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#116519 - 03/18/17 08:44 AM Pullet eggs
RC Offline
Chicken

Registered: 08/21/09
Posts: 139
Loc: South Carolina
Hi hope all are doing great... Are there any studies, research papers out there that address pullet size eggs? What causes it? How to breed against it? That sort of information..

Thanks a ton for any and all information.

Keith

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#116520 - 03/18/17 04:26 PM Re: Pullet eggs [Re: RC]
Redcap Online   content
Ruler of the Roost

Registered: 08/14/06
Posts: 946
Loc: Germany
The best advice which You should consider is that, what You can read already in antiquie books. "Do hatch only from two Year old hens or older."
Consequently the hatching egg weights and the hatchlings would profit ... and over the years You will achieve a bigger egg size.
In general You should only take eggs which are minimum 10 % above the hatching egg weight, which is mentioned in the Standard.
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#116521 - 03/18/17 05:21 PM Re: Pullet eggs [Re: RC]
John Online   content
Chicken

Registered: 04/21/11
Posts: 75
Loc: Michigan
Check out http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=115073&page=2

Originally Posted By: KazJaps
You're forgetting what D. Caveny & R. Okimoto said, ie you are excluding genetics potential again. A pullet laid egg has the same genetic potential as when the hen lays an egg when 2 years old. The pullet egg will hatch as a smaller chick, the mature hen's egg will hatch as a larger chick, but both chicks will reach the same adult size. So no, a bigger egg yolk does not mean bigger end weight, when comparing apples with apples (given the same genetics).


Edited by John (03/18/17 05:24 PM)
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#116522 - 03/18/17 07:41 PM Re: Pullet eggs [Re: John]
Redcap Online   content
Ruler of the Roost

Registered: 08/14/06
Posts: 946
Loc: Germany
A quick Google search
http://bfy.tw/AiRD

Four of the first results
https://www.ncbi.nlm.nih.gov/pubmed/22010254
https://www.ncbi.nlm.nih.gov/pubmed/12828203
http://www.wpsa.com/index.php/wpsa-proce...ching-eggs/file
http://hatchtechgroup.com/media/document...ose.pdf?lang=en

To compare apples with apples a small egg (yolk) means a "pemature hatching" in comparison with a big egg (yolk).
That's a simple reasoning which several poultry book authors (in german or english) made already 100 Years (or more) ago.
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#116541 - 03/23/17 10:21 PM Re: Pullet eggs [Re: Redcap]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2792
Loc: Australia
RC, you might find some useful information in commercial breeder documents for raising their lines. Ie information given to commercial producers. I know they have it down to a fine art the pullet chicks & grower flock dietary requirements etc (ie actual bird parameters, eg like the percentage of the flock starting to lay -at what age, egg size at what age, etc).

Commercial layers start laying much earlier these days too, & this will influence the pullet's egg size.

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#116543 - 03/24/17 02:06 PM Re: Pullet eggs [Re: KazJaps]
Redcap Online   content
Ruler of the Roost

Registered: 08/14/06
Posts: 946
Loc: Germany
Furthermore:
The new "art" to boost chicks is called in-ovo feeding
Google Search
http://bfy.tw/Aq8M

Rescue of late-term aka athreptic/starving chicks by in-ovo feeding
http://bfy.tw/Aq8h
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#116546 - 03/26/17 04:29 AM Re: Pullet eggs [Re: RC]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2792
Loc: Australia
Originally Posted By: RC
Hi hope all are doing great... Are there any studies, research papers out there that address pullet size eggs? What causes it? How to breed against it? That sort of information..


RC, I'm not exactly sure what info you are after, and as to what "address pullet size eggs" means?

As I hinted at earlier, there is a correlation with the age a pullet first starts laying, to the egg size. Would you prefer a pullet to start laying larger average eggs strait up, but at an older age? Eg, a commercial layer line might start laying at 18 weeks, but egg weight 42g, at 21 weeks age the egg weight 50g. Another layer line might start laying at 21 weeks, but first eggs weigh higher at 49g. So what would you prefer?

Plus there is feed conversion, eg would it matter to you that you might have to pay more in feed bills to get those larger eggs? Are you concerned about hatchability rates in pullet eggs?

As I mentioned earlier, there are good commercial breeder articles available for commercial producers. The following web page has a list of Hyline layer strains, summary of each traits.
http://www.hyline.com/aspx/products/productinformation.aspx

Then if you follow each layer strain url, you can download "parent stock management guides" of each layer strain (eg, Hyline Brown, Hyline W-80, Hyline W-36, Hyline SIlver Brown, etc). These give extensive production data, not only management recommendations. Eg:

- average pullet first lay age (% of flock),
- average egg weight for each week of age,
- percentage of settable eggs for each week of age (they set eggs over 50g weight),
- hatchability rate for each week of age (note this peaks around 30 to 35 weeks of age, levels out, then starts dropping around week 43 hen age).
- number of female chicks produced up to 75 weeks
- feed consumption
etc...
*Note, although they want first lay pullet eggs to be over 50g for setting, they also try to keep older pullets /young hens laying under a certain egg weight (by controlling diet - eg reducing protein %, etc).
-----------------
Unfortunately I didn't find Hyline tables that collated / compared all their lines. So I had to flip through each parent stock management guide. Quite interesting the different first lay ages, egg weights, hatchability rates, etc.

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#116563 - 04/07/17 04:09 PM Re: Pullet eggs [Re: KazJaps]
RC Offline
Chicken

Registered: 08/21/09
Posts: 139
Loc: South Carolina
HI thanks for the info... I looked at the Hyline info KazJaps and my birds, the way i grow them out weigh more than the birds in that info at 17 wks...

again thanks a ton for the info... good stuff and thanks a ton


Keith

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#116577 - 04/15/17 01:25 PM Re: Pullet eggs [Re: RC]
RC Offline
Chicken

Registered: 08/21/09
Posts: 139
Loc: South Carolina
What I found most interesting was the Hy-Line Brown, where they use a red feathered male over a white feathered female and they lay rich brown eggs... What do you think is the make up of the white females... ?

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#116578 - 04/15/17 05:32 PM Re: Pullet eggs [Re: RC]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2792
Loc: Australia
I'm not certain about Hyline Brown layers specifically, but it was Warren who originally developed a synthetic RIW parent line for terminal sex-linked cross to RIR, to produce a commercial white tailed red, brown-egg layer.

This commercial layer RIW line is not related to exhibition RI whites, as was developed by using White Rock sires over commercial RIR hens, then very heavy selection in the F2 of eWh S I.

See the following post for the history:
http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=114831#Post114831

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