there's a new tofu called Black Bean tofu, and it has about 30% protein in it. A block costs about 2.19 usually located at the produce section of the grocery store. I hadn't thought of flax seed, but that costs way more than tofu. I did buy a bag of mixed beans so maybe I'll boil those up and give them to them, but I noticed they had GMO's in them, so I haven't used them. I don't like the idea of using catfood or meats. I have organic birds and also they are GMO free and I am trying to find the best of both worlds here. I suppose I could do some sort of fish, but would have to go to the market and figure that out. Their organic feed is about 17% protein. I also feed them Kale as a source of Calcium and Vitamin C
If you are referring to Nasoya, a black soybean tofu, it is still only 9.4% protein (one 85g portion has 8g of protein). Are you looking at the DV? That's still only 16%. As far as costs:
1 12 oz Nasoya cost $2.19
12 oz = 336g
each block has 31.6g of protein
each g of protein costs $.07
Sunflower seeds are about 30% protein
Cost is about $2.50/# in the bird section of your petstore. Cheaper when bought at the feed store.
1# of BOSS has 136g of protein (454x.30)
Each g of protein costs $ .018
Flax seeds are about 21% protein
Animal grade flax runs me $36/50# bag at the feed store.
1# costs me $.72
Each g of protein costs $.008
If you buy human grade flaxseed your costs are $2.25/# (Costco has ground organic flax for $9/4#) and your costs will be $.024 per g or still one third the cost of Nasoya.
Fish will be in the 26% range. You can give them a can of tuna, sardines or trimmings from a meal.
Animal grade roasted soybeans are still cheaper (lower cost plus higher protein) but you will not find one that is non GMO.
I know we're not talking a huge $$ savings based on the quantity that is fed but your tofu is still lower in protein than the layer feed so you are in essence pulling down the overall protein content by feeding the tofu. You need to be looking for something higher than the 17%.