I agree with BRF. We have a batch of 50 broilers that are 7 weeks old today, we have not lost a single bird! The Commercial Cross birds are not as fragile as many want you to believe. Provide them with clean water, proper housing, and manage their feed and you will be in good shape.I have to disagree with your statement AgroUrica. If you have any losses after the first week or so, you have done something to cause it. These birds just don't die because of their breed. It may be nutritional or environmental or a combination, but there is always a reason.
Jim