I get blood smears from time to time.
It seems that I see it more often after some time off from laying, be it coming back from moult, or starting to lay again in the spring after stopping over winter.
Other than those 2 factors, I have never been able to connect it to anything else for an experienced layer and I haven't noticed any other thing wrong with the chichen doing it.
I have had blood specs inside the eggs. Maybe it is disgusting, but if I crack 4 eggs into the bowl and the 4th one has a bloody spot in it, I just pick out the bloody spot and scramble the rest.
My father in law raised egg layers on a large scale (several thousand birds) about 50 years ago. He is gone now, but he once told me that any time there is a stress in the chicken house, you will get some blood spots. He said that this included fighting, predatory threats, or storms. It seems to be true.
Interestingly, his were cage layers, but the cages were huge. The hens had a comfortable environment. He never dreamed back then of using tiny cages. He hand collected the eggs every day. It was a very labor intensive project. He also raised cattle. It was a living, but barely. He got a job offer in town and took it. He sold the hens but kept the cows.
I've probably posted this picture of my rooster looking at the kitten. I just wanted to say that not only has he totally stopped being aggressive toward me, he follows me around the yard. He knows that I am good for treats. Today he followed me and my horse in the arena. I had to get my husband to come run him out so that he wouldn't get stepped on. Silly bird.
OK, now they've gone too far! ROFL! Setting the scene, below is a pic of my coop:
You can see the windows and the 'shutters' tucked up in the fair weather position. Well, a couple of the girls have taken to roosting on one of the shutters when they're up. The other is pretty close to the ceiling because hubby half insulated the roof. I had not seen any of them up on that shutter but obviously SOMEBODY was booby trapping the thing today because when I went in to drop the shutters for the night, I got beaned with an EGG! Somebody decided to lay an egg up there and I never suspected a thing, so when I closed up I got it. BRATTY HENS!
Never mind hubby and Coochie, I took the pic to show a friend what a Cochin looks like, she'd never seen a chicken with 'furry' feet.
He's definitely better than his namesake - Spike - I used to have to use a dustbin (is that trash can in US?) lid as a shield every time I went in the run - he was pure evil!!!
Yes, dustbin=trash can here. I had one of those, his name was Rooster C (as in Cogburn), he was gorgeous and he was one of the nastiest critters I've ever come across. We started calling him Roostah C the Gangstah Roostah because he was so aggressive. He culled himself in the dog's yard the day he drew blood and I was going to put him in the pot. Either way, problem solved.