Actually the point I should have made is that presumably you are saying that when an animals suffers in the wild, being predated, possibly geting injured and having to live with pain and injury indefinitely, when an animal dies slowly and painfully in giving birth to young, the offspring dying as well, or lives for a prolonged period with a disease that is 'good' pain that is the price the animal must pay for not being domesticated.
However, domesticated and in humane and careful care - and I am talking about high welfare methods, any illness or disease is treated or the animal is saved prolonged suffering by slaughter. Slaughter is a last resort. In giving birth there is aid and assistance when needed.
I do not believe high welfare animals suffer anymore than their undomesticated counterparts.
I would point out that one of your references refers entirely to US agriculture, not British, and there is no argument that US standards are much lower than ours and aimed at human safety not animal welfare.
I am one with you in condemming industrial animal husbandry, but consider good welfare methods give animals, a short life but almost a cossetted one, compared with the sufferings of their wild counterparts.