If it is Eucalyptus you have then the chances of drying it in any useful form are very low.
Some UK grown species also develop internal shakes that can fool you into thinking you have achieved some useful wood only to have long 5-10 mm wide cavities in the middle.
Regardless of species, any logs harvested, especially during the growing season need sealing across the ends with minutes of cutting if you are to stand any chance of slowing down the end grain cracks you can see in your sample.