rooster straining to make bowel movement.

There is no search I can find here and I have looked through 6 pages and can't find any other info so I am asking.

I have a 3 year old Road Island red rooster who seems to be straining to move his bowel. He is in full molt too I believe because he has been loosing and replacing feathers the past 26 days.

To stand beside him you can see that he is straining and gowns as well.

My birds are fee range and I feed scraps, laying feed and oats at night.

The bowel that he dose make is the right color and consistency of normal.

He has been a little testy lately with the hens and the 7 week old pullets.

I have also heard him sneeze a few times this week.

***Is there anything I can do to help him?
Dose anyone have any ideas?