your seeds look good, so only three reasons I can think of - 1, room temp low, 2. seed quality, 3, not rinsing enough??...
I agree. Probably not good seed quality. I bought some wheat from a local feedstore. Got the cheaper one. It does not sprout nearly as well as the barley I got from a different source. I have to throw away a lot of the floating debris and the rinse water is nasty. The barley is so clean, nothing floats and the rinse water is clear from the get-go. The barley grows nice and thick. My wheat does not have a good germination rate. I will not use that brand of wheat next time. I also like to change things up sometimes and use wild bird seed (with lots of Black Oiled Sunflower seeds) The chickens seem to love that, too!
I would also like to say, my chickens seem to love love love the wheat seeds that don't germinate as much as they do the green that does grow!