually just had 25 eggs that I can get my hatch rate from. 21 hatched, so my hatch rate is 84%. Take 21 divided by 25.

Edited by speckledhen - 2/27/09 at 10:42am

~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

Living the Good Life in the North Georgia Mountains~ Cynthia

~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

Living the Good Life in the North Georgia Mountains~ Cynthia

Quote:
Originally Posted by speckledhen

Had a butt fluff issue.

That sounds like a personal problem..

Is it anything like "junk in your trunk"...

I kill myself....

English and French BCMs, BBS Orpingtons, Blue/Wheaten Amaraucanas, Split Lavender Amaracanas, Welsummers, Barnevelders, Buckeyes

Life isnt about how to survive the storm, but how to dance in the rain
English and French BCMs, BBS Orpingtons, Blue/Wheaten Amaraucanas, Split Lavender Amaracanas, Welsummers, Barnevelders, Buckeyes

Life isnt about how to survive the storm, but how to dance in the rain

LOL, not quite. Should have said the birds had a butt fluff issue, but since it messed up my plans, it became mine.

~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

Living the Good Life in the North Georgia Mountains~ Cynthia

~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

Living the Good Life in the North Georgia Mountains~ Cynthia

Okay thanks that helps now. My husband was getting 77%
So every hatch we can take the number of hatched chicks
divided by the # of eggs that make it to 21 days . this get the right %
Thanks a bunch.

I'm a Breast Cancer Survivor

hatching eggs available from pure =Welsummers, Black Ameracauna,  Golden Lakenvelders,  Blue Andalusians, Buff Orpington plus3 more breeds, pictures can be seen on my page with more to come. http://www.backyardchickens.com/forum/viewtopic.php?id=310644

Also Blue Laced Red Wyandotte eggs.

I'm a Breast Cancer Survivor

hatching eggs available from pure =Welsummers, Black Ameracauna,  Golden Lakenvelders,  Blue Andalusians, Buff Orpington plus3 more breeds, pictures can be seen on my page with more to come. http://www.backyardchickens.com/forum/viewtopic.php?id=310644

Also Blue Laced Red Wyandotte eggs.

Quote:
Originally Posted by okiehen

This is a math question on hatching %.
I cant get in my head how to get the % hatched.
Okay lets use this as an example.
you started with 42 eggs
5 were clear at 8 days, do you count them ( I don't)
37 eggs went the full 21 days with chicks developed.
29 hatched out live chicks
8 eggs never hatched but had full term chicks in them
How do you get the % of your hatch?
Thanks

Never count the clears.

The total eggs developing at day 7, divided by the number of hatched chicks.

So .... 29 / 37 = a respectable 78.4%

The reason clears aren't counted is simple. We are trying to maximise hatch rates, and considering improvements if the rate falls below around 95%.

The 8 dead-in-shell are an issue you can address.

If you count eggs that couldn't have hatched, you skew the figures unhelpfully.

x = total number of eggs set
y = number of eggs that have development at day 10
z = number of hatched chicks that are viable.  Any chicks that have to sadly be culled are not included in this number.

% Fertility = (y / x) *100%
% of hatch rate = ( z / y ) *100%

Matt

Foothills Poultry since 2003

- Standards: SQ Black Cochins
- Bantams: BCLB/CLB Dutch, Calico Pet Project, and lots of Pets

Foothills Poultry since 2003

- Standards: SQ Black Cochins
- Bantams: BCLB/CLB Dutch, Calico Pet Project, and lots of Pets

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