I am going to start selling my duck eggs this summer at a local farmers market. One of my girls seems to be sensitive to older feed. Anytime I buy feed in bulk I get blood spot eggs as I am working my way through the bottom of the last bag of feed. I check the feed every time I feed the ducks, I have not seen any mold, mildew, excessive dust and the feed smells good. But after the last few times that this occurred I don’t think it’s a coincidence. I have started buying less feed at a time (more trips to the feed store grrrr…) I rarely see bloodspots in the eggs anymore. However, I would feel better selling the eggs if I could check them first. My parent’s friends were telling me that they candle their chicken eggs for bloodspots before they sell them. Does anyone know what to look for or have pics of an egg being candled that had a bloodspot? The spots are generally pretty little so I don’t know if it will show up or not. We are going to candle each egg before we crack it open when we are cooking to try to see if we notice anything out of the ordinary, however a picture would speed up my learning curve. Thanks in advance for your help!