On lending out your rooster. That should never be done because it causes a whole new set of problems. The pecking order is very important and it could take a long time for your hens to adjust to the new set up let alone your neighbors hens would also take a while for the new dynamics in the flock. And then when you bring your rooster back the dynamics changes again in both flocks and you could cause your hens, and your neighbors hens, to stop laying for a while. If you lend out a rooster, don't bring it back especially if there's another rooster in your flock because it can lead to fighting. Just my humble opinion of 50 years raising chickens. Wait until one of your hens has a clutch of eggs she's brooding and then offer them to your neighbor or tell your neighbor to purchase their own rooster - doesn't cost that much.
X2!!
