Understand this is just my opinion. I'm sure there will be someone who reads this and says, 'I do it just the opposite and it worked for me.'
What I'm giving you is what I have personal encountered.
Malays need to develop slowly. Not to much protein. They also do much better in a large run (say 1/2 acre or more) or totally free-range. The problem is not with the females but the males.
Requirements for raising the males (as I see it):
1. Plenty of access to grass.
2. Plenty of area to run and develop leg muscles.
3. Not to much protein.
4. Plenty of sunshine.
All right - here is my setting, tell me what I might do to prepare:
I have 42 acres. East is frontage road then highway, North is neighbor a mile away, West is 600+ acres of State-owned land leased by a cattle rancher, South is neighbor a few hundred yards away where so far chickens have never ranged but if they do there is no fence. South Neighbor has no animals I have been able to detect. Almost all our acreage is North of the house and outbuildings, we have made essentially no use of it to date (been here 7 years). It is VERY dry here. Sun is out 300+ days per year. Summer tops 100 degrees for at least two weeks, Winter dips below freezing around the clock about the same (2 weeks per year sequentially). Native predators include Coyote, Owl, Hawk, Prairie Falcon, loose dog occasionally, Raccoon, Rattlesnake, Bull Snake, and the usual assortment of parasites and rodents periodically make their presence known. Regular visitors include pigeons, cottontails and antelope/pronghorn. I am told wild turkey frequent acreage not far from us but we have never seen them, we do occasionally see blue scale quail. At this time I have a 12x16 coop divided into 4 pens and an aisle, a 4x8 coop, and a 3x4 coop, all occupied, and a 24x36 barn occupied by stuff and a broken down van I plan to move out of the barn and turn into a coop. Resources are limited at this time, but we have been known to be creative/inventive when needed. With all this land and sun, it seems I should be able to create the proper infrastructure for Malays as I develop my poultry skills further. What will I need to do to maximize success? Sturdy fencing and coops? Grass is all prairie grass, will it suffice?