Does anybody have any experience with formerly good-natured cockerels becoming aggressive with the hens? Ours, Olaf, has always been pleasant with the hens (he has always been very active when it comes to performing his duty, but was never overly rough with them). In the last few weeks the hens have almost stopped laying with the colder weather and Olaf has stopped mounting them, but he is turning increasingly grumpy. He seems to go for the hens over nothing, although he doesn't actually doing anything... he runs at them as if to peck them and they move and he stops (although he did grab one by the tail earlier!). Is it just that he is no longer getting laid (excuse the pun)? I was just outside for about 20 minutes and saw him chase hens off at least 10 times in that period, although they do still eat and gather around him and roost alongside him cosily at night.