If you leave them hungry at the end of a feeding, they are going to gobble it up fast the next time they are fed. I would do true free feed. Give them a week to catch up from you holding back feed. Then see how much they are eating. From that amount you could cut back slightly if weight is...
All eggs to be hatched should be placed in the incubator at the same time. After they have been in the incubator for 5 days or so veins become visible on viable eggs.
Only if feather damage is severe will the feathers grow back immediately. Most of the time feathers only grow back once a year. That time of year is about now, but each one goes at her own pace
Often people will refer to a hen that is mated often as being a favorite. That is not always the...
Are you trying to say a vet said this chick has Marek's? Or what chick had Marek's? Marek's presents in many ways, usually when Marek's is confirmed it is on a bird that has died. If one bird in the flock had Marek's the rest of the flock carries it also.
Nothing you mention about the chick...
Sometimes the first egg of an olive egger can look like the one on the left because of heavy bloom and later look like the one on the right. If you got two on the same day the eggs are likely from 2 chickens.
Don't count your chickens before they hatch applies here. You need to figure out why the others died (most have some that do) and you need to get your survivor to being out of the shell.
Personally I would add more eggs to the current incubator, but only after double checking temperature in...
Since he went to a flock with other roosters it may take many months for him to fully integrate with the other flock.
In my mind there are at least two reasons to leave him where he is.
First and foremost you gave him away. He is no longer yours and you have passed the decisions of how to...
The rust color alone does not mean male, in fact having it on the chest in some breeds is a indicator of female. A comb that size at 7 weeks... Not sure if any leghorn pullets would have that, but the red color and size of the waddles should be enough to prove males. Not sure how Hoovers...
If you are able to warm one spot to the needed temperature, keep them dry and out of the wind it doesn't matter what breed the birds are. My hens have raised silkies during the winter.
I do not have personal experience with Marek's, but the most successful Marek's flocks I have read about are those that breed their own most resistant birds. Most of those that I'm aware of do not use the vaccine (it is not practical in a backyard flock and birds may still virus shed).
The natural process would be to lay a clutch of eggs then brood, so to keep brooding with out laying does mean the hormones are not balanced right. On the other hand, hens that lay and lay and never go broody do not have the hormone balances that would be needed in nature either.