Note: I've edited my post here because I've changed my approach... Lupins are widely suggested to be safe up to 30% but I've found they simply aren't. Hope nobody followed my lead!
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What a terrific thread.
This is my layer mix. Birds are currently laying very well.
Wheat sprouted 50%
Corn sprouted 7%
Peas sprouted 5%
Meat meal 5%
Soy meal 5%
Lupins cracked 8% NO: I no longer add lupins. I'm about to start adding home-cooked whole soy instead (at about 10%).
Lucerne chaff soaked in molasses water 10%
Black sunflower 5%
Shell grit 4%
Molasses 0.5%
Brewers yeast 0.45%
Seaweed meal 0.05%
I sprout the wheat, corn and peas by first soaking for 24 hours in a very large bucket of water (about three quarters water to grain), then hang in a big shadecloth bag, and use them up over the next couple of days.
Soaking the chaff in molasses water is the best way to make it attractive to chickens. About a tablespoon of molasses per a quarter bucket of chaff, water to the top of the chaff only, soak for 20 mins.
I've been experimenting with this mix for about a year. Earlier on I used to use 60% wheat, even 70%, and 10% corn, but I felt the protein content was just too low, because production suffered. Over the year I've gradually increased protein and found better sources. As a result I now have top production and nicely fleshed but not overly fat birds (including the basic commercial layer hybrids, which are usually quite scrawny). My feeling is that most website claims about how sprouting increases protein content are a little exaggerated (and some wildly, such as the one that suggested protein goes up by 300%).
I'm not sure if you have lupins (or if they have the same name) over there, but they're a common feed here in Australia, with similar protein to soy. Not to be confused with the lupin bean which is toxic unless well cooked. Lupins for stock feed have been bred to be low in anti-nutritional factors and are reasonably palatable, but chickens often refuse them at first, so I give them a douse in molasses water along with the lucerne. Anyway it's going very well, even with the commercial hybrids.
Regards
Erica