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Hard to plan for broilers with broody hens... first, there is no way to force an hen to go broody on your schedule, so you would have to wait for them to get in the mood for it.
Second, if you do get one to set a hatch for you it is a toss up if you will get chicks or how many so unless the eggs are cheap or free you may loose money on the cost of the meat.
Third, although heat needs are reduced with a broody you need to remember that she can only keep chicks warm as long as they fit under her. Most broilers grow very quickly and the broody will likely need help keeping them warm after only a couple of weeks if the weather is cold. To minimize this you would need to keep the hatch numbers lower than you would for standard breeds. Fourth issue... space... although you can sometimes luck in to hens willing to share space it is more often a recipe for squabbling and broken or cold eggs when the dominant hen pushes out others. So you would need to set up at least a few other areas as 'back ups'.
These issues are all dependent on the number of broilers you are wanting to hatch, how the weather is when you want to raise them, and what breed you want to raise (Cornish cross broilers will outgrow most hens by week 3 or so, freedom rangers may be 5 or 6 weeks, so not as much trouble). It would be a great solution if you only want a few at a time for family needs, but not near as viable an answer if you want to process 25 or 30 birds at a time.
I am real new at chickens but not that new. I am going to raise broilers in the spring. I am thinking about using a broody hen to hatch eggs instead of ordering chicks. I work at a farm and look after 145+ layers. I would need to use more than one hen as these are sex-link layers. Can you put several hens in the same brood box or do they need their own space? I really like that I can put the chicks out with mama and not have to keep them in a brooder with a heat lamp. Is their any good books out their that will help me or anyone on this forum? Need lots of info.
Thanks!
Fisherlady gives solid advice regarding your question.
You can use broodies for meat birds, but the drawbacks are as she stated if you want to do this large scale for commercial purpose...getting the timing down and the growth of the chicks (as commercial meat birds...ie Cornish X...grow so fast that they are ready for table by 8 weeks.)
Because of this fast growth, Cornish X meat birds take specialized care. I know there are those on BYC who believe this is exaggerated, but the Cornish X has been genetically selected (ie the hybrid has been chosen over the generations to select for those who grow very quickly). This fast growth rate can cause issues, so you have to be careful how you house, feed, and care for them...I foresee potential failure rates with broodies if you hope to be able to let the broody do the work for you so you don't have to oversee them closely.
If you are wanting to do commercial industry meat birds, for profit, it would be best to use the industry standards with heat lamps and pens and watch with care. (I have two close friends who lost a lot of their first crop of Cornish Cross simply due to the large learning curve dealing with this specialized hybrid.)
If you want to do a few for family use, then it could work as you would be processing more for your family table and could afford to wait for brooding timetables and then move them to pens, or whatever, if they outgrow the broody. If that is the case, I would recommend going to a more heritage style dual purpose bird. I would recommend Buckeyes (a breed I've researched in depth as I plan to begin to add them to my flock).
Buckeye males grow to 4 pounds by 16 weeks with good size breast meat. There is a Buckeye forum on BYC that has a lot of information (sometimes too much) but would be a good place to learn about Buckeyes. (Post on Buckeyes processed for meat) https://www.backyardchickens.com/t/803253/the-buckeye-thread/1590#post_12485509
If you are planning to use the Red Sex links you mentioned on the farm you work on, it is not likely to happen in the fequency you would hope...they rarely go broody as they have been genetically selected to be good layers and not waste time wanting to hatch eggs (brood). Buckeye hens are not noted as being high frequency brooders but as "can go broody" by the Henderson Breed chart (http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html).
For sustained and long term regular use of brooding to hatch chicks, I have found it best to purchase known broody types...ie Cochin or Silkie (being aware that a Silkie bantam can realistically only fit about 6 standard large eggs under her and then care for that number of large fowl chicks). Those breed types that are listed as "annoyingly frequent" in brooding on the Henderson chart typically go on broods regularly. (My Silkie is about every 3 months.) A number of the breeds are large fowl that could fit 10 to 12 eggs and care for them...ie Cochin, Chantecler, many use Orpingtons (although mine were never especially broody), and one gal who frequents this Broody section swears by Cornish or Indian Game (not to be confused with the Cornish Cross which is the commercialized hybrid developed from Cornish and typically Rocks). Games are also known for being very broody as well.
My thoughts
Lady of McCamley