Tapeworms you can see on the feces- they look like cous cous on the outside of the feces. They look very similar to cat/dog tapeworms, and also move a bit in fresh feces. Round worms are large and can also be seen if they die and pass out in the feces- excuse the food analogies but they look like pieces of vermicelli or angel hair pasta. 1"-2" long. You will rarely see the round worm adults in the feces. Unless you just dewormed and they are passing out.
Vet labs can run a fecal sample microscopically and ID the parasite eggs (tapes, rounds, and other worm types). Protozoal organisms like coccidia will also show up in the microscopic exam.
Chickens who are allowed access to dirt and bugs, or are housed where other poultry have been will always accumulate GI parasites with time. They can cope with moderate numbers, but when ill- they can get overwhelmed. If you ever do a home necropsy on a deceased bird, you will often find surprising numbers of visible to the eye worms ect, especially if the birds are not routinely dewormed every year.
So in answer to the question 'how do you know' is they probably do right now, but in small numbers are not likely causing the bird much harm. If you want to deworm, or find out via testing that they do have worms- you then have the can of worms- to treat or not to treat, and go read the recent posts on drug residues....
jess
Vet labs can run a fecal sample microscopically and ID the parasite eggs (tapes, rounds, and other worm types). Protozoal organisms like coccidia will also show up in the microscopic exam.
Chickens who are allowed access to dirt and bugs, or are housed where other poultry have been will always accumulate GI parasites with time. They can cope with moderate numbers, but when ill- they can get overwhelmed. If you ever do a home necropsy on a deceased bird, you will often find surprising numbers of visible to the eye worms ect, especially if the birds are not routinely dewormed every year.
So in answer to the question 'how do you know' is they probably do right now, but in small numbers are not likely causing the bird much harm. If you want to deworm, or find out via testing that they do have worms- you then have the can of worms- to treat or not to treat, and go read the recent posts on drug residues....
jess