Posted: 17/09/2014 at 16:13
I'm unsure why the thought is that a gamekeeper has introduced the pheasants. We had a load of them at our last house. They bred every year at the house across from us - our only near neighbour. He fed them, and they visited us regularly for food too - we could hand feed them. They sometimes got run over but that's life and nature I'm afraid.
A barrier - canes/timber with wire netting or similar - round the tree will help keep them away. Put some other food out for them in a different part of the garden as well so that they get used to that instead of raiding your tree. As they get bigger, which is quite quickly, they'll fly less and stick to the ground more. They're basically fancy chickens, so they need a good run to get up in the air