Alright, I think its easy as pie. But when people take short cuts, or some people just don't have the proper resources available to them. issues always seem to occur. This seems to be a BIG reason.
I think if you want to have success the following should be a REQUIREMENT
1. MAZURI 6F!! No dog food! Some have luck some don't therefore I don't use it. Thats enough proof in the pudding for me. Whenever I use 6f I had nothing but great results.
2. Proper enclosure! Large mortar tubs are best. They give them lots of room to roam around, and be as stress free as possible. I don't think cat litter pans are sufficient for allowing mothers to move around and do their "thing" so to speak. 1.3 in each Make sure you have a nice watering system, and keep them clean by cleaning them out once a week. Don't keep it too warm. I think 78-82 is a sweet spot. Anything higher they get lazy from what I observed.
I honestly never had a problem getting what I needed when I needed it when stuck by this. If theres one thing you do just use 6f. Nursing mothers seem to benefit from it more then compared to dog food.