This is actually a really interesting experiment. If you get enough plots you can put together your own graph. From this you do a simple regression analysis (most graphing calculators do this) to come up with a general formula. This is basicaly what the 'McIntyre' ratio and the Jacksons ratio are. I'd be curious to see how the ratios differ.
You can also probably find a program online that will also do this for you. To get the most accurate formula it is better to get as many plots as possible. Again we are only looking at size and weight... age really does not matter.
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Originally Posted by WriterNick
There is a graph called The McIntyre ratio for Horsfields but I don't believe that it's generally considered to be as definitive as the Jackson ratio for Hermanns? There is a link to it somewhere on SW (maybe in the caresheets section?) There is apparently a Mcintyre ratio for juvenile horsfields too which would be of interest to me but trying to find it is like searching for El Dorado!
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