"My Large Whites and White leghorns don't get on together ..
"Where isa the problem?"
They don't get on because of a difference in their attitude towards your fondness for having bacon and eggs for breakfast.
Your hens are involved but your pigs are totally committed.
This explains why White Leghorns have white feathers - as a symbol of moral cowardice.
But the poor things are not cowards, they are just being sensible - as all chooks are - leaving it to your pigs to make the the Ultmate Sacrifice.
But what ever you do - don't give in Green pressure and run your Large Whites as free-range not housed pigs.
Large Whites were bred in a much gentler climate that ours and like the Poms who bred them, if sent out into the hot Aussie they will develop severe sun burns and skin cancers.
Why it's not kind to force Large Whites to live outside in the hot Aussie sun is made abundantly clear by observing the skin and hair colour of feral or wild pigs. Though pigs of many hues were introduced to Australia for their meat - of the ones that escaped from farms, all the wild pigs today are black!
Mother Nature or Evolution has many lessons for the humble and the wise but only shrieks of mirth for those with closed (or conservative) minds - many of whom gather in the cool shade of Hot Copper to discuss why Graham is so stupid to build defences against Climate Change in the hot sun (wearing sun-screening working clothes and a straw hat) while it's much more fun to sit in the shade and discuss what a fool he is because climates *always* obey Conservative rules and never ever change - for the worse!