Egg Charts

[Pete Kent]

I'm interested to find out how different breeders calculate and plot an egg chart when done on paper and not by computer programmes.

I have been taught to do for Peregrines in the following way:

• Record the egg weight on the day taken.

• Multiply 0.48 X the number of days old the egg is.

• Subtract that figure from 100.

• Divide the 'Weight When Taken' by the figure you've just worked out to give an 'Estimated Fresh Weight' of the egg.

Example:

Egg is 10 days old and weighs 45 grams when taken.

0.48 (%) x 10 (days old) = 4.8 (%)
100(%) - 4.8(%) = 95.2(%)
45(grams) ÷ 95.2(%) = 47.26(grams)

'Estimated Fresh Weight' is 47.26 grams - 15% = 'Target Hatch Weight' = 40.17 grams.

How do you do your chart ?

[Pete Kent]

Apparently I seem to be the only one who draws a chart and weighs the eggs !

[Altai]

Weigh fresh egg.
Find 15% of fresh weight. Subtract the 15% weight from the original and that is your target weight at pip. Plot the fresh weight and target weight on graph paper. Draw a line between them and that is your weight loss target line.

[Pete Kent]

Weigh fresh egg.
Find 15% of fresh weight. Subtract the 15% weight from the original and that is your target weight at pip. Plot the fresh weight and target weight on graph paper. Draw a line between them and that is your weight loss target line.

I'm with you on that but it's finding the fresh weight I'm interested in, as I said I have shown how I work it out but I know some people use other ways, that's what I was hoping breeders would discuss.

I have to estimate the fresh weight coz I don't like going in on the birds until the eggs are 10 days old which is when I take them.

[GSP]

Good thread m8
this should interest alot of people me included
Steve

[Pete Kent]

Good thread m8
this should interest alot of people me included
Steve

Judging by the response I was starting to think I must be the only one who draws a graph and weighs the eggs !

[Pearl]

put mine in the incubator set at 37.2 checked them every fours hrs by sight (temp) kept my hands i my pocket and have one hatched one pipped and one to pip today works for me ;) ;)

[Red-Devil]

put mine in the incubator set at 37.2 checked them every fours hrs by sight (temp) kept my hands i my pocket and have one hatched one pipped and one to pip today works for me ;) ;)

what your egg chart then had a game of pocket billiards lol

[Hacker]

I used the egg chart in Nick Fox`s Understanding the bird of prey book, appendix three.
Plotted egg age along bottom and then followed date line up until intersected graph line that matched egg weight.
Then follow line back to fnd out fresh egg weight or forward to find pip weight.

[Pearl]

what your egg chart then had a game of pocket billiards lol
pmsl :supz:

[Roel_Birds]

To calculate the fresh egg weight in the way you guys do it, you need to know how long the egg is already been incubated by the parents. When you take away a clutch of 5 eggs, you don't always know which egg was laid first and which last. When the female started incubating on the 3rd egg, there can be a difference of 4 days in incubation the egg has already had. To avoid this I use the next formula:

Fresh egg weight=Length x (width)² x kW

The kW is a constant figure that is specific for each species. You can find these figures on the website of Avian Incubation Management Service in the section Incubation Data.

Works fine for me. Good luck!

[Pete Kent]

To calculate the fresh egg weight in the way you guys do it, you need to know how long the egg is already been incubated by the parents. When you take away a clutch of 5 eggs, you don't always know which egg was laid first and which last. When the female started incubating on the 3rd egg, there can be a difference of 4 days in incubation the egg has already had. To avoid this I use the next formula:

Fresh egg weight=Length x (width)² x kW

The kW is a constant figure that is specific for each species. You can find these figures on the website of Avian Incubation Management Service in the section Incubation Data.

Works fine for me. Good luck!
Thanks Roel, I have looked at the 'Incubation Data' but am unsure of the kW value for a Peregrine (peregrinus peregrinus), do you know what it is ?

[Roel_Birds]

The kW value for Falco peregrinus peregrinus is 0.0005499. So when the egg is 50mm long and 39mm wide, the fresh weight is 50 x 39² x 0.0005499 = 41.82 grams.

Hope that helps.

Kind regards,

Roeland

[Pete Kent]

The kW value for Falco peregrinus peregrinus is 0.0005499. So when the egg is 50mm long and 39mm wide, the fresh weight is 50 x 39² x 0.0005499 = 41.82 grams.

Hope that helps.

Kind regards,

Roeland

Thanks Roeland, I'll test that later.

[Kentish Falconry]

Pete you would be far better off buying the AIMS program it saves so much time, it even fills in your DEFRA paperwork, if you want to see it running come over and I will show you.
I have been using it since 1996 and have never paid for an upgrade to the system you just go into the website and download each upgrade as it is published all you have to do is send in your egg data once a year to help improve the system. Best £250 I ever spent saves me hours of plotting eggs weight losses
Terry

[Pete Kent]

Pete you would be far better off buying the AIMS program it saves so much time, it even fills in your DEFRA paperwork, if you want to see it running come over and I will show you.
I have been using it since 1996 and have never paid for an upgrade to the system you just go into the website and download each upgrade as it is published all you have to do is send in your egg data once a year to help improve the system. Best £250 I ever spent saves me hours of plotting eggs weight losses
Terry

I would buy it without doubt Terry but I'm on an Apple Mac computer, it's not compatible and they haven't yet made a Mac version of the software.

Thanks for the offer though, I appreciate that.